prog.c: In function ‘mult’:
prog.c:7: warning: ‘main’ is normally a non-static function
prog.c:14: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result
prog.c:15: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result
prog.c:16: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result
/usr/lib/gcc/i686-pc-linux-gnu/4.3.4/../../../crt1.o: In function `_start':
(.text+0x18): undefined reference to `main'
collect2: ld returned 1 exit status