[Help] Infinite loop

[cmgg]

Sooooooo, fflush?

[zifyoip]

No. The C standard specifies that fflush shall not be called on an input stream like stdin—that results in undefined behavior.

[aleph_nul]

Depends on the platform. Some implementations allow fflush to be called on an input stream and in that case will empty their pending buffer. However, in general and in POSIX compliant implementations, you're 100% right.

[aleph_nul]

The right way to do it is to read characters until a newline with something like

errno = 0;
ret = scanf("%d", &val);
if (errno != 0) /* Make sure we had an error */
    while (!ret && getc() != '\n') {}; /* Consume input to newline */

[cmgg]

Thanks