有多少科班毕业的不知道 a+=a-=a*a 是UB？

hnynes

回复 119# pmerofc


突然发现我又XX了一回,跟一白痴在这掐,有意思吗?撤......

shan_ghost

似乎又有人送上门给pmerofc调戏了？搬个小凳子看戏

hnynes

pmerofc 发表于 2013-02-21 17:29
狗屁不通被拆穿就开始恼羞成怒口不择言

你认为你是比得过马化腾,还是比得过周鸿祎呢?  牛啥呀,有种你给整出个像样点的产品啊,在这牛有个鸟用,不想与你这种人浪费时间罢了. 你认为你什么都通,那你也说说你的名号,让我们来膜拜一下,定义与定理的区别是什么都不知道,还在这牛X啥呀.   你见过哪个老外像你这样,拿了一个没有人愿意理会的问题,在一个非常有名的论坛大放XX.  也只有你会觉得有意思吧.

hnynes

UB的各种情况给你弄过来了,你找出支持你的论据来吧.

J.2 Undefined behavior
1 The behavior is undefined in the following circumstances:
— A ‘‘shall’’ or ‘‘shall not’’ requirement that appears outside of a constraint is violated
(clause 4).
— A nonempty source file does not end in a new-line character which is not immediately
preceded by a backslash character or ends in a partial preprocessing token or
comment (5.1.1.2).
— Token concatenation produces a character sequence matching the syntax of a
universal character name (5.1.1.2).
— A program in a hosted environment does not define a function namedmainusing one
of the specified forms (5.1.2.2.1).
— A character not in the basic source character set is encountered in a source file, except
in an identifier, a character constant, a string literal, a header name, a comment, or a
preprocessing token that is never converted to a token (5.2.1).
— An identifier, comment, string literal, character constant, or header name contains an
invalid multibyte character or does not begin and end in the initial shift state (5.2.1.2).
— The same identifier has both internal and external linkage in the same translation unit
(6.2.2).
— An object is referred to outside of its lifetime (6.2.4).
— The value of a pointer to an object whose lifetime has ended is used (6.2.4).
— The value of an object with automatic storage duration is used while it is
indeterminate (6.2.4, 6.7.8, 6..
— A trap representation is read by an lvalue expression that does not have character type
(6.2.6.1).
— A trap representation is produced by a side effect that modifies any part of the object
using an lvalue expression that does not have character type (6.2.6.1).
— The arguments to certain operators are such that could produce a negative zero result,
but the implementation does not support negative zeros (6.2.6.2).
— Two declarations of the same object or function specify types that are not compatible
(6.2.7).
— Conversion to or from an integer type produces a value outside the range that can be
represented (6.3.1.4).
— Demotion of one real floating type to another produces a value outside the range that
can be represented (6.3.1.5).
— An lvalue does not designate an object when evaluated (6.3.2.1).
— A non-array lvalue with an incomplete type is used in a context that requires the value
of the designated object (6.3.2.1).
— An lvalue having array type is converted to a pointer to the initial element of the
array, and the array object has register storage class (6.3.2.1).
— An attempt is made to use the value of a void expression, or an implicit or explicit
conversion (except tovoid) is applied to a void expression (6.3.2.2).
— Conversion of a pointer to an integer type produces a value outside the range that can
be represented (6.3.2.3).
— Conversion between two pointer types produces a result that is incorrectly aligned
(6.3.2.3).
— A pointer is used to call a function whose type is not compatible with the pointed-to
type (6.3.2.3).
— An unmatched'or "character is encountered on a logical source line during
tokenization (6.4).
— A reserved keyword token is used in translation phase 7 or 8 for some purpose other
than as a keyword (6.4.1).
— A universal character name in an identifier does not designate a character whose
encoding falls into one of the specified ranges (6.4.2.1).
— The initial character of an identifier is a universal character name designating a digit
(6.4.2.1).
— Two identifiers differ only in nonsignificant characters (6.4.2.1).
— The identifier__func_ _is explicitly declared (6.4.2.2).
— The program attempts to modify a string literal (6.4.5).
— The characters', \, ", //,or/*occur in the sequence between the<and >
delimiters, or the characters', \, //,or/*occur in the sequence between the"
delimiters, in a header name preprocessing token (6.4.7).
— Between two sequence points, an object is modified more than once, or is modified
and the prior value is read other than to determine the value to be stored (6.5).
— An exceptional condition occurs during the evaluation of an expression (6.5).
— An object has its stored value accessed other than by an lvalue of an allowable type
(6.5).
— An attempt is made to modify the result of a function call, a conditional operator, an
assignment operator, or a comma operator, or to access it after the next sequence
point (6.5.2.2, 6.5.15, 6.5.16, 6.5.17).
— For a call to a function without a function prototype in scope, the number of
arguments does not equal the number of parameters (6.5.2.2).
— For call to a function without a function prototype in scope where the function is
defined with a function prototype, either the prototype ends with an ellipsis or the
