7.4 다중 선택 else if

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <ctype.h>

#define BASE1 12000000.0
#define BASE2 46000000.0
#define BASE3 88000000.0
#define BASE4 150000000.0
#define BASE5 300000000.0
#define BASE6 500000000.0

#define RATE1 (6.0 / 100.0)
#define RATE2 (15.0 / 100.0)
#define RATE3 (24.0 / 100.0)
#define RATE4 (35.0 / 100.0)
#define RATE5 (38.0 / 100.0)
#define RATE6 (40.0 / 100.0)
#define RATE7 (42.0 / 100.0)

#define BASIC_DEDUCTION 1500000.0

int main()
{
    double income = 0.0;
    double tax = 0.0;

    scanf("%lf", &income);
    income -= BASIC_DEDUCTION;

    if (income <= BASE1)
    {
        tax = income * RATE1;
    }
    else if (income <= BASE2)
    {
        tax = BASE1 * RATE1 + (income - BASE1) * RATE2;
    }
    else if (income <= BASE3)
    {
        tax = BASE1 * RATE1 + (BASE2 - BASE1) * RATE2 + (income - BASE2) * RATE3;
    }
    else if (income <= BASE4)
    {
        tax = BASE1 * RATE1 + (BASE2 - BASE1) * RATE2 + (BASE3 - BASE2) * RATE3 + (income - BASE3) * RATE4;
    }
    else if (income <= BASE5)
    {
        tax = BASE1 * RATE1 + (BASE2 - BASE1) * RATE2 + (BASE3 - BASE2) * RATE3 + (BASE4 - BASE3) * RATE4 + (income - BASE4) * RATE5;
    }
    else if (income <= BASE6)
    {
        tax = BASE1 * RATE1 + (BASE2 - BASE1) * RATE2 + (BASE3 - BASE2) * RATE3 + (BASE4 - BASE3) * RATE4 + (BASE5 - BASE4) * RATE5 + (income - BASE4) * RATE6;
    }


    printf("Tax is = %f\n", tax);
    printf("Your income after tax deduction = %f\n", income - tax);

    return 0;

}