Go – Factorial Program using For Loop

In this tutorial, we will write a program to compute factorial of a number using for loop.

In the following program, we write a function factorial, that takes an integer n and returns the factorial of this integer. If n is zero, return 1, else, iterate using for loop from 1 to n, compute the factorial and return the result.

example.go

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package main

import "fmt"

func factorial(n int) int {
	if n == 0 {
		return 1
	}
	result := 1
	for i := 1; i <= n; i++ {
		result *= i
	}
	return result
}

func main() {
	n := 5
	result := factorial(n)
	fmt.Println("Factorial of", n, "is :", result)
}

Output

Factorial of 5 is : 120

Conclusion

In this Golang Tutorial, we learned how to write a Go program to compute factorial of a number using for loop.