c语言个税计算器2018

以下是一个简单的 C 语言个税计算器，可以计算 2018 年的个人所得税：

#include <stdio.h>

int main() {
    float income, tax;

    printf("请输入您的税前收入：\n");
    scanf("%f", &income);

    if (income <= 0) {
        printf("输入错误，请重新输入！\n");
        return 0;
    }

    float threshold = 3500; // 起征点
    float social_security = 0; // 社保公积金等五险一金

    float taxable_income = income - threshold - social_security; // 应纳税所得额

    if (taxable_income <= 0) {
        tax = 0;
    } else if (taxable_income <= 1500) {
        tax = taxable_income * 0.03;
    } else if (taxable_income <= 4500) {
        tax = taxable_income * 0.1 - 105;
    } else if (taxable_income <= 9000) {
        tax = taxable_income * 0.2 - 555;
    } else if (taxable_income <= 35000) {
        tax = taxable_income * 0.25 - 1005;
    } else if (taxable_income <= 55000) {
        tax = taxable_income * 0.3 - 2755;
    } else if (taxable_income <= 80000) {
        tax = taxable_income * 0.35 - 5505;
    } else {
        tax = taxable_income * 0.45 - 13505;
    }

    printf("您的税前收入为：%.2f 元\n", income);
    printf("您应缴纳的个人所得税为：%.2f 元\n", tax);

    return 0;
}

注：该计算器只是一个简单的示例，实际应用中还需要考虑更多的因素，如社保公积金等五险一金的扣除、专项附加扣除等。