## Description

## Write a c program to check that given number is a strong number or not.

**What is Storng Number?**

**Strong number **is a number whose sum of the factorial of digits of number is equal to given number.

For Example :

145 is a **strong number.**

Let's Check this number is **strong number or not.**

1! + 4! + 5! = 1 + 24 + 120 = 145.

So 145 is a **Strong number.**

Let's code...

```
#include<stdio.h>
int factorial(int i);
int main(){
int n;
printf("Enter the Number : ");
scanf("%d", &n);
int temp = n, sum = 0;
while(temp>0){
int digit = temp%10;
sum = sum + factorial(digit);
temp = temp / 10;
}
if(sum == n){
printf("%d is a Strong Number", n);
}else{
printf("%d is not Strong Number", n);
}
return 0;
}
int factorial(int i){
int fact = 1;
for(int j=1; j<=i; j++){
fact = fact * j;
}
return fact;
}
```

**Output :**

Enter the Number : 145

145 is a Strong Number

**How it's work?**

**Step 1 : **Start the program

**Step 2 : **Include header file "stdio.h"

**Step 3 : **Declare a function (for calculate the factorial)

**Step 4 : **Start main() function

**Step 5 : **Initilized a variable n, which store the given number by user for checking the **strong number.**

**Step 6 : **Print message for user.

**Step 7 : **Take input from scanf() function.

**Step 8 : **Initilized another variable temp and sum , temp is used for temparory variable which store the original number and sum is used for store the ans whose initial assigned zeor(0).

**Step 9 : **Start a while loop, and here given the condition when ( temp > 0 ) , when condition is true then execute the loop body statement Repeate all (Step10, 11, 12).

**Step 10 : **Initilized a varialbe digit , whose store the last digit of the number.

**Step 11 : **Execute this sum = sum + factorial(digit);

When factorial(digit) is called then go to the this function defination.

**Step 12 : **Remove the last digit , with the help of this ( temp = temp / 10 ).

**Step 13 : **Check that given number is equal to sum, if the condition is true then print given number is a **Strong Number** otherwise both are not equal then print given number is not a **strong number.**

**Step 14 : **return 0 (Exit).

Explain the factorial function :

In factorial function , initilized a variable fact and assigned the value 1. Start for loop , in for loop we initilized a variable j = 1 and the condition is j<=i and increament the value of j by 1. And perform the operation after goes to loop body this expression ( fact = fact * j). When loop is terminated. then we return the value of fact.

**Thanks...**

**Please comments**

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