# Go Program to Reverse a Number

Write a Go Program to Reverse a Number using for loop. The for loop condition make sure the number is greater than zero. Within the loop (for revnum > 0),

• remainder = revnum % 10 – Assigning the last digit in a number to the remainder.
• reverse = reverse * 10 + remainder – Multiplies the reverse value with ten and adds the remainder value to it.
• revnum = revnum / 10 – Removes the last digit from the revnum
```package main

import "fmt"

func main() {

var revnum, remainder int

fmt.Print("Enter the Number to Reverse = ")
fmt.Scanln(&revnum)

reverse := 0

for revnum > 0 {
remainder = revnum % 10
reverse = reverse*10 + remainder
revnum = revnum / 10
}

fmt.Println("The Reverse of the Given Number = ", reverse)
}```

## Go Program to Reverse a Number using Functions

```package main

import "fmt"

func numberReverse(revnum int) int {
var remainder int
reverse := 0

for ; revnum > 0; revnum = revnum / 10 {
remainder = revnum % 10
reverse = reverse*10 + remainder
}
return reverse
}
func main() {

var revnum int

fmt.Print("Enter the Number to Reverse = ")
fmt.Scanln(&revnum)

reverse := numberReverse(revnum)

fmt.Println("The Reverse of the Given Number = ", reverse)
}```
``````SureshMac:GoExamples suresh\$ go run reversenum2.go
Enter the Number to Reverse = 3487
The Reverse of the Given Number =  7843
SureshMac:GoExamples suresh\$ go run reversenum2.go
Enter the Number to Reverse = 90764
The Reverse of the Given Number =  46709``````

In this Golang example, we declared a recursive function to reverse the given number. Here, number_reverse (revnum / 10) calls the number_reverse() function recursively.

```package main

import "fmt"

var reverse int = 0

func numberReverse(revnum int) int {

var remainder int

if revnum <= 0 {
return 0

}
remainder = revnum % 10
reverse = reverse*10 + remainder
numberReverse(revnum / 10)
return reverse
}
func main() {

var revnum int

fmt.Print("Enter the Number to Reverse = ")
fmt.Scanln(&revnum)

reverse := numberReverse(revnum)

fmt.Println("The Reverse of the Given Number = ", reverse)
}```
``````SureshMac:GoExamples suresh\$ go run reversenum3.go
Enter the Number to Reverse = 3098
The Reverse of the Given Number =  8903
SureshMac:GoExamples suresh\$ go run reversenum3.go
Enter the Number to Reverse = 390754
The Reverse of the Given Number =  457093`````` Suresh is the founder of TutorialGateway and a freelance software developer. He specialized in Designing and Developing Windows and Web applications. The experience he gained in Programming and BI integration, and reporting tools translates into this blog. You can find him on Facebook or Twitter.