Compilare: user.c: In function ‘cmmdc’: user.c:6:25: warning: left-hand operand of comma expression has no effect [-Wunused-value] if (a>b) return (a-b,b); ^ user.c:7:22: warning: left-hand operand of comma expression has no effect [-Wunused-value] else return (a,b-a); ^ user.c: In function ‘main’: user.c:15:6: warning: format ‘%d’ expects argument of type ‘int *’, but argument 2 has type ‘int’ [-Wformat=] for (scanf("%d", t); t; t--) ^ user.c:12:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("Euclid2","r",stdin); ^ user.c:13:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("Euclid2","w",stdout); ^ user.c:15:16: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] for (scanf("%d", t); t; t--) ^ user.c:17:15: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &a, &b); ^ user.c:15:16: warning: ‘t’ is used uninitialized in this function [-Wuninitialized] for (scanf("%d", t); t; t--) ^