Compilare: main.cpp: In function 'int main()': main.cpp:73:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("drum4.in","r",stdin); ^ main.cpp:74:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("drum4.out","w",stdout); ^ main.cpp: In function 'char getChar()': main.cpp:13:28: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(BUF,LIM,1,stdin); ^