View Compilation Error

0_0_39795495_23584.cpp: In function 'int main()':
0_0_39795495_23584.cpp:46:44: error: 'change2' was not declared in this scope; did you mean 'change1'?
   46 |                         else if(op[0]=='S')change2(1,1,n,a,-b);
      |                                            ^~~~~~~
      |                                            change1