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C# Program to find Factorial of a number


In this post today we are going to see two different program in first program we are going to find factorial of a number using for loop and in the other program  we are going to find the factorial using do-while  loop.And it will be a console application which accept a number from the user and give the factorial of number as  output.

Before moving to actually making our factorial console application, let us take look on the two looping statements which we are going to use in our application

1.For Loop (Entry Control Loop)


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for(init;condition;increment)
{
   //statements to be executed.
}
Here init is the initialization part of thee for loop where you can initialize the variable. which your age going to use at any  value according to your requirement or we can say that the loop will start from that point.Init will be checked once we the loop start execution.

 Condition  is the part which  will be checked to enter the for loop.If the condition is satisfied then and only then the statements inside the for loop are executed.Otherwise the statements are skipped.

After the control statements executed the control jump back to  increment to update loop control variables.
Check More on Foor Loop:

2.Do-While Loop (Exit Control Loop)


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do
{
    //statements
      increment
}
while(Condition)

Here in do-while loop all the statements inside the loop are executed once and the condition is checked at the end of the loop.
Check More on Do-while Loop:




Now let's move towards making our console application.Select the new console application under Visual C#.You can name it what ever you like, i'm going to name it "Factorial App".


Now there is no need to add any extra name space.You can just start writing program in   the main method.First we are going to make program  using for loop.

Using For Loop:

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            int i=0;
            int fact = 1;
            Console.WriteLine("Enter Number");
            i = Convert.ToInt16(Console.ReadLine());

            do
            {

                fact = fact * i;
                i--;

            } while (i != 0);

        }
    }
}

Using Do-while loop:


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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication2
{
    class Program
    {
        static void Main(string[] args)
        {
            int i = 0;
            int fact = 1;
            Console.WriteLine("Enter Number");
            i = Convert.ToInt16(Console.ReadLine());

            for (int j = 0; j < i;j++ )
            {

                fact = fact * i;

            } 
        }
    }
}

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Code Download:

        1.Using For loop:      
         
        2.Using Do-while loop

                                                 

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