View Compilation Error

0_0_39435487_31513.cpp: In function 'int main()':
0_0_39435487_31513.cpp:12:20: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
   12 |             if(x[i]=="H"){
0_0_39435487_31513.cpp:15:25: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
   15 |             else if(x[i]=="O"){
0_0_39435487_31513.cpp:18:25: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
   18 |             else if(x[i]=="C"){