Perfect Number is a number which is equal to sum of it’s proper divisors.
Example 1: 6 has proper divisors 1,2,3. 1+2+3 = 6. Hence it is a Perfect Number.
Example 2: 10 has proper divisors 1,2,5. 1+2+5 != 6. Hence it is not a Perfect Number.
C
#include <stdio.h>
void main()
{
int n=0,sum=0;
printf("Enter a number: ");
scanf("%d",&n);
for(int i=1;i<n;i++)
{
if(n%i==0)
{
sum=sum+i;
}
}
if(sum==n)
{
printf("%d is a Perfect Number",n);
}
else
{
printf("%d is not a Perfect Number",n);
}
}