1-6-12
Input
kUsing Single-character Variables
As its name suggests, a single-character variable is a variable name that consists of a single character like “a” or “x”. Input of single-character variable names is subject to different rules than input of a series of multiple characters (like “abc”).
uTo input a single-character variable name
Any character you input using any one of the following techniques is always treated as a single-character variable.
•Tapping any key in the math (mth) keyboard’s V key set (page 1-6-10)
•Tapping any key in the 2D keyboard’s V key set (page 1-6-15)
•Tapping the X, Y, Zor [key to the left of the 9key of the math (mth) keyboard or 2D keyboard
•Pressing the x, y, or Zkeypad key
If you use the above key operations to input a series of characters, each one is treated as a single-character variable. Inputting A, B, C, for example, is treated as the mathematical expression a ⋅ b ⋅ c, and not as the characters “abc”.
Tip
•The single-character variables described above make it possible for you to perform calculations as they are written in your textbook.
Example 1: 9VABCw
Example 2: 2xyE
Tip
•When you input a single-character variable, its name appears on the display as an italicized bold character. This is simply to let you know that the letter is a single-character variable name.