/in/foo.cc: In function 'int main()':
/in/foo.cc:7:10: warning: 'x' is used uninitialized in this function [-Wuninitialized]
  cout<<n*x;
          ^
/in/foo.cc:9:7: warning: 'n1' is used uninitialized in this function [-Wuninitialized]
  if(n1-n2>x)
     ~~^~~
/in/foo.cc:9:7: warning: 'n2' is used uninitialized in this function [-Wuninitialized]