# Strong Numbers in a Given Range in C

## Strong Number in a Given Range

Today in this page we will be discussing the code to find the Strong Numbers in a Given Range in C  programming language.

Strong number is a special number whose sum of the factorial of digits is equal to the original number.

For Example: 145 is strong number. Since, 1! + 4! + 5! = 145.

The idea is to iterate from (1, N)  and check if any number between the range is a strong number or not. If yes then print the corresponding number, else we need to check for the next number.
Let’s understand this with help of some examples

Input: N = 100
Output: 1 2
Explanation:
Only 1 and 2 are the strong numbers from 1 to 100 because
1! = 1, and
2! = 2

Input: N = 1000
Output: 1 2 145
Explanation:
Only 1, 2 and 145 are the strong numbers from 1 to 1000 because
1! = 1,
2! = 2, and
(1! + 4! + 5!) = 145

## Strong Numbers in a Given Range C Code

Run
```#include <stdio.h>
int main() {
int i, n, n1, s1 = 0, j, k, en, sn;
long fact;

printf("Find Strong Numbers within an range of numbers:\n");
/* If sum of factorial of digits is equal to original number then it is Strong number */
sn = 1;
en = 150;

for (k = sn; k <= en; k++) {
n1 = k;
s1 = 0;

for (j = k; j > 0; j = j / 10) {
fact = 1;

for (i = 1; i <= j % 10; i++) {
fact = fact * i;
}
s1 = s1 + fact;
}
if (s1 == n1) printf("%d  ", n1);
}
printf("\n");
return 0;
}```
```Find Strong Numbers within an range of numbers:
1 2 145```