C Program to Dispaly Strong Numbers between Two Intervals

#include<stdio.h>

#include<conio.h>

int factorial(int);

void main()

{

    int num1,num2,i,k,rem,strong;

    printf("Enter interval (two numbers): ");

    scanf("%d%d",&num1,&num2);

    printf("Strong numbers between %d and %d are:\n",num1,num2);

    for(i=num1;i<=num2;i++)

    {

        k=i;

        strong=0;

        while(k>0)

        {

            rem=k%10;

            strong=strong+factorial(rem);

            k=k/10;

        }

        if(i==strong)

            printf("%d\n",i);

    }

    getch();

}

int factorial(int r)

{

    int i,f=1;

    for(i=r;i>=1;i--)

    {

        f=f*i;

    }

    return f;

}

OUTPUT:

C Program to Check Whether a Number can be Expressed as Sum of Two Prime Numbers >>