Compilare: main.cpp: In function 'char Advance()': main.cpp:21:39: 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, SIZE, stdin); ^ main.cpp: In function 'int main()': main.cpp:170:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] files(FILENAME); ^ main.cpp:170:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]