types of the arguments after promotion are not compatible with the types of the
parameters (6.5.2.2).
— For a call to a function without a function prototype in scope where the function is not
defines with a function prototype, the types of the arguments after promotion are not
compatible with those of the parameters after promotion (with certain exceptions)
(6.5.2.2).
— A function is defined with a type that is not compatible with the type (of the
expression) pointed to by the expression that denotes the called function (6.5.2.2).
— The operand of the unary*operator has an invalid value (6.5.3.2).
— A pointer is converted to other than an integer or pointer type (6.5.4).
— The value of the second operand of the/or%operator is zero (6.5.5).
— Addition or subtraction of a pointer into, or just beyond, an array object and an
integer type produces a result that does not point into, or just beyond, the same array
object (6.5.6).
— Addition or subtraction of a pointer into, or just beyond, an array object and an
integer type produces a result that points just beyond the array object and is used as
the operand of a unary*operator that is evaluated (6.5.6).
— Pointers that do not point into, or just beyond, the same array object are subtracted
(6.5.6).
— An array subscript is out of range, even if an object is apparently accessible with the
given subscript (as in the lvalue expressiona[1][7]given the declarationint
a[4][5]) (6.5.6).
— The result of subtracting two pointers is not representable in an object of type
ptrdiff_t(6.5.6).
— An expression is shifted by a negative number or by an amount greater than or equal
to the width of the promoted expression (6.5.7).
— An expression having signed promoted type is left-shifted and either the value of the
expression is negative or the result of shifting would be not be representable in the
promoted type (6.5.7).
— Pointers that do not point to the same aggregate or union (nor just beyond the same
array object) are compared using relational operators (6.5..
— An object is assigned to an inexactly overlapping object or to an exactly overlapping
object with incompatible type (6.5.16.1).
— An expression that is required to be an integer constant expression does not have an
integer type; has operands that are not integer constants, enumeration constants,
character constants, sizeofexpressions whose results are integer constants, or
immediately-cast floating constants; or contains casts (outside operands to sizeof
operators) other than conversions of arithmetic types to integer types (6.6).
— A constant expression in an initializer is not, or does not evaluate to, one of the
following: an arithmetic constant expression, a null pointer constant, an address
constant, or an address constant for an object type plus or minus an integer constant
expression (6.6).
— An arithmetic constant expression does not have arithmetic type; has operands that
are not integer constants, floating constants, enumeration constants, character
constants, orsizeofexpressions; or contains casts (outside operands tosizeof
operators) other than conversions of arithmetic types to arithmetic types, (6.6).
— The value of an object is accessed by an array-subscript[], member-access .or?>,
address&, or indirection *operator or a pointer cast in creating an address constant
(6.6).
— An identifier for an object is declared with no linkage and the type of the object is
incomplete after its declarator, or after its init-declarator if it has an initializer (6.7).
— A function is declared at block scope with an explicit storage-class specifier other
thanextern(6.7.1).
— A structure or union is defined as containing no named members (6.7.2.1).
— An attempt is made to access, or generate a pointer to just past, a flexible array
member of a structure when the referenced object provides no elements for that array
(6.7.2.1).
— When the complete type is needed, an incomplete structure or union type is not
completed in the same scope by another declaration of the tag that defines the content
(6.7.2.3).
— An attempt is made to modify an object defined with a const-qualified type through
use of an lvalue with non-const-qualified type (6.7.3).
— An attempt is made to refer to an object defined with a volatile-qualified type through
use of an lvalue with non-volatile-qualified type (6.7.3).
— The specification of a function type includes any type qualifiers (6.7.3).
— Two qualified types that are required to be compatible do not have the identically
qualified version of a compatible type (6.7.3).
— An object which has been modified is accessed through a restrict-qualified pointer to
a const-qualified type, or through a restrict-qualified pointer and another pointer that
are not both based on the same object (6.7.3.1).
— A restrict-qualified pointer is assigned a value based on another restricted pointer
whose associated block neither began execution before the block associated with this
pointer, nor ended before the assignment (6.7.3.1).
