C and C++ Programs to Check Whether a Number is Strong Number or Not

This post contains C and C++ program to check whether a given number is Strong number or not. A strong number is a number for which the sum of factorials of its digits is equal to the number itself. The first one is C program to check whether the input number is a strong number or not. An example is 145. 1!+4!+5!=1+24+120=145 Therefore 145 is a strong number.

C Program:

#include<stdio.h>
long int factorial(int n)
{
 if (n == 0)
  return 1;
 else
  return (n * factorial(n - 1));
}

void main()
{
 int n, t;
 int sum = 0;
 printf("\nEnterthe number");
 scanf("%i", &n);
 t = n;
 while (t != 0)
 {
  sum += factorial(t % 10);
  t /= 10;
 }

 if (sum == n)
  printf("\nIt is a Strong number");
 else
  printf("\nIt is not a Strong number");
}