Question

我在c ++课程中编写电话帐单程序时遇到问题。问题出在我的if，else if和else语句的混乱中。我查看了论坛以及与我类似的stackoverflow上的其他程序，但无法理解我的错误在哪里。我的教授在解释事情方面不是最好的，到目前为止，我一直在教自己。我知道这是一个非常业余的问题，但现在就是这样。

该计划的目的是练习交互式输入，数学运算，“if ... else”和“if else if”链。

系统会要求您输入电话号码（1-3）。电话计划选项如下..

Available Phone Plans:
1.  Ultimate    Unlimited talk and data     Unlimited Text      $75.00
2.  Deluxe      Unlimited talk, 3 GB data   550 Text messages   $55.00  
3.  Basic       Unlimited talk, 1 GB data   250 Text messages   $35.00

对于计划2和3，每增加一条短信将收取0.20美元（20美分）的费用。

这些是我制造的变量..

string customerName, phoneNumber, planType;
int planChoice, textMessages;
float planCost, overTextTotal, untaxedTotal, taxedTotalDeduction, 
          taxedTotalBill, stateFeeDeduction, federalFeeDeduction;
float overTextFee = .20;
const float STATEFEE = .05;
const float FEDERALFEE = .02;

这些是计算 //计算

untaxedTotal = planCost + overTextTotal;
stateFeeDeduction = untaxedTotal * STATEFEE;
federalFeeDeduction = untaxedTotal * FEDERALFEE;
taxedTotalBill = untaxedTotal + stateFeeDeduction + federalFeeDeduction;


cout<<"\n\tEnter 1 - 3 For Plan Type: "; 
cin >> planChoice;
cout<<"\nEnter Number Of Text Messages Used For The Month: "; 
cin >> textMessages;



if(planChoice == 1 )
{
    planType = "Ultimate";
    planCost =  75.00;
    overTextTotal = 0;  

}
else if(planChoice == 2)
{   
    planType = "Deluxe";
}
     if( textMessages <= 550)
    {
        planType = "Deluxe";
        planCost = 55.00;
    }
    else
    {
        planCost = 55.00;
        overTextTotal = ((textMessages - 550 ) * overTextFee);
     }

if (planChoice == 3)
        {
          planType = "Basic";
         }
            if (textMessages <= 250)
            {
                planCost = 35.00;
            }
            else
            {
                planCost = 35.00;
                overTextTotal = ((textMessages - 250 ) * overTextFee);
            }

我的问题是如何安排我的if，else if和else语句在我的输出中正确运行。

Answer 1

尝试使用以下内容更改if-else语句：

if(planChoice == 1 )
{
    planType = "Ultimate";
    planCost =  75.00;
    overTextTotal = 0;  
}
else if(planChoice == 2)
{   
    planType = "Deluxe";

    if( textMessages <= 550)
    {
        planType = "Deluxe";
        planCost = 55.00;
    }
    else
    {
        planCost = 55.00;
        overTextTotal = ((textMessages - 550 ) * overTextFee);
    }
}
else if (planChoice == 3)
{
    planType = "Basic";

    if (textMessages <= 250)
    {
        planCost = 35.00;
    }
    else
    {
        planCost = 35.00;
        overTextTotal = ((textMessages - 250 ) * overTextFee);
    }    
 }

说明：您的原始代码未将内部if-else语句包装在上部else if和else花括号中。

if / else if / else电话账单计算器C ++

1 个答案: