如何让这个功能运行多次？

让我首先注意到我是C++的绝对BEGINNER。所以，请放轻松点我。如何让这个功能运行多次？

我一直在写下面的代码，作为今年夏天编程方法课程的一部分。这意味着银行计划会根据用户输入来计算月数（n），利率（i）和用户贷款的每月支付。然后，该程序应该从用户处收取一笔付款金额并计算新的余额。从这里，它应该打印一份摊销报告，描述期初余额，利息支付，主要付款和期末余额。所有这些工作都很好，但接下来我遇到了麻烦。该程序应该能够进行多次付款并为摊销报告添加额外的行，并且我无法弄清楚如何再次运行“付款”功能以获得这些额外付款。请帮助！！

此外，我知道为成员函数设置的参数几乎是不需要的，因为它们被用户输入替换，但是它们是指导者在赋值指令中所要求的。

再次感谢您给予的任何建议！

#ifndef LOAN_DATA_H 
#define LOAN_DATA_H 

class Loan_Data 
{ 
private: 
    double Bal; 
    double n; 
    double i; 
    double A; 
     double p; 

public: 
      Loan_Data(double p, double n, double i); 
    void MakePayment(double pay); 
    void PrintAmortizationSchedule(); 
}; 

#endif /* LOAN_DATA_H */ 




#include <cstdlib> 
#include <cmath> 
#include <iostream> 
#include "Loan_Data.h" 

using namespace std; 


Loan_Data::Loan_Data(double p, double n, double i) 
{ 
    cout << "Enter the loan amount: $"; 
    cin >> this->p; 
    cout << "Enter the loan length: "; 
    cin >> this->n; 
    cout << "Enter your credit score: "; 
    cin >> this->i; 

    this->i = this->i/100; 
    this->i = this->i/12; 
    this->n = this->n * 12; 
    Bal = this->p; 
    A = (this->p * ((this->i * pow(1 + this->i, n))/(pow(1 + this->i, n) - 1))); 

    cout << "A is: " << A << endl; 
    cout << "Bal is: " << Bal << endl; 
    cout << "i is: " << this->i << endl; 
} 
void Loan_Data::MakePayment(double pay) 
{ 
    cout << "i is: " << i << endl; 
    cout << "Bal is: " << Bal << endl; 
    cout << "Enter payment first payment amount: $"; 
    cin >> pay; 

    cout << "Bal is: " << Bal << endl; 

    Bal = ((i + 1) * Bal) - pay; 
     A = pay; 
} 

void Loan_Data::PrintAmortizationSchedule() 
{ 
    double iP = (i * Bal); 
    double pP = (A - (i*Bal)); 
    double endingBalance = ((1 + i)*Bal - A); 
    double payment2 = (i + 1)*Bal; 

    cout << "Beginning Bal." << "\t""\t" << cout << "Interest paid" << "\t""\t" << cout << "Principle paid" << "\t""\t" << cout << "Ending Bal." << "\t""\t" << endl; 

    if ((i + 1)*Bal > A) 
    { 
     cout << p << "\t""\t""\t""\t" << iP << "\t""\t""\t""\t" << pP << "\t\t""\t""\t" << endingBalance << endl; 
     endingBalance = Bal; 
    } 
    else if (Bal < A) 
    { 
     cout << Bal << "\t""\t""\t""\t" << iP << "\t""\t""\t""\t" << (payment2 - (i*Bal)) << "\t\t""\t""\t" << ((1 + i)*Bal - payment2) << endl; 
     Bal = ((1 + i)*Bal - payment2); 
    } 
    else if (Bal == 0) 
    { 
     cout << "0" << "\t""\t""\t""\t""\t" << "0" << "\t""\t""\t""\t""\t" << "0" << "\t\t""\t""\t""\t" << "0" << endl; 
    } 

} 

int main(int argc, char *argv[]) 
{ 
    double Bal; 
    double p; 
    double n; 
    double i; 
    double pay; 
    double A; 


    Loan_Data loan1(p, n, i); 

    loan1.MakePayment(pay); 

    loan1.PrintAmortizationSchedule(); 

    return 0; 

}

来源

2015-06-19 JGT

您可以使用[for循环（HTTP：// EN .cppreference.com/w/cpp/language/for）或[while循环]（http://en.cppreference.com/w/cpp/language/while） – CoryKramer

修改你的主要使用do while循环 -

int main(int argc, char *argv[]) 
{ 
char ch='n'; 
do { 
double Bal; 
double p; 
double n; 
double i; 
double pay; 
double A; 
Loan_Data loan1(p, n, i); 
loan1.MakePayment(pay); 
loan1.PrintAmortizationSchedule(); 
printf("Do you want to continue "); 
ch=getchar(); 
}while(ch=='y'); 
return 0; 

}

do while循环重复你的代码，同时在条件为真即是封闭的，如果用户在1日结束时进入ÿ程序将继续，否则它会退出。

来源

2015-06-19 17:41:56

如果你想使一段代码运行不止一次根据“条件”多，然后用c++ while loop或c++ for loop.

while(condition){ 
execute function; 
} 
for(variable; condition; variable modification){ 
execute function; 
}

来源

2015-06-19 17:42:22

如何让这个功能运行多次？

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