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Samuel Gomes edited this page Nov 8, 2022 · 1 revision

The CONST statement globally defines one or more named numeric or string values which will not change while the program is running.

Syntax

CONST constantName = value[, ...]

Parameter(s)

  • constantName is the constant name or list of names assigned by the programmer.
  • value is the value to initialize the global constant which cannot change once defined.
    • If constantName specifies a numeric type, value must be a numeric expression containing literals and other constants.
    • If constantName specifies a string type, the value must be a literal value.

Description

Example(s)

Display the circumference and area of circles:

' Declare a numeric constant approximately equal to the ratio of a circle's
' circumference to its diameter:
CONST PI = 3.141593

' Declare some string constants:
CONST circumferenceText = "The circumference of the circle is"
CONST areaText = "The area of the circle is"

DO
    INPUT "Enter the radius of a circle or zero to quit"; radius
    IF radius = 0 THEN END
    PRINT circumferenceText; 2 * PI * radius 
    PRINT areaText; PI * radius * radius ' radius squared
    PRINT
LOOP

Enter the radius of a circle or zero to quit? *10*
The circumference of the circle is 62.83186
The area of the circle is 314.1593

Enter the radius of a circle or zero to quit? *123.456*
The circumference of the circle is 775.697
The area of the circle is 47882.23

Enter the radius of a circle or zero to quit? *0*

Explanation: PI cannot change as it is a mathematical constant so it is fitting to define it as a constant. Trying to change PI will result in a calculation error.

Example 2: Using _RGB32 to set a constant's value.

CONST Red = _RGB32(255,0,0)

COLOR Red
PRINT "Hello World"

See Also

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