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Go Program to Calculate Factorial Value
Go Program to Calculate Factorial Value of a Number
This go program is used to find the factorial value for a number which is provided by user input.
Factorial Algorithm
Factorial of a Number = 1*2* .... (Number-1)*Number.
Go Programming Example to Calculate Factorial Value using Recursion
Recursive function is a function which calls itself.
This go program is used to find the factorial value using recursive function.
package main
import "fmt"
func factorial(num int) int {
if num > 1 {
return (num * factorial(num-1))
} else {
return 1
}
}
func main() {
var num, factorial_val int
factorial_val = 1
fmt.Print("Enter number: ")
fmt.Scanf("%d", &num)
if num < 0 {
fmt.Println("\nError - negative number!")
} else {
factorial_val = factorial(num)
fmt.Printf("Factorial of %d: %d\n", num, factorial_val)
}
}
Output:
]$ go build factorial.go $ ./factorial Enter number: 6 Factorial of 6: 720 $ ./factorial Enter number: -1 Error - negative number!
Go Programming Example to Calculate Factorial Value using for loop
This go program is used to calculate the factorial value for a number which is provided as user input. and also uses for loop to compute the factorial value.
package main
import "fmt"
func factorial(num int) int {
var fact_val = 1
for i:=1;i<=num;i++ {
fact_val = fact_val * i
}
return fact_val
}
func main() {
var num, factorial_val int
factorial_val = 1
fmt.Print("Enter number: ")
fmt.Scanf("%d", &num)
if num < 0 {
fmt.Println("\nError - negative number!")
} else {
factorial_val = factorial(num)
fmt.Printf("Factorial of %d: %d\n", num, factorial_val)
}
}
Output:
]$ go build factorial.go $ ./factorial Enter number: 4 Factorial of 4: 24 $ ./factorial Enter number: -6 Error - negative number!
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Go Programming Calculates Factorial Value
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