Compilare: user.c: In function ‘G’: user.c:22:5: warning: implicit declaration of function ‘isdigit’ [-Wimplicit-function-declaration] while(!isdigit(c)) ^ user.c: In function ‘main’: user.c:34:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("momente.in","r",stdin); ^ user.c:35:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("momente.out","w",stdout); ^