C语言：Switch语句解决实际问题

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#include <stdio.h>
#define PRICE 12//此处以千千快递为例，每千克货物运费12RMB，定义常量宏

int main ( )
{
    float fWeight,fDistance,fDiscount,fFreight;//定义货物重量，运输距离，折扣，总运费
    int iCase; //设定iCase用于指标250的倍数
    printf("千千快递，1千克货物基本运费12元/公里！n");
    printf("请输入货物重量（千克）：");
    scanf("%f",&fWeight);
    if(fWeight<0)
    {
        printf("错误!物品重量不能为负数！n");
        return main();
    }
    printf("请输入距离（千米：）");
    scanf("%f",&fDistance);
    if(fDistance<0)
    {
        printf("错误!与数据里不能为负数！n");
        return main();
    }
    if(fDistance>3000)
    {
        fDiscount=0.15;
    }
    else
    {
    iCase=fDistance/250;
    switch (iCase)
    {
    case 0:
        fDiscount=0;
        break;
    case 1:
        fDiscount=0.02;
        break;
    case 2:
    case 3:
        fDiscount=0.05;
        break;
    case 4:
    case 5:
    case 6:
    case 7:
        fDiscount=0.08;
        break;
    case 8:
    case 9:
    case 10:
    case 11:
    case 12:
        fDiscount=0.1;
        break;
    }

    }
    fFreight=PRICE*fWeight*fDistance*(1-fDiscount);
    printf("总运费为：%5.3f 元",fFreight);
    return 0;

}