Java Program to Swap Two Numbers
Java Program to Swap Two Numbers
In programming, there are two different techniques to swap any two numbers in a variable, they are
- Swap using Temporary Variable
- Swap without using Temporary Variable
Swap using Temporary Variable
In the following example, we will swap two numbers (25 and 50) using a temporary variable (temp).
Example
public class myClass
{
public static void main(String[] args)
{
int num1 = 25;
int num2 = 50;
int temp = 0;
temp = num1;
num1 = num2;
num2 = temp;
System.out.println("After swapping...");
System.out.format("\nnum1 = %d", num1);
System.out.format("\nnum2 = %d", num2);
}
}
Output
After swapping...
num1 = 50
num2 = 25
Swap without using Temporary Variable
In the following example, we will swap two numbers (25 and 50) without using a temporary variable.
Example
import java.util.Scanner;
public class myClass
{
public static void main(String[] args)
{
int num1 = 25;
int num2 = 50;
num1 = num1 - num2;
num2 = num1 + num2;
num1 = num2 - num1;
System.out.println("After swapping...");
System.out.format("\nnum1 = %d", num1);
System.out.format("\nnum2 = %d", num2);
}
}
Output
After swapping...
num1 = 50
num2 = 25
Swap any Two Given Numbers
In the following example, we will swap any two given numbers without using a temporary variable (temp).
Example
import java.util.Scanner;
public class myClass
{
public static void main(String[] args)
{
Scanner reader = new Scanner(System.in);
System.out.print("Enter a (int) Number1: ");
int num1 = reader.nextInt();
System.out.print("Enter a (int) Number2: ");
int num2 = reader.nextInt();
int temp = 0;
temp = num1;
num1 = num2;
num2 = temp;
System.out.print("\nAfter swapping...");
System.out.format("\nnum1 = %d", num1);
System.out.format("\nnum2 = %d", num2);
}
}
Output
Enter a (int) Number1: 25
Enter a (int) Number2: 36
After swapping...
num1 = 36
num2 = 25
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