Unions and Structures Explained

Share this post!

Vote this!

What is a Union?

If we are having the less memory to use in our program, for example 64K, we can use a single memory location for more than one variable this is called union.
You can use the unios in the followig locations.

1. You can share a single memory location for a variable myVar1 and use the same location for myVar2 of different data type when myVar1 is not required any more.
2. You can use it if you want to user, for example, a long variable as two short type variables.
3. When you dont know what type of data is to be passed to a function, and you pass union which contains all the possible data types.  more...