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Golang - Demonstrate the concept of direct recursion Code Example

The code for Demonstrate the concept of direct recursion

package main

import (
	"fmt"
)

func calculateFactorial(number int) int {
	if number == 0 || number == 1 {
		return 1
	}
	if number < 0 {
		fmt.Println("Invalid number")
		return -1
	}
	return number*calculateFactorial(number - 1)
}


func main() {
	result1 := calculateFactorial(0)
	fmt.Println(result1, "\n")
	
	result2 := calculateFactorial(5)
	fmt.Println(result2, "\n")
	
	result3 := calculateFactorial(-1)
	fmt.Println(result3, "\n")
	
	result4 := calculateFactorial(10)
	fmt.Println(result4, "\n")
}

/*
Output:
1 

120 

Invalid number
-1 

3628800
*/