Find Factorial of a Number Using Recursion in Go

Examples

Factorial of 5 = 5*4*3*2*1 = 120

Factorial of 10 = 10*9*8*7*6*5*4*3*2*1 =

Approach to solve this problem

• Step 1: Define a function that accepts a number (greater than 0), type is int.
• Step 2: If the number is 1, then return 1.
• Step 3: Otherwise, return num*function(num-1).

Program

Live Demo

package main
import "fmt"
func factorial(num int) int{
   if num == 1 || num == 0{
      return num
   }
   return num * factorial(num-1)
}
func main(){
   fmt.Println(factorial(3))
   fmt.Println(factorial(4))
   fmt.Println(factorial(5))
}

Output

6
24
120