— A function with external linkage is declared with aninlinefunction specifier, but is
not also defined in the same translation unit (6.7.4).
— Two pointer types that are required to be compatible are not identically qualified, or
are not pointers to compatible types (6.7.5.1).
— The size expression in an array declaration is not a constant expression and evaluates
at program execution time to a nonpositive value (6.7.5.2).
— In a context requiring two array types to be compatible, they do not have compatible
element types, or their size specifiers evaluate to unequal values (6.7.5.2).
— A declaration of an array parameter includes the keywordstaticwithin the[and
]and the corresponding argument does not provide access to the first element of an
array with at least the specified number of elements (6.7.5.3).
— A storage-class specifier or type qualifier modifies the keywordvoidas a function
parameter type list (6.7.5.3).
— In a context requiring two function types to be compatible, they do not have
compatible return types, or their parameters disagree in use of the ellipsis terminator
or the number and type of parameters (after default argument promotion, when there
is no parameter type list or when one type is specified by a function definition with an
identifier list) (6.7.5.3).
— The value of an unnamed member of a structure or union is used (6.7..
— The initializer for a scalar is neither a single expression nor a single expression
enclosed in braces (6.7..
— The initializer for a structure or union object that has automatic storage duration is
neither an initializer list nor a single expression that has compatible structure or union
type (6.7..
— The initializer for an aggregate or union, other than an array initialized by a string
literal, is not a brace-enclosed list of initializers for its elements or members (6.7..
— An identifier with external linkage is used, but in the program there does not exist
exactly one external definition for the identifier, or the identifier is not used and there
exist multiple external definitions for the identifier (6.9).
— A function definition includes an identifier list, but the types of the parameters are not
declared in a following declaration list (6.9.1).
— An adjusted parameter type in a function definition is not an object type (6.9.1).
— A function that accepts a variable number of arguments is defined without a
parameter type list that ends with the ellipsis notation (6.9.1).
— The}that terminates a function is reached, and the value of the function call is used
by the caller (6.9.1).
— An identifier for an object with internal linkage and an incomplete type is declared
with a tentative definition (6.9.2).
— The tokendefinedis generated during the expansion of a #ifor #elif
preprocessing directive, or the use of thedefinedunary operator does not match
one of the two specified forms prior to macro replacement (6.10.1).
— The#includepreprocessing directive that results after expansion does not match
one of the two header name forms (6.10.2).
— The character sequence in an#includepreprocessing directive does not start with a
letter (6.10.2).
— There are sequences of preprocessing tokens within the list of macro arguments that
would otherwise act as preprocessing directives (6.10.3).
— The result of the preprocessing operator#is not a valid character string literal
(6.10.3.2).
— The result of the preprocessing operator##is not a valid preprocessing token
(6.10.3.3).
— The#linepreprocessing directive that results after expansion does not match one of
the two well-defined forms, or its digit sequence specifies zero or a number greater
than 2147483647 (6.10.4).
— A non-STDC #pragmapreprocessing directive that is documented as causing
translation failure or some other form of undefined behavior is encountered (6.10.6).
—A#pragma STDCpreprocessing directive does not match one of the well-defined
forms (6.10.6).
— The name of a predefined macro, or the identifierdefined, is the subject of a
#defineor#undefpreprocessing directive (6.10..
— An attempt is made to copy an object to an overlapping object by use of a library
function, other than as explicitly allowed (e.g.,memmove) (clause 7).
— A file with the same name as one of the standard headers, not provided as part of the
implementation, is placed in any of the standard places that are searched for included
source files (7.1.2).
— A header is included within an external declaration or definition, (7.1.2).
— A function, object, type, or macro that is specified as being declared or defined by
some standard header is used before any header that declares or defines it is included
(7.1.2).
— A standard header is included while a macro is defined with the same name as a
keyword (7.1.2).
— The program attempts to declare a library function itself, rather than via a standard
header, but the declaration does not have external linkage (7.1.2).
— The program declares or defines a reserved identifier, other than as allowed by 7.1.4
(7.1.3).

