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Declares one or more symbolic constants.

CONST constantname = expression [,constantname = expression]...

    ■ constantname    The name of the constant. This name can consist of up
                      to 40 characters and must begin with a letter. Valid
                      characters are A-Z, 0-9, and period (.).
    ■ expression      An expression that is assigned to the constant. The
                      expression can consist of literals (such as 1.0), other
                      constants, any arithmetic or logical operators except
                      exponentiation (^), or a single literal string.

Example:
    CONST PI = 3.141593
    INPUT "Radius of Circle: "; r
    PRINT "Area = "; PI * r ^ 2
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