C program to check the given number is a strong number or not

When the sum of the factorial of a number’s individual digits is equal to the number itself, then we can say that number is called a strong number.

For example: 145 is a strong number
Since, 1! + 4! + 5!
= 145

So, let’s move forward to our code:

#include <stdio.h>
#include<conio.h>
void main()  
{  
    int i, num, num1, s1=0,j;
    long facto;
    //clrscr();
printf("\n...Welcome To EduNews.Tech... ");
     printf("\n\nCheck whether a number is Strong Number or not:\n ");
     
/* If sum of factorial of digits is equal to original number then it is Strong number */
    printf("Enter a number to check it is Strong number: ");  
    scanf("%d", &num);  
    num1 = num;  
    for(j=num;j>0;j=j/10) 
    {   
    facto = 1;
        for(i=1; i<=j % 10; i++)  
        {  
            facto = facto* i;  
        }  
         s1 = s1 + facto;   
    }    
    if(s1==num1)  
    {  
    printf("%d is Strong number.\n", num1);
    }
    else
    {
    printf("%d is not Strong number.\n", num1);

    }
    printf("\n\n\n\t\t\tThankyou for Joining Us !");
    printf("\n\t\t\t!Regards EduNews !");
    getch();
}

Program Output:

I hope this post helps you to understand Strong number and its implementation in C programming language.

Keep coding 🙂