hnynes

一帖发不完,只能帖两次
— The program removes the definition of a macro whose name begins with an
underscore and either an uppercase letter or another underscore (7.1.3).
— An argument to a library function has an invalid value or a type not expected by a
function with variable number of arguments (7.1.4).
— The pointer passed to a library function array parameter does not have a value such
that all address computations and object accesses are valid (7.1.4).
— The macro definition ofassertis suppressed in order to access an actual function
(7.2).
— The argument to theassertmacro does not have a scalar type (7.2).
— TheCX_LIMITED_RANGE, FENV_ACCESS,orFP_CONTRACTpragma is used in
any context other than outside all external declarations or preceding all explicit
declarations and statements inside a compound statement (7.3.4, 7.6.1, 7.12.2).
— The value of an argument to a character handling function is neither equal to the value
ofEOFnor representable as anunsigned char(7.4).
— A macro definition oferrnois suppressed in order to access an actual object, or the
program defines an identifier with the nameerrno(7.5).
— Part of the program tests floating-point status flags, sets floating-point control modes,
or runs under non-default mode settings, but was translated with the state for the
FENV_ACCESSpragma ‘‘off’’ (7.6.1).
— The exception-mask argument for one of the functions that provide access to the
floating-point status flags has a nonzero value not obtained by bitwiseORof the
floating-point exception macros (7.6.2).
— Thefesetexceptflagfunction is used to set floating-point status flags that were
not specified in the call to thefegetexceptflagfunction that provided the value
of the correspondingfexcept_tobject (7.6.2.4). The argument tofesetenvor
feupdateenvis neither an object set by a call tofegetenvorfeholdexcept,
nor is it an environment macro (7.6.4.3, 7.6.4.4).
— The value of the result of an integer arithmetic or conversion function cannot be
represented (7.8.2.1, 7.8.2.2, 7.8.2.3, 7.8.2.4, 7.20.6.1, 7.20.6.2, 7.20.1).
— The program modifies the string pointed to by the value returned by thesetlocale
function (7.11.1.1).
— The program modifies the structure pointed to by the value returned by the
localeconvfunction (7.11.2.1).
— A macro definition ofmath_errhandlingis suppressed or the program defines
an identifier with the namemath_errhandling(7.12).
— An argument to a floating-point classification or comparison macro is not of real
floating type (7.12.3, 7.12.14).
— A macro definition ofsetjmpis suppressed in order to access an actual function, or
the program defines an external identifier with the namesetjmp(7.13.1).
— An inv ocation of thesetjmpmacro occurs other than in an allowed context
(7.13.2.1).
— Thelongjmpfunction is invoked to restore a nonexistent environment (7.13.2.1).
— After alongjmp, there is an attempt to access the value of an object of automatic
storage class with non-volatile-qualified type, local to the function containing the
invocation of the corresponding setjmpmacro, that was changed between the
setjmpinvocation andlongjmpcall (7.13.2.1).
— The program specifies an invalid pointer to a signal handler function (7.14.1.1).
— A signal handler returns when the signal corresponded to a computational exception
(7.14.1.1).
— A signal occurs as the result of calling theabortorraisefunction, and the signal
handler calls theraisefunction (7.14.1.1).
— A signal occurs other than as the result of calling theabortorraisefunction, and
the signal handler refers to an object with static storage duration other than by
assigning a value to an object declared asvolatile sig_atomic_t, or calls any
function in the standard library other than theabortfunction, the_Exitfunction,
or thesignalfunction (for the same signal number), (7.14.1.1).
