Compilare: user.c: In function ‘main’: user.c:25:23: warning: variable ‘s’ set but not used [-Wunused-but-set-variable] int a,b,aa,bb,r,i,s,cmmmc,j; ^ user.c:26:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("multiplu.in","r",stdin); ^ user.c:27:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("multiplu.out","w",stdout); ^ user.c:28:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&a,&b); ^