Compilare: main.cpp: In function 'int pr(char)': main.cpp:20:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ main.cpp: In function 'int oper(int, int, char)': main.cpp:30:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ main.cpp: In function 'int main()': main.cpp:33:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("evaluare.in","r",stdin); ^ main.cpp:34:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("evaluare.out","w",stdout); ^