mortgage program

[rapoza85]

I'm trying to do this chart in c++ and i'm stuck.


Principle= 150,000.00 rate= 6% 0.005
Payment= 6,648.10 Years= 2 24

Month Principle interest $ to Prin Prin Balance
1 $150,000.00 $750.00 $5,898.10 $144,101.90
2 $144,101.90 $720.51 $5,927.59 $138,174.31
3 $138,174.31 $690.87 $5,957.23 $132,217.08
4 $132,217.08 $661.09 $5,987.01 $126,230.07
5 $126,230.07 $631.15 $6,016.95 $120,213.12
6 $120,213.12 $601.07 $6,047.03 $114,166.08
7 $114,166.08 $570.83 $6,077.27 $108,088.81
8 $108,088.81 $540.44 $6,107.66 $101,981.16
9 $101,981.16 $509.91 $6,138.19 $95,842.96
10 $95,842.96 $479.21 $6,168.89 $89,674.08
11 $89,674.08 $448.37 $6,199.73 $83,474.35
12 $83,474.35 $417.37 $6,230.73 $77,243.62
13 $77,243.62 $386.22 $6,261.88 $70,981.74
14 $70,981.74 $354.91 $6,293.19 $64,688.55
15 $64,688.55 $323.44 $6,324.66 $58,363.89
16 $58,363.89 $291.82 $6,356.28 $52,007.61
17 $52,007.61 $260.04 $6,388.06 $45,619.55
18 $45,619.55 $228.10 $6,420.00 $39,199.54
19 $39,199.54 $196.00 $6,452.10 $32,747.44
20 $32,747.44 $163.74 $6,484.36 $26,263.08
21 $26,263.08 $131.32 $6,516.78 $19,746.29
22 $19,746.29 $98.73 $6,549.37 $13,196.93
23 $13,196.93 $65.98 $6,582.12 $6,614.81
24 $6,614.81 $33.07 $6,615.03 ($0.22)

Here's my code , can anyone help?

  #include "stdafx.h"
#include <stdio.h>
int main(void)
{

 double principleA[24];
 double interestA[24];
 double dolPrinA[24];
 double prinBalanceA[24];


int years, months, index;
double principle, rate, interest, dolPrin, princBalance, payment;


printf("Hello, this program calculates a payment plan for your loan and display every month's information.\n");
printf("Ok, to start we will need to ask you a few questions. Lets get started!\n");

principle= 150000;
years=2;
months= years * 12;
rate=6;
principleA[1] = principle;



interestA[1] = (rate/100)/12*principleA[1];
payment = 6648.10;//principleA[0] + interestA[0] / months;
dolPrinA[1] = payment - interestA[1];
prinBalanceA[1] = principleA[1] - dolPrinA[1];

printf("Month     Principle   interest $to princ     Prin Balance\n");
for (index = 0; index < months;)
{
		printf("  %2d      %.2lf    %.2lf    %.2lf      %.2lf\n", index++, principleA[1],interestA[1],dolPrinA[1],prinBalanceA[1]);
		
		principleA[1]= prinBalanceA[index];
		interestA[1] = (rate/100)/12*principleA[index];
		dolPrinA[1]= payment - interestA[index];
		prinBalanceA[1]=principleA[index] - dolPrinA[index];
		principleA[2]=prinBalanceA[index];
		interestA[2] = (rate/100)/12*principleA[index];
		dolPrinA[2]= payment - interestA[index];
		prinBalanceA[2]=principleA[index] - dolPrinA[index];
		principleA[3]=prinBalanceA[index];
		interestA[3] = (rate/100)/12*principleA[index];
		dolPrinA[3]= payment - interestA[index];
		prinBalanceA[3]=principleA[index] - dolPrinA[index];
		principleA[4]=prinBalanceA[index];
		interestA[4] = (rate/100)/12*principleA[index];
		dolPrinA[4]=payment - interestA[index];
		prinBalanceA[4]=principleA[index] - dolPrinA[index];
		principleA[5]=prinBalanceA[index];
		interestA[5] = (rate/100)/12*principleA[index];
		dolPrinA[5]=payment - interestA[index];
		prinBalanceA[5]=principleA[index] - dolPrinA[index];
		
		
}
    return 0;
}

[ats15]

What's the reason for the for loop if you calculate all the elements by hand? What would you do if you need to pay for 30 years?

[rapoza]

i was just throwing things out there, i don't understand why the loop doesn't keep going.

[ats15]

#include <stdio.h>
int main(void)
{
  int years, months, index;
  double principle, rate, interest, dolPrin, princBalance, payment;


  printf("Hello, this program calculates a payment plan for your loan and display every month's information.\n");
  printf("Ok, to start we will need to ask you a few questions. Lets get started!\n");

  princBalance= 150000;
  years=2;
  months= years * 12;
  rate=6;
  payment=6648.10;

  printf("Month     Principle   interest $to princ     Prin Balance\n");
  for (index = 1; index <= months;index++)
  {
    principle=princBalance;
    interest=(rate/100)/12*principle;
    dolPrin=payment-interest;
    princBalance=principle-dolPrin;
   
    printf("  %2d      %.2lf    %.2lf    %.2lf      %.2lf\n", index, principle,interest,dolPrin,princBalance);
  }
  return 0;
}

The reason your thing was not working is that you initialize elements in the array up to index 5, but then, when the index is 6, on line 37, prinBalanceA[index] is not defined