Compilare: main.cpp: In function 'char readChar()': main.cpp:17:37: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread( rbuf, 1, BUFSIZE, stdin ); ^ main.cpp: In function 'int main()': main.cpp:31:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ( "secv3.in", "r", stdin ); ^ main.cpp:32:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ( "secv3.out", "w", stdout ); ^