ASCII is a standard binary code for alphanumeric numbers. It uses seven bits1 to encode 128 characters.

Below is a table for ASCII conversions.2 3

Footnotes

  1. Since computers store in bytes, the most significant bit is usually a 0.

  2. From Logic and Computer Design Fundamentals, by Mano and Kime.

  3. From Problem Solving with C++, by Walter Savitch.