Compilare: main.cpp: In function 'void read(int&)': main.cpp:11:58: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] if (++p == dim) fread(buff, 1, dim, stdin), p = 0; ^ main.cpp:14:58: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] if (++p == dim) fread(buff, 1, dim, stdin), p = 0; ^ main.cpp: In function 'void read(char&)': main.cpp:20:58: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] if (++p == dim) fread(buff, 1, dim, stdin), p = 0; ^ main.cpp:22:54: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] if (++p == dim) fread(buff, 1, dim, stdin), p = 0; ^ main.cpp: In function 'int main()': 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("trompeta.in", "r", stdin); ^ main.cpp:33:41: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("trompeta.out", "w", stdout); ^