Compilare: user.c: In function ‘main’: user.c:20:11: warning: unused variable ‘g’ [-Wunused-variable] FILE *g=fopen("frac.out", "w"); ^ user.c:19:11: warning: unused variable ‘f’ [-Wunused-variable] FILE *f=fopen("frac.in", "r"); ^ user.c:22:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &p); ^