Strong Number using C

Problem Statement


In this program we will code a basic program to check whether a given number is Strong number or not

If sum of factorials of digits, equals the given number,then it is STRONG else it ISN’T.

Code

 

#include

int factorial(int rem)

{

int fact=1;

int i;

for(i=1;i<=rem;i++)

{

fact=fact*i;        

}             

return fact;

}

int main()

{

int n;

int sum=0,rem=0;

int num;

printf("ENTER THE NUMBER \n");             

scanf("%d",&n);

num=n;

while(num>0)

{

rem=num%10;

sum=sum+factorial(rem);             

num=num/10;

}

if(n==sum)

{

printf("IT IS A STRONG NUMBER \n");     

}

else

{

printf("IT IS NOT A STRONG NUMBER \n");                          

}

return 0;

}

Output

ENTER THE NUMBER -> 145

IT IS A STRONG NUMBER  

Explanation 

Here, in our code we made a seperate function in order to calculate the factorial of a number.So approach is to break the given number into seperate digits,find their factorial and then add them.If sum of factorials of digits equals the given number,then it is STRONG else it ISN’T.