Monetary / Compound Interest

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Uses only integers for monetary values to calculate compound interest.

/******************************************************

** Name: 

** Filename: monetary.cpp

** Project #: Deitel & Deitel 2.51

** Project Description: Modify the program in Fig 2.21 so it uses only
		   integers for monetary values to calculate the compound 
		   interest.

** Output: Table with year and amount of deposit as it grows  with 
           interest rate

** Input:  None

** Algorithm: Make all variables for money values as integers, then
              put into penny amount.
			  Run loop till year <= 10
			  Calculate yearly amount using formula a = p ( 1 + r )^n
			  Divide amount by 100 giving an integer result 
			  Divide amount using modulus to get remainder to add
			  cents amount 
			  Print amount followed by period then print cents
			  End program



******************************************************/

// Include files
#include <iostream>  // used for cin, cout
#include <conio.h>
#include <cmath>
#include <iomanip>
using namespace std;

// Global Type Declarations

// Function Prototypes
void instruct (void);
void pause ();

//Global Variables - should not be used without good reason.

int main ()
{
	 // Declaration section
	  int amount,            // amount on deposit
	      principal = 100000;// starting principal in pennies amount
   double rate = .05;        // interest rate 
		  
		 
	 // Executable section
	 instruct ();

   cout <<"Year" << setw ( 27 ) 
        << "Amount on deposit\n" << endl;
   
   cout << setiosflags ( ios::fixed | ios::showpoint )
        << setprecision ( 2 );

   for ( int year = 1; year <= 10; year++ ) {
	   amount = principal * pow ( 1.0 + rate, year ) ;
       cout << setw( 4 ) << year << setw( 18 ) << amount / 100 
		    << '.';

	   if ( amount % 100 < 10 )
		   cout << '0' << amount % 100 << endl;
	   else 
		   cout << amount % 100 << endl;
   
   }
      
	 pause ();
	 return 0;
}

void instruct (void)
{
	  // Declaration section

	  // Executable section
}

void pause ()
{
    // Declaration section

    // Executable section
    cout << "\nPress any key to continue...";
    getch();
    cout << "\r";
    cout << "                            ";
    cout << "\r";
}


/*
Program Output

Year         Amount on deposit

   1              1050.00
   2              1102.50
   3              1157.62
   4              1215.50
   5              1276.28
   6              1340.09
   7              1407.10
   8              1477.45
   9              1551.32
  10              1628.89

Press any key to continue...



*/
Ene Uran 638 Posting Virtuoso

"Modify the program in Fig 2.21 so it uses only
integers for monetary values to calculate the compound
interest."
Why would you ever want to do that for?

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