— The value oferrnois referred to after a signal occurred other than as the result of
calling theabortorraisefunction and the corresponding signal handler obtained
aSIG_ERRreturn from a call to thesignalfunction (7.14.1.1).
— A signal is generated by an asynchronous signal handler (7.14.1.1).
— A function with a variable number of arguments attempts to access its varying
arguments other than through a properly declared and initializedva_listobject, or
before theva_startmacro is invoked (7.15, 7.15.1.1, 7.15.1.4).
— The macrova_argis invoked using the parameter apthat was passed to a function
that invoked the macrova_argwith the same parameter (7.15).
— A macro definition ofva_start, va_arg, va_copy,orva_endis suppressed in
order to access an actual function, or the program defines an external identifier with
the nameva_end(7.15.1).
— Theva_startorva_copymacro is invoked without a corresponding invocation
of theva_endmacro in the same function, or vice versa (7.15.1, 7.15.1.2, 7.15.1.3,
7.15.1.4).
— The type parameter to theva_argmacro is not such that a pointer to an object of
that type can be obtained simply by postfixing a*(7.15.1.1).
— Theva_argmacro is invoked when there is no actual next argument, or with a
specified type that is not compatible with the promoted type of the actual next
argument, with certain exceptions (7.15.1.1).
— Theva_copyorva_startmacro is called to initialize ava_listthat was
previously initialized by either macro without an intervening invocation of the
va_endmacro for the sameva_list(7.15.1.2, 7.15.1.4).
— The parameterparmN of a va_startmacro is declared with theregister
storage class, with a function or array type, or with a type that is not compatible with
the type that results after application of the default argument promotions (7.15.1.4).
— The member designator parameter of anoffsetofmacro is an invalid right
operand of the.operator for thetypeparameter, or designates a bit-field (7.17).
— The argument in an instance of one of the integer-constant macros is not a decimal,
octal, or hexadecimal constant, or it has a value that exceeds the limits for the
corresponding type (7.18.4).
— A byte input/output function is applied to a wide-oriented stream, or a wide character
input/output function is applied to a byte-oriented stream (7.19.2).
— Use is made of any portion of a file beyond the most recent wide character written to
a wide-oriented stream (7.19.2).
— The value of a pointer to aFILEobject is used after the associated file is closed
(7.19.3).
— The stream for thefflushfunction points to an input stream or to an update stream
in which the most recent operation was input (7.19.5.2).
— The string pointed to by themodeargument in a call to thefopenfunction does not
exactly match one of the specified character sequences (7.19.5.3).
— An output operation on an update stream is followed by an input operation without an
intervening call to the fflushfunction or a file positioning function, or an input
operation on an update stream is followed by an output operation with an intervening
call to a file positioning function (7.19.5.3).
— An attempt is made to use the contents of the array that was supplied in a call to the
setvbuffunction (7.19.5.6).
— There are insufficient arguments for the format in a call to one of the formatted
input/output functions, or an argument does not have an appropriate type (7.19.6.1,
7.19.6.2, 7.24.2.1, 7.24.2.2).
— The format in a call to one of the formatted input/output functions or to the
strftimeorwcsftimefunction is not a valid multibyte character sequence that
begins and ends in its initial shift state (7.19.6.1, 7.19.6.2, 7.23.3.5, 7.24.2.1, 7.24.2.2,
7.24.5.1).
— In a call to one of the formatted output functions, a precision appears with a
