Thread: Problem in Coin-counter with scanner class

Hey all, am currently working on a small project, where the user enters an amount in cents and the program will input the least amount of coins needed (2 dollars, 1 dollars, 50 cents, 20 cents, 10 cents, 5 cents and 1 cents).

Example Output...

Please Enter amount in cents: 477

Least number of coins needed is as follows

2 coins – 2
1 coins – 0
50 cents coins – 1
20 cents coins – 1
10 cents coins – 0
5 cents coin – 1
1 cent coins – 2

Total coins needed 7.

So far i have done:

import java.util.*
public class CoinCounter {
	public static void main (String [] args){
	Scanner sc = new Scanner(System.in);
 
	int amount;
	int oneDollar
	int twoDollar;
	int fiftyCents;
	int twentyCents;
	int tenCents;
	int fiveCents;
	int oneCents;
	int totalCoins = 0;	
 
	System.out.println("Enter amount in cents: ")
	amount=sc.nextInt();
 
			System.out.println((amount / 200) + " – $2 coins");
			amount = amount % 200;
			System.out.println((amount / 100) + " – $1 coins");
			amount = amount % 100;
			System.out.println((amount / 50) + " – $0.50 coins");
			amount = amount % 50;
			System.out.println((amount / 20) + " – $0.20 coins");
			amount = amount % 20;
			System.out.println((amount / 10) + " – $0.10 coins");
			amount = amount % 10;
			System.out.println((amount / 5) + " – $0.05 coins");
			amount = amount % 5;  
			System.out.println(amount + " – $0.01 coins");
	}
 }

Im not sure if that is correct, but im now stuck on what i should do next?

Hello coccoster and welcome to the Java programming forums

There are some missing semicolons ( ; ) in your code above.

Have you been able to compile it?

Your code seems to be working fine once the semicolons are in place.

Hey coccoster,

I have just added the functionality to allow you to display the number of coins needed in your code.

import java.util.*;
 
public class CoinCounter {
 
    public static void main (String [] args){
 
        Scanner sc = new Scanner(System.in);
 
    int amount;
    int oneDollar;
    int twoDollar;
    int fiftyCents;
    int twentyCents;
    int tenCents;
    int fiveCents;
    int oneCents;
    int totalCoins = 0;    
    int myInt;
 
    System.out.println("Enter amount in cents: ");
    amount=sc.nextInt();
 
 
            System.out.println((amount / 200) + " – $2 coins");
            myInt = (amount / 200);        
            amount = amount % 200;            
 
            if(amount > 0){
                for(int a = 0; a < myInt; a++ ){
                totalCoins++;
                }
            }
 
            System.out.println((amount / 100) + " – $1 coins");
            myInt = (amount / 100);
            amount = amount % 100;
 
            if(amount > 0){
                for(int a = 0; a < myInt; a++ ){
                totalCoins++;
                }
            }
 
            System.out.println((amount / 50) + " – $0.50 coins");
            myInt = (amount / 50);
            amount = amount % 50;
 
            if(amount > 0){
                for(int a = 0; a < myInt; a++ ){
                totalCoins++;
                }
            }
 
            System.out.println((amount / 20) + " – $0.20 coins");
            myInt = (amount / 20);
            amount = amount % 20;
 
            if(amount > 0){
                for(int a = 0; a < myInt; a++ ){
                totalCoins++;
                }
            }
 
            System.out.println((amount / 10) + " – $0.10 coins");
            myInt = (amount / 10);
            amount = amount % 10;
 
            if(amount > 0){
                for(int a = 0; a < myInt; a++ ){
                totalCoins++;
                }
            }
 
            System.out.println((amount / 5) + " – $0.05 coins");
            myInt = (amount / 5);
            amount = amount % 5;  
 
            if(amount > 0){
                for(int a = 0; a < myInt; a++ ){
                totalCoins++;
                }
            }
 
            System.out.println(amount + " – $0.01 coins");
            myInt = (amount);
 
            if(amount > 0){
                for(int a = 0; a < myInt; a++ ){
                totalCoins++;
                }
            }
 
            System.out.println("Total Coins: " + totalCoins);
 
    }
 }

Enter amount in cents: 
477
2 – $2 coins
0 – $1 coins
1 – $0.50 coins
1 – $0.20 coins
0 – $0.10 coins
1 – $0.05 coins
2 – $0.01 coins
Total Coins: 7

Hope this all works as expected

Originally Posted by coccoster

Thanks mate your a champion.. Would you mind explaining to me why you chose myInt as the variable name?
and could you also explain to me the for loops you have used?

Glad I could help!

There was no real reason why I named that integer variable 'myInt'. You can call a variable pretty much what ever you want. I normally try to make the name descriptive so I can easily see what its used for but in this case I didn't put too much thought into it.

This bit of code is used for counting each coin used:

            if(amount > 0){
                for(int a = 0; a < myInt; a++ ){
                totalCoins++;
                }
            }

It first checks to see if the 'amount' is greater than 0. If it is, that means a coin is being used so we need to count it. If not then it skips this part.

myInt = (amount / 100);

gives us the number of coins used. For example, 2.

The for loop executes from 0 to the amount of coins used (myInt) so if there are 2 coins, then totalCoins++ is executed twice, adding 2 to the totalCoins value.

Always glad to help! Good luck with the rest of your project.