Swap 0 and 1

Just assume that you have a flag which will store either 0 or 1. At one stage you have to check the value of the flag and swap it. i.e. if it has 0 change it to 1 and if it has 1 change it to 0. How do you do this ?


Assuming that the variable is x, in Java or C#, normally you will write it as follows.


if (x==0)





but there is a fantastic shortcut. Why don’t you write it as follows?



Why don’t you try out to use the same logic to swap any two numbers?

This entry was posted in 05. කෙටි ක්‍රම. Bookmark the permalink.

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