View Compilation Error

0_0_37752252_13045.cpp: In function 'int main()':
0_0_37752252_13045.cpp:23:10: error: 'i' was not declared in this scope
      for(i=1;i<=n;i++)
          ^
0_0_37752252_13045.cpp:33:16: error: 'a' was not declared in this scope
             if(a!=b) 
                ^
0_0_37752252_13045.cpp:33:19: error: 'b' was not declared in this scope
             if(a!=b) 
                   ^