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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

Output:

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

C Program

Output:

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

C# Program

Output:

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

Python Program

Output:

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

PHP Program

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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