506第四组课后习题

#include<stdio.h>
main()
{
    int x,y;
    float tax;
    printf("Enter income:");
    scanf("%d",&x);
    printf("\n");
    y=x/400;
    switch(y)
    {
        case 0:
        case 1:tax=0;break;
        case 2:tax=(x-800)*0.05;break;
        case 3:
        case 4:tax=400*0.05+(x-1200)*0.08;break;
        case 5:
        default:tax=400*0.05+800*0.08+(x-2000)*0.20; 
    }
    printf("Tax=%.2f\n",tax);
 }