Radio Shack TRS-80 PC-3

"HELLO"
"GOODBYE"
"RADIO SHACK PC-3"
The following are not valid string constants:
"COMPUTER
"ISN"T"
Variables
No ending quote
Quote can't be used within a string
In addition to constants, whose values do not change during a program, BASIC has variables, whose values can change. Variables
are
names used to designate locations where information is stored. These variables are like the letters used in algebraic equations.
Just as there are numeric and string constants, there are numeric and string variables.
Simple Numeric Variables
You have already used simple numeric variables when working with the PC-3 as a calculator in Chapter 3. Simple numeric variables
are used
to store a single number and are designated by a single letter (A-Z):
A 5
C 12.345
Simple numeric variables may take the same range of values as numeric constants.
Simple String Variables
String variables are used to hold strings (a collection of characters). They are named by a single letter followed by a dollar sign:
45