C++ 以C+表示的贷款偿还计算+；_C++

C++ 以C+表示的贷款偿还计算+；

c++

C++ 以C+表示的贷款偿还计算+；,c++,C++,我正在写一个程序，它将计算每月的贷款付款。但它并没有给出正确的答案。这是我的密码： #include<iostream> #include<cmath> using namespace std; int main() { double YearlyInt, LoanAmount, Payment, AmountPaid, MonthlyInt; int NumPayments; cout << "Enter the loan

我正在写一个程序，它将计算每月的贷款付款。但它并没有给出正确的答案。这是我的密码：

#include<iostream>
#include<cmath>

using namespace std;

int main()
{

    double  YearlyInt, LoanAmount, Payment, AmountPaid, MonthlyInt;
    int NumPayments;

    cout << "Enter the loan amount (LoanAmount) --> ";
    cin >> LoanAmount;

    cout << "Enter the YEARLY interest rate as a percentage --> ";
    cin >> YearlyInt;

    cout << "Enter number of payments --> ";
    cin >> NumPayments;

    cout << "Loan amount: " << LoanAmount << endl;
    cout << "Yearly Interest Rate: " << YearlyInt << "%" << endl;
    cout << "Number of Payments: " << NumPayments << endl;

    MonthlyInt = YearlyInt / 12;

    Payment = MonthlyInt * pow (( 1 + MonthlyInt ), NumPayments) /  (pow(( 1 + MonthlyInt), NumPayments) -1)  * LoanAmount;
    cout << "Monthly Payment:  " << Payment << endl;

    AmountPaid = Payment * 36;

    cout << "Amount Paid Back: " << AmountPaid << endl;
    cout << "Interest Paid:  " << (AmountPaid - LoanAmount) << endl;
    cout << "Program Over" << endl << endl << endl << endl;
    cout << "Press Enter to end -->" << endl;

    return 0;
}

这是我得到的输出：

Enter the loan amount (LoanAmount) --> 10000
Enter the YEARLY interest rate as a percentage --> 12
Enter number of payments --> 36
Loan amount: 10000
Yearly Interest Rate: 12%
Number of Payments: 36
Monthly Payment:  10000
Amount Paid Back: 360000
Interest Paid:  350000
Program Over

Press Enter to end -->
Press any key to continue . . .

正如你所看到的，贷款金额显然是错误的。如何修复代码？

程序应该计算复利还是单利

你的计算似乎不正确。你计算一个月利率，这使它看起来像单利，但你使用pow，这表明与复利有关。您可能应该对此进行调查。

有几个问题：

您以百分比为单位输入比率，因此将其转换为十进制数：

MonthlyInt/100.0

您的付款数量应该是固定的，或者由用户输入。现在它首先被读入，但是代码中使用了36个。应使用适当的变量替换它

注意整数除法。目前没有错误，但为了避免这种情况，如果您希望确保有浮动，请使用1.0和100.0，而不是仅使用1和100

确保你的数学是正确的。事实上，这应该是你做的第一件事。不过，这是一个编程网站，所以这里不谈这个话题

（可选）按照惯例，变量名不应以大写字母开头

#包括
#包括
使用名称空间std；
int main（）
{
双倍年薪、贷款金额、付款、已付金额、月收入、金额；
cout>LoanAmount；
cout>YearlyInt；
金额；
cout这里有一个程序，可以正确计算付款，假设如下：

年利息按月复利计算
贷款不收取任何费用
贷款发放后一个月开始还款
每月付款金额不变
没有错过每月付款


#包括
#包括
使用名称空间std；
int main（）
{
双倍年薪、贷款金额、付款、已付款金额、月工资；
国际货币基金组织；
cout>LoanAmount；
cout>YearlyInt；
金额；
cout第1步：MonthlyInt
由于复利的影响，不等于YearlyInt/12。在较小期间的利率和较大期间的等值利率之间转换的一般公式为：（1+r）^n=1+R。因此，在本例中，R=MonthlyInt和R=YearlyInt。因此，第一个业务顺序是更改
发件人：
致：
步骤2：添加一行打印MonthlyInt
，以便您可以验证计算结果。：）
步骤3：将AmountPaid=Payment*36；
更改为amountpayment=Payment*NumPayments；

