Compilare: user.c: In function ‘cmmdc’: user.c:8:14: warning: left-hand operand of comma expression has no effect [-Wunused-value] return (a,b%a); ^ user.c: At top level: user.c:11:1: warning: return type defaults to ‘int’ [enabled by default] main() ^ user.c: In function ‘main’: user.c:15:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&a,&b); ^