c++ - C++:尽管我输入的数字为数千，但程序仅读取输入的数字为数百

Question

这是我的任务:

Compute for the cash value of a P 25,000 Savings Bond at any time according to the following:

• If the Bond is less than 6 months old, the interest is zero percent.
• If the Bond is between 6 and 12 months old, the interest rate is 1 percent.
• If the Bond is between 13 to 18 months old, the interest rate is 2 percent.
• If the bond is between 19 to 24 months old, the interest rate is 3.5 percent.

这是我的代码:

#include <iostream>
using namespace std;

int main()
{
    int Savings_Bond = 25000;
    int Age_Bond = 6 && 12 && 13 && 18 && 19 && 24;
    int Interest = 0.01 && 0.02 && 0.035;
    int TotalV;

    cout << "How long this bond been on? : ";
    cin >> Age_Bond;

    if (Age_Bond < 6)
    {
        TotalV = Savings_Bond * 0;
        cout << "Your Interest Rate : "
             << "0%"
             << "\n";
        cout << "Total Value : " << TotalV << "\n";
    }
    else if (Age_Bond = 6 + 12)
    {
        TotalV = Savings_Bond * 0.01;
        cout << "Your Interest Rate : "
             << "1%"
             << "\n";
        cout << "Total Value : " << TotalV << "\n";
    }
    else if (Age_Bond = 13 + 18)
    {
        TotalV = Savings_Bond * 0.02;
        cout << "Your Interest Rate : "
             << "2%"
             << "\n";
        cout << "Total Value : " << TotalV << "\n";
    }
    else if (Age_Bond = 19 + 24)
    {
        TotalV = Savings_Bond * 0.035;
        cout << "Your Interest Rate : "
             << "3.5%"
             << "\n";
        cout << "Total Value : " << TotalV << "\n";
    }
    return 0;
}

外观如下:

How long this bond been on? : 17
Your Interest Rate : 1%
Total Value : 250

Answer 1

您似乎对条件表达式在C++中的工作方式有一些误解。

If the Bond is between 6 and 12 months old, the interest rate is 1percent

在C++中这样写

else if (Age_Bond >= 6 && Age_Bond <= 12)

你还有其他问题

int Age_Bond = 6 && 12 && 13 && 18 && 19 && 24;
int Interest = 0.01 && 0.02 && 0.035;

我不确定您认为这些声明在做什么，但这没什么用。您无需使用 Interest变量，因此可以将其删除。而且 Age_Bond变量从用户输入中获取它的值，因此您无需在此处给出值。只需使用

int Age_Bond;

最后，您的值(value)计算不正确。如果利息为0％，则债券的值(value)为25000，但根据您的计算，该值(value)将为零。如果利息为1％，则值为25250，但是您的计算结果为250，依此类推。基本上，您需要将利息添加到现有值中。