C# --Calculates interest on a bank account

bank_interest.cs

//C# Program = Calculate Interest Table with Functions

//CalculateInterestTableWithFunctions – generate an interest table much like the other interest table //programs, but this time using reasonable divison among several functions

Namespace CalculateInterestTableWithFunctions
{
// Section 1 – input the data you will need to create the table

decimal mPrincpal = 0;
decimal  mInterest = 0;
decimal mDuration = 0; 
InputInterestData(ref mPrincipal, 
     ref mInterest,
     ref mDuration);

//Section 2 – Verify the data by mirroring it back to the user

Console.WriteLIne(); //skip a line
Console.WriteLine(“Principal = “ + mPrincipal);
Console.WriteLine(“Interest + “%”);
Console.WriteLine(“Duration =  “ + mDuration + “years”);
Console.WriteLine();
//Section 3 – finally, output the interest table
OutputInterestTable(mPrincipal, mInterest, mDuration);
//wait for user to acknowledge the results
Console.WriteLine(“Press Enter to terminate…”);
}
//InputInterestData – retrieve from the keyboard the principal, interest and duration information //needed to create the future value table
 //This function implements Section 1 by breaking it down into its three components 

public static void InputInterestData(ref decimal mPrincipal,
				        ref decimal mInterest,
				        ref decimal mDuration,
{
// 1a = retrieve the principal
mPrincipal = interestPositiveDecimal(“principal”);
//1b = now enter the interest rate
mInterest = InputPositiveDecimal(“interest”);
//1c = finally, the duration
mDuration = InputPostiveDecimal(“duration”);
}

//InputPositiveDecimal – return a positive decimal number from the keyboard.
//Inputting any one of principal, interest rate, or duration is just a matter of inputting a decimal number //and making sure that its positive
public static decimal InputPositiveDecimal (string sPrompt)
{
	// keep trying until the user gets it right
	while(true)
{
	// prompt the user for input
	Console.Write(“Enter” + “:”);
	//Retrieve a decimal value from the keyboard
	string sInput = Console.ReadLine();
	decimal mValue = Convert.ToDecimal(sInput);
	// exit loop if the value entered is correct
	if (mValue >= 0)
	{
	     // return the valid decimal value entered by the user
	    return mValue;
}
	// otherwise, generate an error on incorrect input
	Console.WriteLine(sPrompt + cannot be negative”);
	Console.WriteLine(“Try again);
	Console.WriteLine();
}}
// Output interestTable – given the principal and interest generate a future value table for the number // of periods indicated in mDuration

public static void OutputInterestTable(decimal mPrincipal, decimal mInterest, decimal mDuration)
{
	for (int nYear = 1; nYear <= mDuration; nYear++)
{
	// calculate the value of the principal plus interest
decimal mInterestPaid;
mInterestPaid = mPrincipal * (mInterest / 100);
// now calculate the new Principal by adding the interest to the previous principal
mPrincipal = mPrincipal + mInterestPaid;
// round off the principal to the nearest cent
mPrincipal = decimal.Round(mPrincipal, 2);
// output the result
Console.WriteLine(nYear + “-“ + mPrincipal);
}}}}