# Program to swap two numbers without using the third variable

Program to swap two numbers without using the third variable on fibonacci, factorial, prime, armstrong, swap, reverse, search, sort, stack, queue, array, linkedlist, tree, graph, pattern, string etc.

## Program to swap two numbers without using the third variable

This program is to swap/exchange two numbers without using the third number in the way as given below:

Example: Suppose, there are two numbers 25 and 23.

Let

```X= 25 (First number), Y= 23 (second number)
Swapping Logic:
X = X + Y = 25 +23 = 48
Y = X - Y = 48 - 23 = 25
X = X -Y = 48 - 25 = 23
and the numbers are swapped as X =23 and Y =25.
```

### Algorithm

• STEP 1: START
• STEP 2: ENTER x, y
• STEP 3: PRINT x, y
• STEP 4: x = x + y
• STEP 5: y= x - y
• STEP 6: x =x - y
• STEP 7: PRINT x, y
• STEP 8: END

### Java Program

```import java.util.*;
class Swap
{
public static void main(String a[])
{
System.out.println("Enter the value of x and y");
Scanner sc = new Scanner(System.in);
/*Define variables*/
int x = sc.nextInt();
int y = sc.nextInt();
System.out.println("before swapping numbers: "+x +"	"+ y);
/*Swapping*/
x = x + y;
y = x - y;
x = x - y;
System.out.println("After swapping: "+x +"	" + y);
}
}
```

Output:

```Enter the value of x and y
23  43
before swapping numbers: 23  43
After swapping:  43  23
```

### C Program

```#include<stdio.h>
int main()
{
int x, y;
printf("Enter the value of x and y?");
scanf("%d %d",&x,&y);
printf("before swapping numbers: %d   %d\n",x,y);

/*swapping*/
x = x + y;
y = x - y;
x = x - y;
printf("After swapping: %d    %d",x,y);
return 0;
}
```

Output:

```Enter the value of x and y?
13
22
before swapping numbers:  13  22
After swapping:  22  13
```

### C# Program

```using System;
class swap {
public static void Main()
{
Console.WriteLine("Enter the value of x and y");
Console.WriteLine("before swapping numbers: "+x +"	"+ y);
/*swapping*/
x = x + y;
y = x - y;
x = x - y;
Console.WriteLine("After swapping: "+x +"	" + y);

}
}
```

Output:

```Enter the value of x and y
213
432
before swapping numbers: 213   432
After swapping:  432   213
```

### Python Program

```x = int(input("Enter the value of x?"))
y = int(input("Enter the value of y?"))
print("before swapping numbers: %d   %d\n" %(x,y))
#swapping#
x = x + y
y = x - y
x = x - y
print("After swapping: %d   %d\n"%(x,y))
```

Output:

```Enter the value of x?
12
Enter the value of y?
24
before swapping numbers:  12   24
After swapping:  24   12
```

### PHP Program

```<?php
echo "Enter the value of x";
echo "Enter the value of y";
echo "before swapping numbers: ";
echo \$x;
echo "    ";
echo \$y;
echo "\n";

/*swapping*/
\$x = \$x + \$y;
\$y = \$x - \$y;
\$x = \$x - \$y;
echo "After swapping ";
echo \$x;
echo "    ";
echo \$y;
?>
```

Output:

```Enter the value of x   55
Enter the value of y   46
before swapping numbers:  55  46
After swapping  46  55
```
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