/in/foo.cc: In function 'int main()':
/in/foo.cc:4:7: error: 'a' was not declared in this scope
  cin>>a>>end1;
       ^
/in/foo.cc:4:10: error: 'end1' was not declared in this scope
  cin>>a>>end1;
          ^~~~
/in/foo.cc:5:7: error: 'b' was not declared in this scope
  cin>>b>>end1;
       ^