View Compilation Error

0_0_33644358_20944.cpp: In function 'int main()':
0_0_33644358_20944.cpp:71:20: error: invalid types 'char[int]' for array subscript
             if(op[0]=='C'){
                    ^
0_0_33644358_20944.cpp:75:26: error: invalid types 'char[int]' for array subscript
             }else if(op[0]=='Q'){
                          ^
0_0_33644358_20944.cpp:79:26: error: invalid types 'char[int]' for array subscript
             }else if(op[0]=='H'){
                          ^
0_0_33644358_20944.cpp:83:26: error: invalid types 'char[int]' for array subscript
             }else if(op[0]=='B'){
                          ^