Compilare: main.cpp: In function 'int calc1(int, int)': main.cpp:30:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ main.cpp: In function 'int calc2(int, int)': main.cpp:49:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ main.cpp: In function 'int main()': main.cpp:52:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("numinum.in","r",stdin); ^ main.cpp:53:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("numinum.out","w",stdout); ^ main.cpp:55:17: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ main.cpp:58:37: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d",&x,&y,&a,&b); ^