tax.cpp

#include <bits/stdc++.h>

#define long long long

using namespace std;

int age, children, parents, disabled;
long income;
char name[100], input;

int main() {
    printf("\n================================\n");
    printf("      Tax Calculator 2017       \n");
    printf("================================\n\n");

    printf("Enter your name: ");
    scanf(" %s", name);

    printf("Enter your age: ");
    scanf("%d", &age);
    if(age < 18) {
        printf("You do not have to pay tax\n");
        return 0;
    }

    printf("Enter your income: ");
    scanf("%lld", &income);

    income -= 60000ll;

    printf("Is your spouse a taxpayer (Y/N): ");
    scanf(" %c", &input);
    if(input == 'N') income -= 60000ll;

    printf("How many children do you have : ");
    scanf("%d", &children);
    if(children > 0) income -= 30000ll * children;

    printf("Do you in need of maternity expense (Y/N): ");
    scanf(" %c", &input);
    if(input == 'Y') income -= 60000ll;

    printf("How many of your parents you are taking care of : ");
    scanf("%d", &parents);
    if(parents > 0) income -= 30000ll * parents;

    printf("How many disabled are you in charge of : ");
    scanf("%d", &disabled);
    if(disabled > 0) income -= 60000ll * disabled;

    printf("\n================================\n");
    printf("Your net income after deduction : %lld\n baht", max(income, 0ll));

    double tax;
    if(income <= 150000) tax = 0;
    else if(income <= 300000) tax = 0.05 * income;
    else if(income <= 500000) tax = 0.10 * income;
    else if(income <= 750000) tax = 0.15 * income;
    else if(income <= 1000000) tax = 0.20 * income;
    else if(income <= 2000000) tax = 0.25 * income;
    else if(income <= 5000000) tax = 0.30 * income;
    else tax = 0.35 * income;

    printf("Amount of tax you need to pay : %.3f baht\n", tax);
    printf("================================\n\n");

    printf("Thank you for using our service, Mr./Mrs. %s\n", name);

    return 0;
}