Question

How to check if a number is a strong number in Go

Answer 1

// Strong numbers are the numbers that the sum of factorial of its digits
// is equal to the original number

// 145 is a strong number: 1 + 24 + 120 = 145

package main

import (
	"fmt"
)

func factorial(n int) int {
	fact := 1
	
	for i := 2; i <= n; i++ {
		fact *= i
	}
	
	return fact
}

func main() {
	n := 145
	reminder, sum, tmp := 0, 0, n

	for n != 0 {
		reminder = n % 10
		sum += factorial(reminder)
		n /= 10
	}

	if sum == tmp {
		fmt.Printf("%d is a strong number\n", tmp)
	} else {
		fmt.Printf("%d is not a strong number\n", tmp)
	}
}


/*
run:

145 is a strong number

*/

 

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