/in/foo.c: In function 'main':
/in/foo.c:6:10: warning: format '%f' expects argument of type 'float *', but argument 2 has type 'double' [-Wformat=]
  scanf("%f",x);
          ^
/in/foo.c:14:2: error: expected ';' before 'return'
  return 0;
  ^~~~~~