Go - Factorial Program using loop

We can find the factorial of a number n by multiplying it with its predecessors up to 1. For example, if we have to find factorial of 4, the equation will look like this:

  4! = 4*3*2*1 = 24.

We can find the factorial of a number n by multiplying it with its predecessors up to 1. For example, if we have to find factorial of 4, the equation will look like this:

Example 1. Go program to find factorial of a given number,

package main
import "fmt"
func main() {
    number := 5
    fmt.Println("Factorial of the number:", Factorial(number))
}
func Factorial(number int) int {
    fact := 1
    for i := 1; i <= number; i++ {
        fact *= i
    }
    return fact
}

Output:

Example 2. Go program to find factorial of a number from standard input,

package main
import "fmt"
func main() {
    var number int
    fmt.Println("Enter an integer value : ")
    _, err := fmt.Scanf("%d", &number)
    if err != nil {
        fmt.Println(err)
    }
    fmt.Println("Factorial of the number:", Factorial(number))
}
func Factorial(number int) int {
    fact := 1
    for i := 1; i <= number; i++ {
        fact *= i
    }
    return fact
}

Output: