Compilare: main.cpp: In function 'int main()': main.cpp:77:47: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ( "mexitate.out" , "w" , stdout ) ; ^ main.cpp: In function 'char getch(FILE*)': main.cpp:20:62: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread ( buffer + 1 , 1 , BUFFER_SIZE , f ) , poz = 0 ; ^ main.cpp: In function 'int eval()': main.cpp:71:1: warning: control reaches end of non-void function [-Wreturn-type] } ^