In this article, we are going to learn about code and algorithm to find the factorial of a number in go golang. We will implement factorial of a number code using for loop and recursion.
There are many ways to find the factorial of a number in go golang.
1:) Using for loop
Algorithm:
- Get the number as input from user
- Run for loop from 1 to up to number
- Calculate factorial
Code:
package main
import "fmt"
func main() {
var n int
var fact int = 1
fmt.Print("Enter the Number: ")
fmt.Scan(&n)
if (n < 0) {
fmt.Print("\nFactorial of a negative number is not possible")
}
for i := 1; i <= n; i++ {
fact = fact * i
}
fmt.Printf("\nFactorial is %d", fact)
}2:) Using recursion
Algorithm:
- Get the number as input from user
- Do recursive call to get factorial number
- Return the factorial value
Code:
package main
import "fmt"
func factorial(n int) int {
if (n == 1) {
return 1
}
return n * factorial(n-1)
}
func main() {
var n int
fmt.Print("Enter the Number: ")
fmt.Scan(&n)
if (n < 0) {
fmt.Print("\nFactorial of a negative number is not possible")
}
result := factorial(n)
fmt.Printf("\nFactorial is %d", result)
}Output:
Enter the Number: Factorial is 120
Reference:
https://en.wikipedia.org/wiki/Factorial
To learn more about golang, please follow given below link:
https://techieindoor.com/go-lang-tutorial/