Run id: 123012

Main.cc: In function 'int main()':
Main.cc:7:4: error: 's' was not declared in this scope
    s = s + a;
    ^
Main.cc:10:10: error: 's' was not declared in this scope
  cout << s;
          ^
Main.cc:4:6: warning: unused variable 'a' [-Wunused-variable]
  int a;
      ^