苦思冥想，关于【指针类型强制转换】的问题，求解！

folklore

printf(, *((char *)&a));
pls use printf("%c\n",

assume there are the following code
char [1111]="%x\n";
printf(fmthex,*((char *)&a));
fmthex[1]='c';
printf(fmthex,*((char *)&a));

now you may understand what happy: the compiler doesn't know which type be transport into the function "printf";
which is parsed by the function "printf" itself. and the compiler can't (some compiler can do a few check about function printf & scanf)
understand what happen about the first parameter of printf( which be understand as a formating string).
while use printf, it is your duty to make the program acts right.

wish it helps, thks

folklore

回复 6# warmofice


    i am sorry i am no chinese input method installed in my pc.

change

1. 
   
2. printf("%x\n", *((char *)&a));
   

复制代码

to

1. 
   
2. printf("%x\n", *((unsigned char *)&a));
   

复制代码

in c, the char be imps as a interger, it lead the problem that you faced.
some compiler imps the char to unsigned char
but others translating it to singed char (just as the one you have);
0xffffffff7 to char= 0xf7
pass f7 as a parament to printf,it will be changed to integer(the wordwidth of your pc).
if you compile this program into a 32 bit machine, the result is 0xfffffff7: it is 32bits
or it may be 0xfffffffffffffff7 in 64 bit prg.

folklore

回复 9# folklore


    if you can't understand, try the following code

1. 
   
2. printf("%x,%x",(char)0xf7,0xf7);
   

复制代码

folklore

回复 11# nilgod


    i7/8g 64bit japanese home pre win7

folklore

回复 13# nilgod


    i don't like to install too many soft in may system. but in actually i am already installed a lot(which is absolutely needed and had to install).

folklore

i am sorry that it lead to a quarrel because of me.
i don't install ch ime because i install a lot of soft, that number (or type) of soft i install may out of your understand(), include cad,ps,vs,ellipse,molism,orcad,postsql,mysql.... etc
the one always crash with others and it is very difficulty to found what happen.

thks warmofice & wait_rabbit  to guard with me.

folklore

回复 77# nilgod

    哈哈，笑死我了，你这些软件多么？

还稀奇古怪，该装的不装，不该装的装一大堆，装逼还差不多，没什么意思。

你也差不多只有这个样子了。

i don't care about you & that what you think with me. it is why i don't reply you.
yes ,it is "装逼", but is it worry with you?
i install the smallest set that i frequelty used.
perhaps my knowlege is out of the range that your can understand, but it is not my wrong.
of course nor you.

folklore

回复 117# wait_rabbit


    don't worry about him, he is crazy.

i am confuse why you reply him.

he can't understand what is human equality. and just try to guess others with evil.

help a newbie seems worry him. with the way we can't understand.

just forgive him and don't reply him again.

folklore

continue to quarrel is just wast time.
it product nothing valuable (except kill time, if you like).
i think it is the time to terminate this issue.