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How to write Sum Program in C# ?

  • The C# Program Gets a Number and Display the Sum of the Digits. The digit sum of a given integer is the sum of all its digits.
  • We can write the sum of digits program in C# language by the help of loop and mathematical operation only.
 C# Sum

C# Sum

Sum of digits algorithm

  • To get sum of each digit by C# program, use the following algorithm:
    • Step 1: Get number by user
    • Step 2: Get the modulus/remainder of the number
    • Step 3: sum the remainder of the number
    • Step 4: Divide the number by 10
    • Step 5: Repeat the step 2 while number is greater than 0.
  • Let's see the sum of digits program in C#

Example 1:

using System;  
  	public class SumExample  
   {  
     public static void Main(string[] args)  
      {  
       int  n,sum=0,m;         
       Console.Write("Enter a number: ");      
       n= int.Parse(Console.ReadLine());     
       while(n>0)      
       {      
        m=n%10;      
        sum=sum+m;      
        n=n/10;      
       }      
       Console.Write("Sum is= "+sum);       
     }  
  } 
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C# examples - Output :

Enter a number: 23  
Sum is= 5
Enter a number: 624       
Sum is= 12

Example 2:

/*
 * C# Program to Get a Number and Display the Sum of the Digits 
 */
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
 
namespace Program
{
    class Program
    {
        static void Main(string[] args)
        {
            int num, sum = 0, r;
            Console.WriteLine("Enter a Number : ");
            num = int.Parse(Console.ReadLine());
            while (num != 0)
            {
                r = num % 10;
                num = num / 10;
                sum = sum + r;
            }
            Console.WriteLine("Sum of Digits of the Number : "+sum);
            Console.ReadLine();
 
        }
    }
}
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C# examples - Output :

Enter a Number: 123
Sum of Digits of the Number: 6


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