Compilare: user.cpp: In member function ‘int ifbuffer::getnr()’: user.cpp:52:31: warning: array subscript has type ‘char’ [-Wchar-subscripts] while ( !isDigit[c] && c != '-' ) ^ user.cpp:59:30: warning: array subscript has type ‘char’ [-Wchar-subscripts] while ( isDigit[c] ) { ^ user.cpp: In member function ‘ifbuffer& ifbuffer::operator>>(char*)’: user.cpp:97:33: warning: array subscript has type ‘char’ [-Wchar-subscripts] } while ( isBlank[ch] ); ^ user.cpp:98:32: warning: array subscript has type ‘char’ [-Wchar-subscripts] while ( !isBlank[ch] ) { ^ user.cpp: In function ‘int main()’: user.cpp:175:33: warning: deprecated conversion from string constant to ‘char*’ [-Wwrite-strings] ifbuffer fin( "strmatch.in" ); ^ user.cpp:176:35: warning: deprecated conversion from string constant to ‘char*’ [-Wwrite-strings] ofbuffer fout( "strmatch.out" ); ^ user.cpp:179:14: warning: suggest parentheses around ‘+’ inside ‘>>’ [-Wparentheses] fin >> a + 1 >> b + 1; ^ user.cpp:179:23: warning: suggest parentheses around ‘+’ inside ‘>>’ [-Wparentheses] fin >> a + 1 >> b + 1; ^ user.cpp: In member function ‘void ifbuffer::refill()’: user.cpp:36:41: 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 ); ^