Bronze Edition Guide - True BASIC

33
CHAPTER
Constants, Variables and Expressions 6
True BASIC lets you work with two kinds of information — numbers and strings. By definition,
strings are any combination of characters. Examples of string data include names,
addresses, or phone numbers. Let’s look first at numbers in True BASIC programs.
When you use numbers in a True BASIC program, they may be constants, variables, or
expressions (expression is just another name for formula). Look again at the simple MPG
program that you created earlier:
! Compute miles per gallon
!
LET miles = 420
LET gallons = 14.3
PRINT miles, gallons, miles/gallons
END
! miles traveled
! gas used
Constants
The MPG program contains two numbers: 420 and 14.3. These are called constants or
numeric constants.
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x Constants are quantities whose values can’t change during a program run.
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You can write constants as whole numbers, such as 420, or as decimals such as 14.3
Note, however, that you can’t include any spaces or commas in numbers in True BASIC.
Thus 10,000 must be written as 10000.