# 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``````