c - 我如何使用从 c 中的函数返回的值

Question

所以我有一个程序使用函数来计算个人免税额和应税收入。我想知道如何从我的函数中获取计算值并将变量“personalAllowance”设置为此值，以便我的代码能够正常工作。因为它目前正在打印零。

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。您需要将相关函数的返回值赋值给它们:

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