求助，输入结束不能，输入和输出的顺序颠倒

hbr1234stc

列表输入结束不能，windows系统，ctrl+z无效，回车ctrl+z回车也无效，ctrl+abcdefg...xyz都不行，求大神告知怎么办
还有一个问题，代码里面有输入的时候，前面的print的内容不显示，要在输入结束之后才一起显示，请问是什么问题，比如：
print"a=";
$a=<STDIN>;
print"b=";
$b=<STDIN>;
print"a+b=".($a+$b);

本来应该是a=1
              b=1
              a+b=2
但是运行的时候先让我输入，就成了1
                                             1
                                             a=b=a+b=2

jason680

回复 1# hbr1234stc

$ perl in.pl
a=1
b=1
a+b=2


$ cat in.pl
use strict;
use warnings;

$| = 1;
print "a=";
my $sA = <STDIN>;
print "b=";
my $sB = <STDIN>;
print "a+b=" . ($sA + $sB) . "\n";




$ perldoc perlvar
NAME
    perlvar - Perl predefined variables

DESCRIPTION
  The Syntax of Variable Names
    Variable names in Perl can have several formats. Usually, they must begin
    with a letter or underscore, in which case they can be arbitrarily long
    (up to an internal limit of 251 characters) and may contain letters,
    digits, underscores, or the special sequence "::" or "'". In this case,
    the part before the last "::" or "'" is taken to be a package qualifier
    see perlmod.

    ...

    HANDLE->autoflush( EXPR )
    $OUTPUT_AUTOFLUSH
    $|      If set to nonzero, forces a flush right away and after every write
            or print on the currently selected output channel. Default is 0
            (regardless of whether the channel is really buffered by the
            system or not; $| tells you only whether you've asked Perl
            explicitly to flush after each write). STDOUT will typically be
            line buffered if output is to the terminal and block buffered
            otherwise. Setting this variable is useful primarily when you are
            outputting to a pipe or socket, such as when you are running a
            Perl program under rsh and want to see the output as it's
            happening. This has no effect on input buffering. See "getc" in
            perlfunc for that. See "select" in perlfunc on how to select the
            output channel. See also IO::Handle.

            Mnemonic: when you want your pipes to be piping hot.

hbr1234stc

回复 2# jason680

感谢回复这么多，但是我没看懂……我是初学者，能不能麻烦稍微用中文解释下？
   

guo__qiu

输出的数据不会放在输出缓冲去里，直接输出