Compilare: user.cpp: In function ‘int main()’: user.cpp:11:9: warning: unused variable ‘n’ [-Wunused-variable] int n,k,a; ^ user.cpp:11:11: warning: unused variable ‘k’ [-Wunused-variable] int n,k,a; ^ user.cpp:11:13: warning: unused variable ‘a’ [-Wunused-variable] int n,k,a; ^ user.cpp:9:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("divprim.in", "r", stdin); ^ user.cpp:10:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("divprim.out", "w", stdout); ^ user.cpp:34:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &t); ^ user.cpp:37:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &k); ^