/in/foo.cc: In function 'int main()':
/in/foo.cc:8:2: error: expected ';' before 'while'
  while(x>0) 
  ^~~~~
/in/foo.cc:16:2: warning: statement has no effect [-Wunused-value]
  }
  ^
/in/foo.cc:6:7: warning: unused variable 'x1' [-Wunused-variable]
  int  x1, x;
       ^~