conversion specifier other than those described (7.19.6.1, 7.24.2.1).
— A conversion specification for a formatted output function uses an asterisk to denote
an argument-supplied field width or precision, but the corresponding argument is not
provided (7.19.6.1, 7.24.2.1).
— A conversion specification for a formatted output function uses a#or0flag with a
conversion specifier other than those described (7.19.6.1, 7.24.2.1).
— A conversion specification for one of the formatted input/output functions uses a
length modifier with a conversion specifier other than those described (7.19.6.1,
7.19.6.2, 7.24.2.1, 7.24.2.2).
—Ansconversion specifier is encountered by one of the formatted output functions,
and the argument is missing the null terminator (unless a precision is specified that
does not require null termination) (7.19.6.1, 7.24.2.1).
—Annconversion specification for one of the formatted input/output functions includes
any flags, an assignment-suppressing character, a field width, or a precision (7.19.6.1,
7.19.6.2, 7.24.2.1, 7.24.2.2).
—A% conversion specifier is encountered by one of the formatted input/output
functions, but the complete conversion specification is not exactly %%(7.19.6.1,
7.19.6.2, 7.24.2.1, 7.24.2.2).
— An inv alid conversion specification is found in the format for one of the formatted
input/output functions, or thestrftimeorwcsftimefunction (7.19.6.1, 7.19.6.2,
7.23.3.5, 7.24.2.1, 7.24.2.2, 7.24.5.1).
— The number of characters transmitted by a formatted output function is greater than
INT_MAX(7.19.6.1, 7.19.6.3, 7.19.6.8, 7.19.6.10).
— The result of a conversion by one of the formatted input functions cannot be
represented in the corresponding object, or the receiving object does not have an
appropriate type (7.19.6.2, 7.24.2.2).
—Ac, s,or[conversion specifier is encountered by one of the formatted input
functions, and the array pointed to by the corresponding argument is not large enough
to accept the input sequence (and a null terminator if the conversion specifier is sor
[) (7.19.6.2, 7.24.2.2).
—Ac, s,or[conversion specifier with anlqualifier is encountered by one of the
formatted input functions, but the input is not a valid multibyte character sequence
that begins in the initial shift state (7.19.6.2, 7.24.2.2).
— The input item for a%pconversion by one of the formatted input functions is not a
value converted earlier during the same program execution (7.19.6.2, 7.24.2.2).
— Thevfprintf, vfscanf, vprintf, vscanf, vsnprintf, vsprintf,
vsscanf, vfwprintf, vfwscanf, vswprintf, vswscanf, vwprintf,or
vwscanffunction is called with an improperly initialized va_listargument, or
the argument is used (other than in an invocation of va_end) after the function
returns (7.19.6.8, 7.19.6.9, 7.19.6.10, 7.19.6.11, 7.19.6.12, 7.19.6.13, 7.19.6.14,
7.24.2.5, 7.24.2.6, 7.24.2.7, 7.24.2.8, 7.24.2.9, 7.24.2.10).
— The contents of the array supplied in a call to thefgets, gets,orfgetwsfunction
are used after a read error occurred (7.19.7.2, 7.19.7.7, 7.24.3.2).
— The file position indicator for a binary stream is used after a call to theungetc
function where its value was zero before the call (7.19.7.11).
— The file position indicator for a stream is used after an error occurred during a call to
thefreadorfwritefunction (7.19.8.1, 7.19.8.2).
— A partial element read by a call to thefreadfunction is used (7.19.8.1).
— Thefseekfunction is called for a text stream with a nonzero offset and either the
offset was not returned by a previous successful call to theftellfunction on a
stream associated with the same file orwhenceis notSEEK_SET(7.19.9.2).
— Thefsetposfunction is called to set a position that was not returned by a previous
successful call to thefgetposfunction on a stream associated with the same file
(7.19.9.3).
