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Returns the amount (in bytes) of available or unused memory.

FRE(numeric-expression)
FRE(stringexpression$)

    ■ numeric-expression    A value that specifies the type of memory:

                            Value               FRE returns
                            ════════════════    ═════════════════════════════
                            -1                  The size of the largest array
                                                (nonstring) you can create
                            -2                  The unused stack space
                            Any other number    The available string space

    ■ stringexpression$     Any string expression. FRE compacts the free
                            string space into a single block, then returns
                            the amount of available string space.

Example:
    PRINT "String Space", FRE("")
    PRINT "Unused Stack Space", FRE(-2)
    PRINT "Array Space", FRE(-1)
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