C语言薪资单程序输出全为0，代码与GPT一致却失效求助

云上老周

2026-7-27

C语言薪资单代码输出全0问题修复

你的代码核心问题是混淆了赋值运算符=和相等比较运算符==，同时错误使用逻辑与&&连接赋值操作，导致所有薪资相关变量根本没有被正确赋值，最终输出全0。

错误点详解：

你在if/else分支里写的hra == 0.03 * bs是在判断hra和0.03*bs是否相等，而不是把0.03*bs的值赋给hra，正确写法应为hra = 0.03 * bs;。
用&&连接多个操作是逻辑判断的用法，多个赋值语句需要用分号;分隔，而非&&。
计算totalsalary时同样误用了==，需改为=。

修复后的代码：

#include <stdio.h>

int main()
{
    float bs, hra, ma, da, ta, tax, ub, totalsalary;
    printf("Enter basic salary: \n");
    scanf("%f", &bs);
    if (bs < 15000)
    {
        hra = 0.03 * bs;
        ma = 0.02 * bs;
        da = 0.02 * bs;
        ta = 0.01 * bs;
        tax = 0.005 * bs;
        ub = 0.04 * bs;
    }
    else if (bs >= 15000 && bs <= 30000)
    {
        hra = 0.05 * bs;
        ma = 0.03 * bs;
        da = 0.04 * bs;
        ta = 0.02 * bs;
        tax = 0.02 * bs;
        ub = 0.04 * bs;
    }
    else
    {
        hra = 0.04 * bs;
        ma = 0.07 * bs;
        da = 0.03 * bs;
        ta = 0.03 * bs;
        tax = 0.03 * bs;
        ub = 0.1 * bs;
    }

    totalsalary = bs + hra + ma + da + ta - tax - ub;
    printf("\nSalary slip\n");
    printf("House rent allowance: %.2f\n", hra);
    printf("Medical Allowance: %.2f\n", ma);
    printf("Daily Allowance: %.2f\n", da);
    printf("Traveling Allowance: %.2f\n", ta);
    printf("Tax:  %.2f\n", tax);
    printf("Utility bills: %.2f\n", ub);
    printf("Total Salary is: %.2f\n", totalsalary);
    return 0;
}