Compilare: user.cpp: In function ‘int readint()’: user.cpp:75:72: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if (bpos == bsize) fread(buffer , 1 , bsize , stdin) , bpos = 0; ^ user.cpp:82:72: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if (bpos == bsize) fread(buffer , 1 , bsize , stdin) , bpos = 0; ^ user.cpp: In function ‘int main()’: user.cpp:90:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("struti.in" , "r" , stdin); ^ user.cpp:91:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("struti.out" , "w" , stdout); ^ user.cpp:93:34: 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 , bsize , stdin); ^