Write a Golang program to swap two numbers without using a third variable


Approach to solve this problem

  • Step 1: Define a function that accepts two numbers, type is int.
  • Step 2: Find b = a + b;
  • Step 3: Then a = b – a and b = b – a

Program

Live Demo

package main
import "fmt"

func swap(a, b int){
   fmt.Printf("Before swapping, numbers are %d and %d\n", a, b)
   b = a + b
   a = b - a
   b = b - a
   fmt.Printf("After swapping, numbers are %d and %d\n", a, b)
}

func main(){
   swap(23, 45)
   swap(56, 100)
}

Output

Before swapping, numbers are 23 and 45
After swapping, numbers are 45 and 23
Before swapping, numbers are 56 and 100
After swapping, numbers are 100 and 56

Updated on: 04-Feb-2021

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