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thank you

Hi
The following is my program to test popen()
routine. The purpose is to print some contents
of the corrent directory.
But in fact, the output is only one character
'a', which I believe is the...

Hi
I'm using Linux, in the directory /root/my
there is a.out. but when I try to run it , the
shell indicate "bash:a.out: command not found"
but I AM working in this directory. if I use...

in

fprint(stderr, "lkjalsdi\n");


what does stderr mean?

thanks

what does for( ; ; ) mean?

thanks

thanks

for example, the string a is "abcdefg", can i get a substring "bcd" (from a[1]to a[3]) from string a?

thank you

how to write a program that receive a string from keyboard and then print it out. i write a program:
main()
{
char str[80];
gets(str);
printf(str);
}
but when i compile it, the system said...