Go Language - Program to Check Krishnamurthy Number

Hello everyone, today we will create a Go program to check if the given number is an Krishnamurthy number or not. Krishnamurthy number is also referred to as a Strong number.

A number is said to be Krishnamurthy if the factorial sum of all its digits is equal to that number.

For example,

Number = 40585

  = 4! + 0! + 5! + 8! + 5!

  = 1 * 2 * 3 * 4 + 1 + 1 * 2 * 3 * 4 * 5 + 1 * 2 * 3 * 4 * 5 * 6 * 7 * 8 + 1 * 2 * 3 * 4 * 5

  = 24 + 1 + 120 + 40320 + 120

  = 40585

Example 1: Go program that checks if the given number is a Krishnamurthy number or not.

/*Go program to check whether the given
 *  number is a Krishnamurthy number or not.
 */
package main
import "fmt"
// Main function
func main() {
    //sample 1
    number1 := 40585
    KrishnamurthyNumber(number1)
    //sample 2
    number2 := 13789
    KrishnamurthyNumber(number2)
    //sample 3
    number3 := 1009
    KrishnamurthyNumber(number3)
}
func KrishnamurthyNumber(number int) {
    //initialize sum to 0
    sum := 0
    //create a copy of the number
    tempNumber := number
    //perform operation until tempNumber will not equal to 0
    for tempNumber != 0 {
        /* calculate the factorial of the last digit
           of the tempNumber and then add it to the sum
        */
        sum = sum + Factorial(tempNumber%10)
        // replace the value of tempNumber by tempNumber/10
        tempNumber = tempNumber / 10
    }
    
    //If sum == number equal, number is krishnamurthy number
    if sum == number {
        fmt.Println(number, "is Krishnamurthy Number")
    } else {
        fmt.Println(number, "is not a Krishnamurthy Number")
    }
}
//Method to calculate the factorial of the number
func Factorial(number int) int {
    fact := 1
    for i := 1; i <= number; i++ {
        fact *= i
    }
    return fact
}

Output:

Example 2: Go program that checks if the number from the standard input is a Krishnamurthy number or not.

/*Go program to check whether the number from the standard input
 *  is a Krishnamurthy number or not.
 */
package main
import "fmt"
// Main function
func main() {
    var number int
    fmt.Println("Enter an integer value : ")
    _, err := fmt.Scanf("%d", &number)
    if err != nil {
        fmt.Println(err)
    }
    KrishnamurthyNumber(number)
}
func KrishnamurthyNumber(number int) {
    //initialize sum to 0
    sum := 0
    //create a copy of the number
    tempNumber := number
    //perform operation until tempNumber will not equal to 0
    for tempNumber != 0 {
        /* calculate the factorial of the last digit
        of the tempNumber and then add it to the sum
        */
        sum = sum + Factorial(tempNumber%10)
        // replace the value of tempNumber by tempNumber/10
        tempNumber = tempNumber / 10
    }
    //If sum == number equal, number is krishnamurthy number
    if sum == number {
        fmt.Println(number, "is Krishnamurthy Number")
    } else {
        fmt.Println(number, "is not a Krishnamurthy Number")
    }
}
//Method to calculate the factorial of the number
func Factorial(number int) int {
    fact := 1
    for i := 1; i <= number; i++ {
        fact *= i
    }
    return fact
}

Output: