C program to check whether given number is perfect or not - My CS Tutorial

In this tutorial we will learn how to write a program that check given number is perfect or not.

C program code

#include<stdio.h>

#include<conio.h>

#include<math.h>

void main()

{

  int num,a,sum=0;

  printf("\n Enter a number to know whether it is perfect or not:\n ");

  scanf("%d",&num);

  for(a=1;a<num;a++)

  {

    if(num%a==0)

    {

      sum+=a;

    }

  }

  if(sum==num)

  {

    printf("\n The given number %d is perfect.\n ",num);

  }

  else

  {

    printf("\n The given number %d is not perfect because the sum of its divisors are %d\n",num,sum);

  }

  getch();

}

OUTPUT:

In this output the value of input number is 28

Given number 28 is a perfect number because its divisors sum is equal to 28

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Created by-- HARSH CHAUHAN