View Compilation Error

0_0_20199974_13925.cpp: In function 'int main()':
0_0_20199974_13925.cpp:26:9: error: 'yes' was not declared in this scope
   cout<<yes;
         ^
0_0_20199974_13925.cpp:28:9: error: 'no' was not declared in this scope
   cout<<no;
         ^