我如何使用c中的函数返回的值

Question

因此，我有一个程序，该程序使用功能来计算个人免税额和应纳税所得额。我想知道如何从函数中获取计算出的值并将变量'personalAllowance'设置为此值，以便我的代码可以正常工作。由于当前正在打印零。

float compute_taxable_income(float annualSalary, float personalAllowance) 
 {
   float taxableIncome;

        taxableIncome = (annualSalary - personalAllowance);


    return taxableIncome;
}


  float compute_personal_allowance ( float annualSalary )
    {
        float personalAllowance;

    if (annualSalary <= 100000)
        personalAllowance = 11850;

    else if (annualSalary > 100000 && annualSalary < 123700) 
        { 
        personalAllowance = 11850 - ((annualSalary - 100000) /2);
        }
    else 
        personalAllowance = 0;



    return personalAllowance;
}

 int main()
  {
    // Variables
      float annualSalary;
      float taxableIncome;
      float personalAllowance;

        printf("what is the annualSalary \n");
        scanf("%f",&annualSalary);

        compute_personal_allowance (annualSalary );

        compute_taxable_income( annualSalary, personalAllowance);

        printf("the Taxable income is %f ", taxableIncome);



  return 0;
}

Answer 1

您没有为personalAllowance或taxableIncome分配任何内容。您需要为它们分配相关函数的返回值：

personalAllowance = compute_personal_allowance (annualSalary );
taxableIncome = compute_taxable_income( annualSalary, personalAllowance);