I would like help for my project ,I want do program calculator monthly payment  for Auto loan and Mortgage loan .I do program but I have wrong calculator for  payment and can you make design for me nice these project meddler project. I used these website http://www.bankrate.com/calculators/mortgages/loan-calculator.aspx for check my job .

I like make monthly payment , amount loan, Interest monthly  and total payment 

and need if have wrong choice skip other question and I want if have under credit score 400 or 850 put invalid number and any answer invalid member skip question 

 

Thanks 

#include <iostream>
#include<cmath>
#include<iomanip>
using namespace std;
int main()
{
 int choice;
 double Amount_laon, creditscore, monyhlypayment, NumPayments, NumPayment, intrest, AmountPaid;
 const double  loanupA500 = 0.425, loanupA600 = 0.325, loanupA700 = 0.275;
 const double  loanupM500 = .6, loanupM600 = 0.5, loanupM700 = 0.4;
 const double Auto_loan = 1;
 const double Mortgage_loan = 2;
 cout << "Loan's Stable" << endl;
 cout << "_______________________________________________________________________________________________" << endl;
 cout << "Loan Type               under 500       Up 500           up 600           up 700" << endl;
 cout << "______________________________________________________________________________________________" << endl;
 cout << "1.Auto loan             NOt Approve      4.25%             3.25%            2.75%                   " << endl;
 cout << "2.Mortgage loan         NOt Approve      6.00%             5.00%            4.00%               " << endl;
 cout << "nEnter type of laons <1-2> : ";
 cin >> choice;
 cout << "nEnter Number Your credit Score  =";
 cin >> creditscore;
  cout << "nEnter Amount loan you want  =";
 cin >> Amount_laon;
 cout << "nhow many yreas  =";
 cin >> NumPayment;
 NumPayments = NumPayment * 12;
 switch (choice)
 {
 case 1:
  if (creditscore < 0)
  {
   cout << "n invaild number," << endl;
  }
  else if (creditscore < 500)
  {
   cout << "Not Approve "<<endl;
  }
  else if (creditscore >= 500 && creditscore <600)
  {
   cout << loanupA500 << endl;
   intrest = pow(1 + loanupA500 / 100, 1.0 / 12);
  }
  else if (creditscore >= 600&& creditscore <700)
  {
   cout << loanupA600 << endl;
   intrest = pow(1 + loanupA600 / 100, 1.0 / 12);
  }
  else
  {
   cout << loanupA700 << endl;
   intrest = pow(1 + loanupA700 / 100, 1.0 / 12);
  
 }
  monyhlypayment = Amount_laon * pow(intrest, NumPayments) *
   (intrest - 1) /
   (pow(intrest, NumPayments) - 1);
  AmountPaid = monyhlypayment * NumPayments;
  cout << "Monthly Payment:  " << monyhlypayment << endl;
  break;
 case 2:
  if (creditscore < 0)
  {
   cout << "n invaild number," << endl;
  }
  else if (creditscore < 500)
  {
   cout << "Not Approve " << endl;
  }
  else if (creditscore >= 500 && creditscore <600)
  {
   cout << loanupM500 << endl;
   intrest = pow(1 + loanupM500 / 100, 1.0 / 12);
  }
  else if (creditscore >= 600 && creditscore <700)
  {
   cout << loanupM600 << endl;
   intrest = pow(1 + loanupM600 / 100, 1.0 / 12);
  }
  else
  {
   cout << loanupM700 << endl;
   intrest = pow(1 + loanupM700 / 100, 1.0 / 12);
  }
  
  monyhlypayment = Amount_laon * pow(intrest, NumPayments) *
   (intrest - 1) /
   (pow(intrest, NumPayments) - 1);
  AmountPaid = monyhlypayment * NumPayments;
  cout << "Monthly Payment:  " << monyhlypayment << endl;
  system("pause");
  return 0;
 }
  system("pause");
  return 0;
 }

 

 

