/in/foo.cc: In function 'int main()':
/in/foo.cc:8:7: error: 'a' was not declared in this scope
  cin>>a;
       ^
/in/foo.cc:9:7: error: 'b' was not declared in this scope
  cin>>b;
       ^
/in/foo.cc:10:7: error: 'c' was not declared in this scope
  cin>>c;
       ^
/in/foo.cc:16:2: error: expected primary-expression before 'else'
  else
  ^~~~