View Compilation Error

0_0_37489319_21556.cpp: In function 'int main()':
0_0_37489319_21556.cpp:33:5: error: 'cnt' was not declared in this scope
     cnt ++;
     ^
0_0_37489319_21556.cpp:37:12: error: 'cnt' was not declared in this scope
    cout << cnt << '\n';
            ^