— A non-null pointer returned by a call to thecalloc, malloc,orreallocfunction
with a zero requested size is used to access an object (7.20.3).
— The value of a pointer that refers to space deallocated by a call to thefreeor
reallocfunction is used (7.20.3).
— The pointer argument to thefreeorreallocfunction does not match a pointer
earlier returned by calloc, malloc,orrealloc, or the space has been
deallocated by a call tofreeorrealloc(7.20.3.2, 7.20.3.4).
— The value of the object allocated by themallocfunction is used (7.20.3.3).
— The value of any bytes in a new object allocated by thereallocfunction beyond
the size of the old object are used (7.20.3.4).
— The program executes more than one call to theexitfunction (7.20.4.3).
— During the call to a function registered with theatexitfunction, a call is made to
the longjmpfunction that would terminate the call to the registered function
(7.20.4.3).
— The string set up by thegetenvorstrerrorfunction is modified by the program
(7.20.4.5, 7.21.6.2).
— A command is executed through thesystemfunction in a way that is documented as
causing termination or some other form of undefined behavior (7.20.4.6).
— A searching or sorting utility function is called with an invalid pointer argument, even
if the number of elements is zero (7.20.5).
— The comparison function called by a searching or sorting utility function alters the
contents of the array being searched or sorted, or returns ordering values
inconsistently (7.20.5).
— The array being searched by thebsearchfunction does not have its elements in
proper order (7.20.5.1).
— The current conversion state is used by a multibyte/wide character conversion
function after changing theLC_CTYPEcategory (7.20.7).
— A string or wide string utility function is instructed to access an array beyond the end
of an object (7.21.1, 7.24.4).
— A string or wide string utility function is called with an invalid pointer argument, even
if the length is zero (7.21.1, 7.24.4).
— The contents of the destination array are used after a call to thestrxfrm,
strftime, wcsxfrm,orwcsftimefunction in which the specified length was
too small to hold the entire null-terminated result (7.21.4.5, 7.23.3.5, 7.24.4.4.4,
7.24.5.1).
— The first argument in the very first call to thestrtokorwcstokis a null pointer
(7.21.5.8, 7.24.4.5.7).
— The type of an argument to a type-generic macro is not compatible with the type of
the corresponding parameter of the selected function (7.22).
— A complex argument is supplied for a generic parameter of a type-generic macro that
has no corresponding complex function (7.22).
— The argument corresponding to ansspecifier without anlqualifier in a call to the
fwprintffunction does not point to a valid multibyte character sequence that
begins in the initial shift state (7.24.2.11).
— In a call to thewcstokfunction, the object pointed to by ptrdoes not have the
value stored by the previous call for the same wide string (7.24.4.5.7).
—Anmbstate_tobject is used inappropriately (7.24.6).
— The value of an argument of typewint_tto a wide character classification or case
mapping function is neither equal to the value ofWEOFnor representable as a
wchar_t(7.25.1).
— Theiswctypefunction is called using a different LC_CTYPEcategory from the
one in effect for the call to the wctypefunction that returned the description
(7.25.2.2.1).
— Thetowctransfunction is called using a different LC_CTYPEcategory from the
one in effect for the call to thewctransfunction that returned the description
(7.25.3.2.1).

starwing83

回复 126# hnynes


    你跟商人比技术？你跟程序员提产品？你确定你找对了对象么？

跟商人谈市场
跟营销谈产品
跟程序员谈技术

starwing83

回复 127# hnynes


    就在你这个帖子的1/3处：

— Between two sequence points, an object is modified more than once, or is modified
and the prior value is read other than to determine the value to be stored (6.5).