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#include<iostream>
#include<cmath>
#include<iomanip>
using namespace std;
//Function prototypes
char display_Menu();
double money();
double Interest();
int Years();
double loan(char& computing_choice, double& loanAmount, double& interest_rate, int years);
double factor (double Year,double interest_rate);
int main()
{
char display,show,Choice,compute_choice;
double Calculation, sum, extra_rate, months;
double amount,moneyAmount,monthly_amount;
double rate, moneyRate,Calc;
int years, period,time;
do
{
//Function Calls
display = display_Menu();
moneyAmount = money ();
rate = Interest();
years = Years();
Calculation = loan( compute_choice, sum,
extra_rate,period );
cout << endl << endl<< endl;
cout << fixed << setprecision(2);
cout << setw(4) <<" Loan Amount " << setw(10)<<" Years ";
cout << setw(23) <<" Annual Interest Rate ";
cout << setw(19)<< "Monthly Payment " <<endl;
cout << setw(10) << moneyAmount;
cout << setw(11) <<years;
cout << setw(16) << rate<< setw(19)<<Calculation <<endl;
Choice = toupper(Choice);
} while (Choice != 'E');
return 0;
cout<<endl<<endl;
cout << "Press [enter] to exit" <<endl;
cin.ignore(); //needed because of keyboard input
cin.get();
return 0;
}
// Function displays the choices and user input
char display_Menu()
{
char Choice;
cout << endl;
cout << " This program computes loan and/or saving calculations."
<< endl;
cout << endl;
cout <<" Please choos a program to calculate: " << endl;
cout << " L - Compute a Loan payment" << endl;
cout << " A - Compute a loan Amount" << endl;
cout << " S - Compute total amount saved" << endl;
cout << " M = Compute monthly amount" << endl;
cout << " E - Exit Program" << endl;
cout << endl;
cout << endl;
cout <<" Enter choice from Menu above: ";
cin >> Choice;
cout << endl;
Choice = toupper(Choice);
if ((Choice != 'L') && (Choice != 'A') &&
(Choice != 'S') && (Choice != 'M')&& (Choice != 'E'))
{
cout <<" Please enter a choice from above" << endl;
cin >> Choice;
}
if (Choice == 'E')
{
return 0;
}
return (Choice);
}
// function get the loan amount and error checks for a valid
//monetary amount.
double money()
{
double LoanAmount;
cout <<" The amount of loan you need to receive? ";
cin >> LoanAmount;
while ((LoanAmount <= 0)||(LoanAmount >999999.99 ))
{
cout <<" The amount of you entered is invalid? " <<endl;
cout <<" Please enter a valid amount ";
cin >> LoanAmount;
}
return (LoanAmount);
}
//Function askes for the Annual interest rate and error checks
// that the percentage is between 1 and 305
double Interest()
{
double Interest_Rate;
cout <<" Enter an Annual interest rate: ";
cin >> Interest_Rate;
while ((Interest_Rate >30)||(Interest_Rate <= 1))
{
cout <<" Enter interest rate lower than 30% and higher than 1% ";
cin >> Interest_Rate;
}
return (Interest_Rate);
}
//function allows the user to input the terms of the loan and
// error checks -the terms must be betweeen 50 and 1 year
int Years()
{
int Term_Years;
cout <<" Enter a term in whole years: ";
cin >> Term_Years;
while ((Term_Years > 50)||(Term_Years < 1))
{
cout <<" Years must be between one and fifty, Please try again ";
cin >> Term_Years;
}
return (Term_Years);
}
//The function does the claculations based upon the user input
double loan( char& computing_choice, double& loanAmount,
double& interest_rate,int years) {
int months = years * 12;
double rate;
double Calc;
double monthlyRate = rate/100;
double equation = factor(months,monthlyRate);
switch (toupper(computing_choice)) {
case 'L':
Calc = equation * monthlyRate * loanAmount /(equation-1);
break;
case 'A':
Calc = (equation-1) * loanAmount / (equation * monthlyRate);
break;
case 'S':
Calc = (equation-1) * loanAmount / monthlyRate;
break;
case 'M':
Calc = loanAmount * monthlyRate/(equation-1);
break;
}
return (Calc);
}
//equations used to calculate the loans and savings
double factor (double Year,double interest_rate)
{
return pow (1+interest_rate,Year);
}
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