Compilare: user.cpp: In function ‘int main()’: user.cpp:43:13: warning: unused variable ‘i’ [-Wunused-variable] int i, j, div; ^ user.cpp:43:16: warning: unused variable ‘j’ [-Wunused-variable] int i, j, div; ^ user.cpp:44:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("difprim.in","r",stdin); ^ user.cpp:45:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("difprim.out","w",stdout); ^ user.cpp:47:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &A, &B); ^ user.cpp:43:19: warning: ‘div’ is used uninitialized in this function [-Wuninitialized] int i, j, div; ^