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# Chapter 5, Making a Jigsaw Puzzle Application

## Pop-Quiz – how many bits in a byte?

Answer: 8. If only for the interest of mathematicians, it's good to know that a byte is 8 bits. A "bit" is a "binary digit", and when you start to think of bits in those terms you will see that a byte can store 2 to the power of 8 values in it ("binary" being Base 2). That came into play when looking at the length of a Pascal string (2 to the power of 8 is 256, hence the range of characters in a Pascal String is 0-255), and it helps you realize that if a picture is made up of one byte for each pixel's red, green, and blue values, it's a 24-bit picture. Once you add in another byte of data for the alpha channel, you have a 32 bit picture.

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