Compilare: user.cpp: In member function ‘int ifbuffer::getnr()’: user.cpp:37:31: warning: array subscript has type ‘char’ [-Wchar-subscripts] while ( !isDigit[c] && c != '-' ) ^ user.cpp:44:30: warning: array subscript has type ‘char’ [-Wchar-subscripts] while ( isDigit[c] ) { ^ user.cpp: In function ‘int main()’: user.cpp:233:33: warning: deprecated conversion from string constant to ‘char*’ [-Wwrite-strings] ifbuffer fin( "superbec.in" ); ^ user.cpp:234:35: warning: deprecated conversion from string constant to ‘char*’ [-Wwrite-strings] ofbuffer fout( "superbec.out" ); ^ user.cpp:254:25: warning: array subscript has type ‘char’ [-Wchar-subscripts] M[G[i]][T[ch]] = 1; ^ user.cpp:236:24: warning: unused variable ‘k’ [-Wunused-variable] int t, n, m, i, j, k, l, s, u; ^ user.cpp:236:33: warning: unused variable ‘u’ [-Wunused-variable] int t, n, m, i, j, k, l, s, u; ^ user.cpp: In member function ‘void ifbuffer::refill()’: user.cpp:21:41: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread( text, 1, size, file ); ^