Compilare: user.c: In function ‘main’: user.c:61:11: warning: unused variable ‘f2’ [-Wunused-variable] FILE *f1,f2; ^ user.c:61:8: warning: unused variable ‘f1’ [-Wunused-variable] FILE *f1,f2; ^ user.c:62:10: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen ("produs4.in","r",stdin); ^ user.c:63:10: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen ("produs4.out","w",stdout); ^ user.c:66:7: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &nr_teste); ^ user.c:70:8: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &nr_el); ^ user.c:73:9: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &a[j]); ^