Go Program to find NCR Factorial of a Number

Write a Go Program to find NCR Factorial of a Number using Functions. The math formula to calculate the NCR factorial is: First, we created a function (func factorialCal(number int)) that returns the given number factorial. Next, we call this function by passing n and r values.

package main

import "fmt"

func factorialCal(number int) int {
    factorial := 1
    for i := 1; i <= number; i++ {
        factorial = factorial * i
    }
    return factorial
}
func main() {

    var ncr, n, r int

    fmt.Print("Enter any N and R Values = ")
    fmt.Scanln(&n, &r)

    ncr = factorialCal(n) / (factorialCal(r) * factorialCal(n-r))

    fmt.Println("The NCR Factorial = ", ncr)
}

SureshMac:GoExamples suresh$ go run ncrFactorial1.go
Enter any N and R Values = 6 2
The NCR Factorial =  15
SureshMac:GoExamples suresh$ go run ncrFactorial1.go
Enter any N and R Values = 10 8 
The NCR Factorial =  45

Go Program to find NCR Factorial of a Number using Recursion

In this Golang program, we recursively call the factorialCal(number) function with the updated number.

package main

import "fmt"

func factorialCal(number int) int {
    if number == 0 || number == 1 {
        return 1
    }
    return number * factorialCal(number-1)
}
func main() {

    var ncr, n, r int

    fmt.Print("Enter any N and R Values = ")
    fmt.Scanln(&n, &r)

    ncr = factorialCal(n) / (factorialCal(r) * factorialCal(n-r))

    fmt.Println("The NCR Factorial = ", ncr)
}