Compilare: user.cpp: In function ‘long int op(long int, long int, char)’: user.cpp:14:5: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:34:52: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(s, 100010, fopen("evaluare.in", "r")); ^