Math with Dice

GM: As you climb out of the fireplace, roll a stealth check to avoid making noise in the charcoal and debris below.

Gridon: 1d20+4

GNOLL: [5]

GM: Oh no! A big hairy gnoll in the next room has noticed all the noise you’re making!

Gridon: Crap! I make a run for it. Where’s the door?

GM: There’s another door, but… it’s locked!

Numeric Dice

For Numeric Dice, math follows normal conventions.

• Add (+):
  • 1+2 = 3
• Subtract (-):
  • 4-3 = 1
• Multiply (*):
  • 5*2: 10
• Divide (rounding up(\) and rounding down(/)):
  • 10/2: 5 -Modulo (%):
  • 10%3 = 1
• Brackets (())

Be careful with characters like \ and / and be sure to escape them if needed in your calling program.

Other dice notation parsers either choose to round up, down or allow floating points.

With the two styles of division, we intend to remove the necessity for early introduction to Functions

Symbolic Dice

For Symbolic Dice, even if the symbols are numbers, the logic is different as GNOLL treats the values as strings (words).

• Add (+) Concatenate two symbols: “A”+”B” = “AB”
• Subtract (-) Remove if there is overlap between symbols:
  • “AAA”-“C”= “AAA”.
  • “ABA”-“A”= “BA”
• Multiply (*) - Duplicate if multiplying by a number. Cannot multiply by a symbol
  • “A” * 5 = “AAAAA”
  • “A” * “B” = ERR
• Divide (\ or /): Currently always produces an error.
• Modulo (%): Currently always produces an error.
• Brackets (())