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Golang program to calculate the factorial of given number using for loop

Here, we are going to learn how to calculate the factorial of given number using for loop in Golang (Go Language)?
Submitted by Nidhi, on March 06, 2021 [Last updated : March 03, 2023]

Calculating the factorial in Golang

Problem Solution:

In this program, we will read an integer number and calculate the factorial of the given number and print the result on the console screen.

Program/Source Code:

The source code to calculate the factorial of a given number using the for loop is given below. The given program is compiled and executed successfully.

Golang code to calculate the factorial of given number using for loop

// Golang program to calculate the factorial of given number
// using "for" loop.

package main

import "fmt"

func main() {
	var num int = 0
	var fact int = 1

	fmt.Print("Enter Number: ")
	fmt.Scanf("%d", &num)

	for count := 2; count <= num; count++ {
		fact = fact * count
	}

	fmt.Println("Factorial is: ", fact)
}

Output:

Enter Number: 5
Factorial is:  120

Explanation:

In the above program, we declare the package main. The main package is used to tell the Go language compiler that the package must be compiled and produced the executable file. Here, we imported the fmt package that includes the files of package fmt then we can use a function related to the fmt package.

In the main() function, we created two variables num, fact that are initialized with 0,1 respectively. Here, we calculated the factorial of a given number and printed the result on the console screen.