View Compilation Error

0_0_28144249_18297.cpp: In function 'int main()':
0_0_28144249_18297.cpp:53:6: error: 'flag' was not declared in this scope
   if(flag==1) cout<<endl;  //  endl
      ^
0_0_28144249_18297.cpp:54:3: error: 'flag' was not declared in this scope
   flag=1;
   ^