Write a C program to check whether given number is perfect number or Not

In this article, we will write a c program to check whether a given number is a perfect number or not.

Algorithm:

Perfect number

Step 1: read n

Step 2: assign i=1,sum=0

Step 3: while(i<n) goto step 4

Step 4: if(n%i==0)

             sum=sum+i

             i++

step 5: if(sum==n) print given number is perfect number otherwise not a perfect number. 

Write a C Program to Check Whether Given Number Is Perfect Number or Not

#include <stdio.h>

int main()
{
	int n, i = 1, sum = 0;

	printf("Enter a number: ");
	scanf("%d", &n);

	while (i < n)
	{
		if (n % i == 0)
			sum = sum + i;
		i++;
	}
	if (sum == n)
		printf("%d is a perfect number", i);
	else
		printf("%d is not a perfect number", i);

	return 0;
}

Input:

Enter a number:6

Output:

6 is a perfect number

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