View Compilation Error

0_0_21594800_4394.cpp: In function 'int main()':
0_0_21594800_4394.cpp:20:17: error: 'cnt' was not declared in this scope
                 cnt++;
                 ^
0_0_21594800_4394.cpp:24:17: error: 'cnt' was not declared in this scope
         cout << cnt << endl;
                 ^