Compilare: user.cpp: In function ‘void read(int&)’: user.cpp:23:44: 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, buffSize, stdin ); ^ user.cpp:33:48: 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, buffSize, stdin ); ^ user.cpp:42:48: 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, buffSize, stdin ); ^ user.cpp: In function ‘int main()’: user.cpp:53:28: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(inf,"r", stdin); freopen(outf,"w",stdout); ^ user.cpp:53:54: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(inf,"r", stdin); freopen(outf,"w",stdout); ^