-h

help

-v

verbose (displays the result for each roll)

--version

prints the version of the program

Die rolls are expressed in the form NdX or NDX where N is the number of dices (1 if omitted) and X the number of dice faces.

If the final number is omitted, it is assumed to be a six.

To this basic notation, an additive modifier can be appended, yielding expressions of the form, NdX+C. The plus can be replaced by a minus sign ("-") for subtraction. C is a number to be subtracted from the final total.

See: http://en.wikipedia.org/wiki/Dice_notation

Often, the variable X in the above notation will be "%". Although a 100-sided die does exist, it is both more common and more uniformly random to use a combination of two ten-sided dice known as percentile dice, where one die represents tens and the other units. A roll of two zeroes means 100.

If you want to roll a single 100-sided die use the "d100" notation.

In some games, the above notation is expanded to allow for a multiplier, as in NdXxC or CxNdX, where "x" or "*" denotes multiplication (can be replaced by "/" for division) and C is a natural number.

Results are rounded up.

It is possible to keep only the M highest or lowest dices with the following notation:

NdXhM: roll N dices with X sides and keep the highest M results (M must be less or equal N)

NdXlM: roll N dices with X sides and keep the lowest M results (M must be less or equal N)

3d6 rolls 3 6-sided dices and sums the results (can be abbreviated with "3d")

1d8 + 3 rolls 1 8-sided die and adds 3 (can be abbreviated by "d8+3")

d% rolls 2 10-sided dices: one represents tens and the othe units

1d6x5 rolls 1 6-sided dice and multiplies the result by 5

1d6 / 2 rolls 1 6-sided dice and divides the result by 2 (1d3)

4d6h3 rolls 4 6-sided dices and keeps the 3 highest results (discarding the lowest)

expression := term [ "+" term | "-" term ] .

term := number | factor [ ("*"|"/") number | number ("*"|"/") factor | "(" expression ")" .

factor := number dice [ ("h"|"H"|"l"|"L") number ] | dice .

dice := "d" | "D" [ number | "%" ] .