Compilare: main.cpp: In function 'char getChar()': main.cpp:31:38: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, buffer, stdin); ^ main.cpp: In function 'int main()': main.cpp:57:42: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("magicmatrix.in", "r", stdin); ^