用switch语句表示运费

#include<stdio.h>

int main()
{
  int x, y,s,w;
  double d, p,f;
  printf("请输入距离s,基本运费,货物重:");
  scanf("%d%lf%d", &s,&p,&w);
  x = s / 1000;
  y = s / 250;
  switch (x)
  {
  case 1:
    d = 0.08;
    break;
  case 2:
    d = 0.1;
    break;
  case 3:
    d = 0.15;
    break;
  case 0:
    switch (y)
    {
    case 0:
      d = 0;
      break;
    case 1:
      d = 0.02;
      break;
    case 2:
      d = 0.05;
      break;
    }
  default:
    printf("里程数输入错误");
    break;
  }
  f = p * w * s * (1 - d);
  printf("f=%10.2lf\n", f);
  return 0;
}