View Compilation Error

0_0_17186476_19796.cpp: In member function 'const bool Name::operator<(const Name&) const':
0_0_17186476_19796.cpp:40:14: error: assignment of member 'Name::i' in read-only object
         for(i='A';i<='Z';++i){
              ^
0_0_17186476_19796.cpp:40:28: error: increment of member 'Name::i' in read-only object
         for(i='A';i<='Z';++i){
                            ^
0_0_17186476_19796.cpp: In member function 'const bool Name::operator==(const Name&) const':
0_0_17186476_19796.cpp:49:14: error: assignment of member 'Name::i' in read-only object
         for(i='A';i<='Z';++i){
              ^
0_0_17186476_19796.cpp:49:28: error: increment of member 'Name::i' in read-only object
         for(i='A';i<='Z';++i){
                            ^