C program to print perfect numbers till N - My CS Tutorial

In this tutorial we will learn how to write a c language program that print all perfect numbers between 1 to 500 or till n(given numbers).

C program code

#include<stdio.h>

#include<conio.h>

#include<math.h>

void main()

{

  int num,a,b,sum;

  printf("\n Enter a number to know all perfect numbers till n:\n ");

  scanf("%d",&num);

  printf("\n The perfect numbers between 1 and %d are:\n",num);

  for(a=1;a<=num;a++)

  {

    sum=0;

    for(b=1;b<a;b++)

    {

      if(a%b==0)

      {

        sum+=b;

      }

    }

    if(sum==a)

    {

      printf(" %d\n",a);

    }

  }

  getch();

}

OUTPUT:

In this output the range of numbers to check perfect numbers is 500

And the perfect numbers between 1 and 500 is 

6, 28, 496

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Created by-- HARSH CHAUHAN