'ceiling and floor easily implemented as functions.
'e & pi not available- calculate as shown.

FUNCTION ceiling (x)
    IF x < 0 THEN ceiling = INT(x) ELSE ceiling = INT(x) + 1
END FUNCTION

FUNCTION floor (x)
    IF x > 0 THEN
        floor = INT(x)
    ELSE
        IF x <> INT(x) THEN floor = INT(x) - 1 ELSE floor = INT(x)
    END IF
END FUNCTION

PRINT "e     = "; EXP(1)            ' e  not available
PRINT "PI    = "; 4 * ATN(1)        ' pi not available

x = 12.345: y = 1.23

PRINT "sqrt  = "; SQR(x), x ^ .5    ' square root- NB the unusual name
PRINT "ln    = "; LOG(x)            ' natural logarithm base e
PRINT "log10 = "; LOG(x) / 2.303    ' base 10 logarithm
PRINT "log   = "; LOG(x) / LOG(y)   ' arbitrary base logarithm
PRINT "exp   = "; EXP(x)            ' exponential
PRINT "abs   = "; ABS(-x)           ' absolute value
PRINT "floor = "; floor(x)          ' floor
PRINT "ceil  = "; ceiling(x)        ' ceiling
PRINT "power = "; x ^ y             ' power
END