C Program To Find All Perfect Numbers in Given Range

 PERFECT NUMBERS

Code :

#include<stdio.h>

int main()
{
    int s, n, sum = 0,no_per = 0, perf = 0;

    printf("==================================\n");
    printf("\t   PERFECT NUMBER\n");
    printf("==================================\n");

    printf("Enter lower limit number : ");
    scanf("%d", &s);
    printf("Enter upper limit number : ");
    scanf("%d", &n);
    printf("\n");

    printf("All Perfect Numbers Between %d and %d are,\n\n", s, n);
    for(int j=s; j<=n; j++)
    {
        sum = 0;
        for(int i=1; i<j; i++)
        {
            if(j%i == 0)
            {
                sum += i;
            }
        }
        if(sum == j)
        {
            printf("%d ", j);
        }
        else
        {
            no_per++;
        }
    }
   
    if(no_per == ((n-s)+1))
    {
         printf("No Perfect Numbers in given range !!");
    }
    printf("\n----------------------------------\n");
    return 0;
}

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