Making Change Problem Using Greedy Algorithm Using C#

Nilesh Jadav
Nov 04, 2016
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In my previous blog– Making a Change in Greedy, I explained you how we can deal with a Greedy algorithm by making a change example. Today, we will see its program in C#, where I had taken a set of {100, 50, 20, 10, 5 and 1} and our aim is to include a method to input the purchase amount and the amount given by the customer as well as a method to output the amount of change and breakdown by denomination. Apply Greedy algorithm at the cashier side; i.e give fewer numbers of coins to satisfy the Greedy algorithm.

Algorithm

MAKE-CHANGE (n)
C ← {100, 20, 10, 5, 1} // constant.
Sol ← {}; // set that will hold the solution set.
Sum ← 0 sum of item in solution set
WHILE sum not = n
x = largest item in set C such that sum + x ≤ n
IF no such item THEN
RETURN "No Solution"
S ← S {value of x}
sum ← sum + x
RETURN S

Making a Change Problem in C#

Step 1

Open your Visual Studio. By pressing Ctrl +Shift + N, you will get your “New Project” Window.

Step 2

After pressing OK, you will get into your coding part, where you will see three files in Solution Explorer [Properties, References, Program.cs], in which Program.cs file is your main file, where you embed all your making a change program code.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace ConsoleApplication1 {
class Program {
static int note100, return100, note50, return50, note20, return20, note10, return10,
note5, return5, note1, return1, coin1, returncoins;
static int billamount = 0, recvamount = 0, differ = 0, change = 0;
private static void calcNumberNotes() {
int differ = 0;
differ = recvamount - billamount;
return100 = (int)(Math.Floor(differ / 100 m));
if (return100 > note100) {
differ = differ - (note100 * 100);
return100 = note100;
} else {
differ = differ - (return100 * 100);
}
return50 = (int)(Math.Floor(differ / 50 m));
if (return50 > note50) {
differ = differ - (note50 * 50);
return50 = note50;
} else {
differ = differ - (return50 * 50);
}
return20 = (int)(Math.Floor(differ / 20 m));
if (return20 > note20) {
differ = differ - (note20 * 20);
return20 = note20;
} else {
differ = differ - (return20 * 20);
}
return10 = (int)(Math.Floor(differ / 10 m));
if (return10 > note10) {
differ = differ - (note10 * 10);
return10 = note10;
} else {
differ = differ - (return10 * 10);
}
return5 = (int)(Math.Floor(differ / 5 m));
if (return5 > note5) {
differ = differ - (note5 * 5);
return5 = note5;
} else {
differ = differ - (return5 * 5);
}
return1 = (int)(Math.Floor(differ / 1 m));
if (return1 > note1) {
differ = differ - (note1 * 1);
return1 = note1;
} else {
differ = differ - (return1 * 1);
}
if (differ <= coin1) {
returncoins = differ;
} else {
returncoins = -1;
}
}
static void Main(string[] args) {
note100 = note50 = note20 = note10 = note5 = note1 = coin1 = 0;
Console.WriteLine("Enter your 100rs Note available");
note100 = Convert.ToInt32(Console.ReadLine());
Console.WriteLine("\n");
Console.WriteLine("Enter your 50rs Note available");
note50 = Convert.ToInt32(Console.ReadLine());
Console.WriteLine("\n");
Console.WriteLine("Enter your 20rs Note available");
note20 = Convert.ToInt32(Console.ReadLine());
Console.WriteLine("\n");
Console.WriteLine("Enter your 10rs Note available");
note10 = Convert.ToInt32(Console.ReadLine());
Console.WriteLine("\n");
Console.WriteLine("Enter your 5rs Note available");
note5 = Convert.ToInt32(Console.ReadLine());
Console.WriteLine("\n");
Console.WriteLine("Enter your 1rs Note available");
note1 = Convert.ToInt32(Console.ReadLine());
Console.WriteLine("\n");
Console.WriteLine("Enter your 1rs coint available");
coin1 = Convert.ToInt32(Console.ReadLine());
Console.WriteLine("\n");
Console.WriteLine("Enter the Bill Amount :");
billamount = Convert.ToInt32(Console.ReadLine());
Console.WriteLine("\n");
Console.WriteLine("Enter the Recieved Amount :");
recvamount = Convert.ToInt32(Console.ReadLine());
Console.WriteLine("\n");
Console.WriteLine("The Bill Amount is:- \t" + billamount);
Console.WriteLine("\n");
Console.WriteLine("The Recieved Amount is:- \t" + recvamount);
Console.WriteLine("\n");
calcNumberNotes();
if (returncoins < 0) {
Console.WriteLine("Changes are not Available");
} else {
Console.WriteLine("\n");
change = recvamount - billamount;
Console.WriteLine("Changes Available Are:- \t" + change);
}
Console.WriteLine("\n");
Console.WriteLine("Notes of 100:\t" + return100);
Console.WriteLine("Notes of 50:\t" + return50);
Console.WriteLine("Notes of 20:\t" + return20);
Console.WriteLine("Notes of 10:\t" + return10);
Console.WriteLine("Notes of 5:\t" + return5);
Console.WriteLine("Notes of 1:\t" + return1);
Console.WriteLine("Coins:\t" + returncoins);
Console.ReadKey();
}
}
}