#include &lt;iostream&gt;
#include&lt;cmath&gt;
#include&lt;iomanip&gt;
using namespace std;
int main()
{
int choice;
double Amount_laon, creditscore, monyhlypayment, NumPayments, NumPayment,
intrest, AmountPaid;
const double loanupA500 = 0.425, loanupA600 = 0.325, loanupA700 = 0.275;
const double loanupM500 = .6, loanupM600 = 0.5, loanupM700 = 0.4;
const double Auto_loan = 1;
const double Mortgage_loan = 2;
cout &lt;&lt; &quot;Loan's Stable&quot; &lt;&lt; endl;
cout &lt;&lt;
&quot;_______________________________________________________________________________
________________&quot; &lt;&lt; endl;
cout &lt;&lt; &quot;Loan Type
under 500
Up 500
up 600
up 700&quot; &lt;&lt; endl;
cout &lt;&lt;
&quot;_______________________________________________________________________________
_______________&quot; &lt;&lt; endl;
cout &lt;&lt; &quot;1.Auto loan
NOt Approve
4.25%
3.25%
2.75%
&quot; &lt;&lt; endl;
cout &lt;&lt; &quot;2.Mortgage loan
NOt Approve
6.00%
5.00%
4.00%
&quot; &lt;&lt; endl;
cout &lt;&lt; &quot;\nEnter type of laons &lt;1-2&gt; : &quot;;
cin &gt;&gt; choice;
cout &lt;&lt; &quot;\nEnter Number Your credit Score =&quot;;
cin &gt;&gt; creditscore;
cout &lt;&lt; &quot;\nEnter Amount loan you want =&quot;;
cin &gt;&gt; Amount_laon;
cout &lt;&lt; &quot;\nhow many yreas =&quot;;
cin &gt;&gt; NumPayment;
NumPayments = NumPayment * 12;
switch (choice)
{
case 1:
if (creditscore &lt; 0)
{
cout &lt;&lt; &quot;\n invaild number,&quot; &lt;&lt; endl;
}
else if (creditscore &lt; 500)
{
cout &lt;&lt; &quot;Not Approve &quot;&lt;&lt;endl;
}
else if (creditscore &gt;= 500 &amp;&amp; creditscore &lt;600)
{
cout &lt;&lt; loanupA500 &lt;&lt; endl;
intrest = pow(1 + loanupA500 / 100, 1.0 / 12);
}
else if (creditscore &gt;= 600&amp;&amp; creditscore &lt;700)
{
cout &lt;&lt; loanupA600 &lt;&lt; endl;
intrest = pow(1 + loanupA600 / 100, 1.0 / 12);
}
else
{ cout &lt;&lt; loanupA700 &lt;&lt; endl; intrest = pow(1 + loanupA700 / 100, 1.0 / 12);
} monyhlypayment = Amount_laon * pow(intrest, NumPayments) *
(intrest - 1) /
(pow(intrest, NumPayments) - 1); AmountPaid = monyhlypayment * NumPayments;
cout &lt;&lt; &quot;Monthly Payment: &quot; &lt;&lt; monyhlypayment &lt;&lt; endl;
break;
case 2:
if (creditscore &lt; 0)
{
cout &lt;&lt; &quot;\n invaild number,&quot; &lt;&lt; endl;
}
else if (creditscore &lt; 500)
{
cout &lt;&lt; &quot;Not Approve &quot; &lt;&lt; endl;
}
else if (creditscore &gt;= 500 &amp;&amp; creditscore &lt;600)
{
cout &lt;&lt; loanupM500 &lt;&lt; endl;
intrest = pow(1 + loanupM500 / 100, 1.0 / 12);
}
else if (creditscore &gt;= 600 &amp;&amp; creditscore &lt;700)
{
cout &lt;&lt; loanupM600 &lt;&lt; endl;
intrest = pow(1 + loanupM600 / 100, 1.0 / 12);
}
else
{
cout &lt;&lt; loanupM700 &lt;&lt; endl;
intrest = pow(1 + loanupM700 / 100, 1.0 / 12);
}
monyhlypayment = Amount_laon * pow(intrest, NumPayments) *
(intrest - 1) /
(pow(intrest, NumPayments) - 1); } AmountPaid = monyhlypayment * NumPayments;
cout &lt;&lt; &quot;Monthly Payment: &quot; &lt;&lt; monyhlypayment &lt;&lt; endl;
system(&quot;pause&quot;);
return 0;
system(&quot;pause&quot;);
return 0; }