Question

I have the following assignment for homework.

Requirements

Design a class called TokenGiver with the following elements:

• a default constructor, a parametrized constructor that takes an int
• a method that adds a specified number of tokens to the number of tokens
• a method that subtracts exactly ONE token from your number of tokens
• a method that returns the number of tokens in your object

Other Requirements:

1. create a TokenGiver object
2. store 10 tokens in it
3. ask the TokenGiver object how many tokens it has and display the result
4. take 2 tokens out of the TokenGiver object
5. ask the TokenGiver object how many tokens it has and display the result

Question

Is there a better way to subtract two tokens at once from my Main() method, or is calling the GetToken() method twice the only way?

Code Snippet:

using System;

class Program
{
    const int NUM_TOKENS = 10;

    static void Main()
    {
    
        TokenGiver tokenMachine = new TokenGiver(NUM_TOKENS);
        Console.WriteLine("Current number of tokens = {0}", 
                tokenMachine.CountTokens());
        tokenMachine.GetToken();
        tokenMachine.GetToken();
        Console.WriteLine("New number of tokens = {0}", 
                tokenMachine.CountTokens());

        Console.ReadLine();
    }

}

class TokenGiver
{
    private int numTokens;

    public TokenGiver()
    {
        numTokens = 0;
    }

    public TokenGiver(int t)
    {
        numTokens = t;
    }

    public void AddTokens(int t)
    {
        numTokens += t;
    }

    public void GetToken()
    {
        numTokens--;
    }

    public int CountTokens()
    {
        return numTokens;
    }
}

Answer 1

There is a better way, as Ed said. But with your assignment saying that you need a method to subtract exactly 1 Token, you are doing it how you should.

public void GetToken(int t)
{
    numTokens -= t;
}

then you would could call GetToken(2);