步骤4：可选地，添加美元符号并清除小数
我们必须添加标题#include
，然后使用cout>YearlyInt设置小数位数；
金额；
不能包含
#包括
使用名称空间std；
int main（）
{
双倍年薪、贷款金额、付款、已付金额、月收入、金额；
cout>LoanAmount；
cout>YearlyInt；
金额；
cout如果您不想使用pow函数，您可以自己直接计算级数的几何和和和第n项（pow（）来自几何项和和）。请参见此处的证明：
int月=60；
浮动原则=10000；
浮动率=6.5f/100；
每月浮动系数=1+费率/12；
浮动温度=1，温度2=月系数；
对于（int i=0；i
“未给出正确答案”不是真的告诉我们你期望它做什么。你现在得到了什么，你想得到什么？对不起，我以后会更清楚。只需编辑问题并添加信息。不必抱歉，只需要修复问题！我打赌如果你告诉我们真正的问题，人们的否决票会重新添加。你的程序mming看起来不错，但你的数学有问题。例如，为什么AmountPaid总是由36笔付款组成？请看我是如何编辑你的问题的。不要输入任何与个人无关的文本-这会让人反感；格式化你的代码；制作一个清晰反映你的问题的标题。尝试在文章中使用更好的结构谢谢，我把MonthlyInt公式改为MonthlyInt=（YearlyInt/100.0）/12；我刚刚看到我在lol中硬编码了36，我将把它去掉。现在可以了！我认为他在程序中的任何地方都不会执行整数除法。@andrew.punnett我以为monthlynt在第一次修订中是整数，但事实并非如此，是的，没有……我将编辑答案。欢迎使用堆栈溢出！而这个代码片段可以解决这个问题ion，确实有助于提高您文章的质量。请记住，您将在将来回答读者的问题，而这些人可能不知道您的代码建议的原因。还请尽量不要用解释性注释挤满您的代码，这会降低代码和解释的可读性！
Enter the loan amount (LoanAmount) --> 10000
Enter the YEARLY interest rate as a percentage --> 12
Enter number of payments --> 36
Loan amount: 10000
Yearly Interest Rate: 12%
Number of Payments: 36
Monthly Payment:  10000
Amount Paid Back: 360000
Interest Paid:  350000
Program Over

Press Enter to end -->
Press any key to continue . . .

#include<iostream>
#include<cmath>

using namespace std;

int main()
{

double  YearlyInt, LoanAmount, Payment, AmountPaid, MonthlyInt, NumPayments;




cout << "Enter the loan amount (LoanAmount) --> ";
cin >> LoanAmount;

cout << "Enter the YEARLY interest rate as a percentage --> ";
cin >> YearlyInt;

cout << "Enter number of payments --> ";
cin >> NumPayments;



cout << "Loan amount: " << LoanAmount << endl;
cout << "Yearly Interest Rate: " << YearlyInt << "%" << endl;
cout << "Number of Payments: " << NumPayments << endl;

MonthlyInt = (YearlyInt/100.0) / 12;

Payment = MonthlyInt * pow (( 1 + MonthlyInt ), NumPayments) /  (pow(( 1 + MonthlyInt), NumPayments) -1)  * LoanAmount;
cout << "Monthly Payment:  " << Payment << endl;

AmountPaid = Payment * 36;
cout << "Amount Paid Back: " << AmountPaid << endl;
cout << "Interest Paid:  " << (AmountPaid - LoanAmount) << endl;


cout << "Program Over" << endl << endl << endl << endl;

cout << "Press Enter to end -->" << endl;



return 0;

#include<iostream>
#include<cmath>

using namespace std;

int main()
{
    double  YearlyInt, LoanAmount, Payment, AmountPaid, MonthlyInt;

    int NumPayments;

    cout << "Enter the loan amount (LoanAmount) --> ";
    cin >> LoanAmount;

    cout << "Enter the YEARLY interest rate as a percentage --> ";
    cin >> YearlyInt;

    cout << "Enter number of monthly payments --> ";
    cin >> NumPayments;

    cout << "Loan amount: " << LoanAmount << endl;
    cout << "Yearly Interest Rate: " << YearlyInt << "%" << endl;
    cout << "Number of Monthly Payments: " << NumPayments << endl;

