Compilare: user.cpp: In function ‘int cmmmc(int, int)’: user.cpp:16:9: warning: unused variable ‘r’ [-Wunused-variable] int r,ca,cb; ^ user.cpp:16:11: warning: variable ‘ca’ set but not used [-Wunused-but-set-variable] int r,ca,cb; ^ user.cpp:16:14: warning: variable ‘cb’ set but not used [-Wunused-but-set-variable] int r,ca,cb; ^ user.cpp:19:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:22:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("multiplu.in","r",stdin); ^ user.cpp:23:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("multiplu.out","w",stdout); ^ user.cpp:27:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&a,&b); ^