Swapping without 3rd Variable

Swapping Without 3rd Variable..!!

We know that Swapping it is the process of exchanging the values between the variables.

Generally in order to swap we use a 3rd variable.

The following sudo code is what the general process of swapping..!!

For example if the value of A=10 and B= 20. To swap the values we use a temporary value C.

C=A

( The value of A will be moved to C. Now C =10 and A has no values)

A=B

( Since the value of A is empty, the value of B is moved to A )

B=C

( Now the value of A that is being stored in C is moved to B ) 

the above method will swap the values of A and B with the Help of 3rd variable. 

But we can swap without the 3rd variable.

The following step will do swapping without the 3rd variable

A = A + B

( A= 10+20 i.e A = 30 )

B = A - B

( B = 30-20 i.e B = 10 )

A = A- B

( A = 30-10 i.e A=20 )

Yes now the Value of A = 20 and B =10

Our target of swapping without 3rd variable is done..:) :)

Have a great day readers

Praveen Kumar Rajendran

Chennai

General Updates June 05, 2013