interest rate

[malola123]

Hi,

im a novice programmer, who is learning c#;

I am creating a code where i calculate interest over a 10 year period after a user is prompted for an initial investment amount and an interest rate. Im having a problem where the error states:

An object reference is required for the nonstatic field, method, or property 'Interest.InterestCalculator(double, double)' on line 68.

here is the code:

using System;

class Interest
{
int i = 0;
double newAmount;

public static double InterestCalculator(double amount, double interestRate)
{
for (int i = 0; i <= 9; i++)
{

newAmount = amount * interestRate;

amount += newAmount;
}

return newAmount;
}


public override string ToString()
{
string result = "";
result += string.Format(" Year {0} Total = {1:F2}", i + 1, newAmount);

return result;
}
}

class Test
{
public static void Main()
{
Console.WriteLine("Interest Calculator");
double userAmount;
double userRate;
string userInput;
Console.Write("Enter an initial investment amount: ");
userInput = Console.ReadLine();

userAmount = double.Parse(userInput);

if (userAmount < 0.00d || userAmount > 100000.00d)
{
Console.WriteLine("ERROR. Please enter again.");

userInput = Console.ReadLine();

userAmount = double.Parse(userInput);
}

Console.Write("Enter annual interest rate: ");

userInput = Console.ReadLine();

userRate = double.Parse(userInput);

if (userRate < 0.00d || userRate > 1.00d)
{
Console.WriteLine("ERROR. Please enter again.");

userInput = Console.ReadLine();

userRate = double.Parse(userInput);
}

Console.WriteLine(Interest.InterestCalculator(userAmount, userRate)); // problem here.
}
}

 

[Zathras]

newAmount is defined as an instance variable. You cannot use an instance variable inside a static method.

Hint: Move the definition of newAmount inside the static method.

Hint 2: After doing that you will encounter different errors, but you should be able to continue learning as you solve them.

 

[cappmgr]

public static double InterestCalculator(double amount, double interestRate)

remove static:
public double InterestCalculator(double amount, double interestRate)

create an instance of Interest and reference the instance:
Interest interest = new Interest();
Console.WriteLine(interest.InterestCalculator(userAmount, userRate)); // problem here.

looks like HW put I think you posted enough to get a little help.

Marty