Compilare: user.cpp: In function ‘int main()’: user.cpp:86:32: 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, SZ, fin ); ^ user.cpp: In function ‘void read(int&)’: user.cpp:17:49: 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, SZ, fin ), pos = 0; ^ user.cpp:23:49: 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, SZ, fin ), pos = 0; ^