For Example Swap A and B (A = 2000 , B = 2001)
Start Algorithm
Store 0 in num1, num2;
Display ("Enter the num1:")
Read num1
num1 = num1 + num2
num2 = num1 - num2
num1 = num1 - num2
Display num1
Display num2
Stop
Output: A = 2001 , B = 2000