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Go Program to Reverse a Number

by suresh

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 1

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)
}
Go Program to Reverse a Number 2

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)
}
Golang Program to Reverse a Number 3

Placed Under: Go Examples

  • Golang Hello World Program
  • Go Add Two Number
  • Go Compound Interest
  • Go Count Digits in a Number
  • Go Cube of a Number
  • Go Even or Odd
  • Go Largest of Three Numbers
  • Go Reverse Natural Numbers
  • Go Multiplication Table
  • Go Number divisible by 5 and 11
  • Go Positive or Negative
  • Go Power of a Number
  • Go Print Natural Numbers
  • Go Profit or Loss
  • Go Print 1 to 100 without loop
  • Go Program to Print 1 to 100
  • Go Product of Digits in a Number
  • Go Palindrome Number Program
  • Go Print Even Numbers
  • Go Print Odd Numbers
  • Go Factors of a Number
  • Go Perfect Number
  • Go Prime Number
  • Go Reverse a Number
  • Go Simple Interest
  • Go Square of a Number
  • Go Square root of a Number
  • Go Sum of Digits in a Number
  • Go Sum & Avg of Natural Nums
  • Go Sum of Even Numbers
  • Go Sum of Odd Numbers
  • Go Sum of Even and Odd
  • Go Sphere Vol & Surface Area
  • Go Cylinder Vol & Surface Area
  • Go Cuboid Vol & Surface Area
  • Go Cube Volume & Surface Area
  • Go Cone Volume & Surface Area

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