Compilare: user.cpp: In function ‘int main()’: user.cpp:49:17: warning: unused variable ‘nr’ [-Wunused-variable] long long n,nr; ^ user.cpp:57:15: warning: variable ‘beg’ set but not used [-Wunused-but-set-variable] long long beg = 0; ^ user.cpp:58:15: warning: variable ‘End’ set but not used [-Wunused-but-set-variable] long long End = 0; ^ user.cpp: In function ‘char nextch()’: user.cpp:15:33: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(o, 1, MAXBUF, fin); ^