/in/foo.cc: In function 'int main()':
/in/foo.cc:6:7: error: 'n' was not declared in this scope
  cin>>n;
       ^
/in/foo.cc:13:2: error: expected ';' before '}' token
  }
  ^
/in/foo.cc:17:2: error: expected ';' before '}' token
  }
  ^
/in/foo.cc:5:12: warning: unused variable 'x' [-Wunused-variable]
  int a,b,c,x;
            ^