Understanding the HCF Algorithm in C#
This C# program calculates the HCF (Highest Common Factor) using user input and
the Fast HCF C# Code from the previous lesson.
Let's add some input mechanism so our user enters the set of
numbers whose H.C.F. we are to find.
Combining the H.C.F. (G.C.D.) C# Code and Collecting User Input
All we need is a main C# code that asks the user for input.
For this purpose, we'll use the Console.ReadLine()
library function.
How to use the HCF Code in C#
The user gets to enter his/her choice of numbers for the HCF C# algorithm.
After entering each number, the user presses <Enter>.
After the user has entered every of his/her numbers, the
user enters the word done
to see the result.
Note: You can comment out the C# code for the main class from the previous lesson if you have been following.
So! C# Fun Practice Exercise - Find HCF with User Input
As a fun practice exercise, feel free to try out your own numbers, and see how the C# code finds the HCF of your input numbers.
C# Code for HCF with User Input - Main Class.
using System.Collections.Generic;
using System.Text.RegularExpressions;
namespace Arithmetic
{
class Program
{
static void Main(string[] args)
{
Console.WriteLine("Welcome to our demonstration sequels");
Console.WriteLine("Hope you enjoy (and follow) the lessons.");
Console.WriteLine("\r\n");
/*
* Collect input.
*/
// Collect input
string collect_input; // For collecting user input
List<int> set = new List<int>();
Console.WriteLine("Welcome to our Find H.C.F. program.");
Console.WriteLine("Enter your series of number for H.C.F.");
Console.WriteLine("Type 'done' when you are through with entering your numbers.\n");
string collect_input_text = "Enter First Number: ";
try
{
do
{
// Get keyboard input
Console.Write(collect_input_text);
collect_input = Console.ReadLine();
if (Regex.IsMatch(collect_input, @"[0-9]+"))
{
if (int.Parse(collect_input) != 0)
{
set.Add(int.Parse(collect_input));
collect_input_text = "Enter Next Number: ";
}
else
{
Console.WriteLine("You cannot enter zero. Repeat that!Type 'done' when you're finished.");
}
}
else if (!"DONE".Equals(collect_input.ToUpper()))
{
Console.WriteLine("Wrong Input. Repeat that!\r\n Type 'done' when you're finished.");
}
} while (!"DONE".Equals(collect_input.ToUpper()));
}
catch (Exception e) {
Console.WriteLine(e.Message);
}
FastHCF h_c_f = new FastHCF(set);
Console.WriteLine("The H.C.F. of " + String.Join(", ", set) + " is " + h_c_f.getHCF());
}
}
}