    MonthlyInt = pow( 1 + YearlyInt/100, 1.0/12 );

    Payment = LoanAmount * pow( MonthlyInt, NumPayments ) * 
                           ( MonthlyInt - 1 ) / 
                           ( pow( MonthlyInt, NumPayments ) - 1 );

    cout << "Monthly Payment: " << Payment << endl;

    AmountPaid = Payment * NumPayments;
    cout << "Amount Paid Back: " << AmountPaid << endl;
    cout << "Interest Paid: " << (AmountPaid - LoanAmount) << endl;

    cout << "Program Over" << endl << endl << endl << endl;

    return 0;
}

MonthlyInt = YearlyInt / 12;

MonthlyInt = pow ( (1.0 + YearlyInt) , (1.0/NumPayments) ) - 1.0;  // note decimals!

#include<iostream>
#include<cmath>
#include<iomanip>

using namespace std;

int main()
{
    double  YearlyInt = -1, LoanAmount = -1, Payment = -1, AmountPaid = -1, MonthlyInt = -1;

    int NumPayments;

    cout << "Enter the loan amount (LoanAmount) --> ";
    cin >> LoanAmount;

    cout << "Enter the YEARLY interest rate as a decimal number (e.g. 3.25% as .0325) --> ";
    cin >> YearlyInt;

    cout << "Enter number of payments --> ";
    cin >> NumPayments;

    cout << "Loan amount: $"  << setprecision(2) << fixed << LoanAmount << endl;
    cout << "Yearly Interest Rate: "  << setprecision(3) << YearlyInt * 100 << "%" << endl;
    cout << "Number of Payments: " << NumPayments << endl;

    MonthlyInt = pow ( (1.0 + YearlyInt) , (1.0/NumPayments) ) - 1.0;

    cout << "MonthlyInt: " << MonthlyInt*100 << "%" << endl;

    Payment = MonthlyInt * pow (( 1 + MonthlyInt ), NumPayments) /  (pow(( 1 + MonthlyInt), NumPayments) -1)  * LoanAmount;
    cout << "Monthly Payment:  $"  << setprecision(2) << Payment << endl;

    AmountPaid = Payment * NumPayments;
    cout << "Amount Paid Back: $" << AmountPaid << endl;
    cout << "Interest Paid:  $" << (AmountPaid - LoanAmount) << endl;


    cout << "Program Over" << endl << endl << endl << endl;

    cout << "Press Enter to end -->" << endl;

    return 0;
}

#include<iostream>
#include<cmath>

using namespace std;

int main()
{

     double  YearlyInt, LoanAmount, Payment, AmountPaid, MonthlyInt, NumPayments;




     cout << "Enter the loan amount (LoanAmount) --> ";
     cin >> LoanAmount;

     cout << "Enter the YEARLY interest rate as a percentage --> ";
     cin >> YearlyInt;

     cout << "Enter number of payments --> ";
     cin >> NumPayments;



     cout << "Loan amount: " << LoanAmount << endl;
     cout << "Yearly Interest Rate: " << YearlyInt << "%" << endl;
     cout << "Number of Payments: " << NumPayments << endl;

     MonthlyInt = (YearlyInt/100.0) / 12;

     Payment = MonthlyInt * pow (( 1 + MonthlyInt ), NumPayments) /  (pow(( 1   + MonthlyInt), NumPayments) -1)  * LoanAmount;
     cout << "Monthly Payment:  " << Payment << endl;


     //correction to Amount paid Value
     AmountPaid = Payment * NumPayments;
     cout << "Amount Paid Back: " << AmountPaid << endl;
     cout << "Interest Paid:  " << (AmountPaid - LoanAmount) << endl;


     cout << "Program Over" << endl << endl << endl << endl;

     cout << "Press Enter to end -->" << endl;



     return 0;
}

int months = 60;
float principle = 10000;
float rate = 6.5f/100;
float monthly_factor = 1 + rate / 12;

float temp = 1, temp2= monthly_factor;
for(int i = 0;i < months - 1; i++){ //this for loop calculates the geometric sum with ratio of monthly_factor in temp and pow(monthly_factor,n) in temp2
    temp *= monthly_factor;
    temp2 *= monthly_factor;
    temp += 1;    
}

float monthly_payment = principle * temp2 / temp;