Compilare: user.cpp: In function ‘int main()’: user.cpp:68:15: warning: variable ‘b’ set but not used [-Wunused-but-set-variable] int n, m, b; ^ user.cpp: In member function ‘char hpstream::nextch()’: user.cpp:27:38: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(str, 1, BMAX, file); ^