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)

x=1;

else

x=0;

 

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

x=1-x;

 

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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