#include <stdio.h>
#define AMT_SINGLE 17850
#define AMT_HOUSEHOLDER 23900
#define AMT_MARRY 29750
#define AMT_DIVORCE 14875
#define RATE1 0.15
#define RATE2 0.28

int main(void)
{
    double salary,tax;
    double amt;
    int index;
    int i;

    printf("Which kind of tax payment you fitted,\nPlease input the number showed below (q to quit): \n");
    printf("***************************************\n");
    printf("1) Single          2)Householder\n");
    printf("3) Married         4)Divorced\n");
    printf("5) Quit\n");
    printf("***************************************\n");

    while(scanf("%d",&index) == 1)
    {

        switch (index)
        {
            case 1:amt = 17850;i = 1;break;
            case 2:amt = 23900;i = 1;break;
            case 3:amt = 29750;i = 1; break;
            case 4:amt = 14875;i = 1; break;
            case 5:i = 0;break;
            default:printf("Please input the fallowing number(1~4): \n");i = scanf("%d",&index);break;
        }
        while (i)
        {
            printf("Next Type # to return previous level or input your Gross salary: ");
            while ((i = scanf("%lf",&salary)) == 1 )
            {
                if (salary > 0)
                    tax = (salary > amt ? (salary - amt) * RATE2 + amt * RATE1:amt * RATE1);
                else
                    printf("Wrong,type the positive number\n");

                printf("Your gross salary %0.2lf\n",salary);
                printf("Your tax: %.2lf\n",tax);
                printf("Net income: %0.2lf\n",salary - tax);
                printf("Type # to return previous level or salary :");
            }
        }
        printf("***************************************\n");
        printf("1) Single          2)Householder\n");
        printf("3) Married         4)Divorced\n");
        printf("5) Quit\n");
        printf("***************************************\n");
        printf("Which kind of tax payment you fitted,\nPlease input the number showed above (q to quit): \n");
    }

    return 0;
    }