View Compilation Error

0_0_36491582_9078.cpp: In function 'int main()':
0_0_36491582_9078.cpp:43:21: error: 'flag' was not declared in this scope
                     flag=1;
                     ^
0_0_36491582_9078.cpp:47:16: error: 'flag' was not declared in this scope
             if(flag)
                ^