C# Sharp Exercises: Find perfect numbers within a given range of number

C# Sharp For Loop: Exercise-28 with Solution

Write a C# Sharp Program to find the perfect numbers within a given range of number.

Pictorial Presentation:

Sample Solution:

C# Sharp Code:

/*Perfect number is a positive number which sum of all positive divisors excluding*/ 
/*that number is equal to that number. For example 6 is perfect number since divisor of 6 are 1, 2 and 3.*/
/*Sum of its divisor is 1 + 2+ 3 = 6*/
using System;  
public class Exercise28 
{  
    public static void Main()
{
  int n,i,sum;
  int mn,mx;
  
	Console.Write("\n\n");
    Console.Write("Find perfect numbers within a given number of range:\n");
    Console.Write("------------------------------------------------------");
    Console.Write("\n\n");    
  
  Console.Write("Input the starting range or number : ");
  mn = Convert.ToInt32(Console.ReadLine());  
  Console.Write("Input the ending range of number : ");
  mx = Convert.ToInt32(Console.ReadLine());  
  Console.Write("The Perfect numbers within the given range : ");
  for(n=mn;n<=mx;n++)
    {
    i=1;
    sum = 0;
    while(i<n)
	{
      if(n%i==0)
           sum=sum+i;
          i++;
    }
    if(sum==n)
      Console.Write("{0} ",n);
    }
      Console.Write("\n");
 }  
}

Sample Output:

Find perfect numbers within a given number of range:                                                                                                         
------------------------------------------------------                                                                                                         
Input the starting range or number : 1                                                                                                         
Input the ending range of number : 20                                                                                                         
The Perfect numbers within the given range : 6   

Flowchart:

C# Sharp Code Editor:

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