rock = 0
paper = 1
scissors = 2

A_WINS = 0
B_WINS = 1
DRAW = 2

outcomes[][] = { { DRAW, B_WINS, A_WINS },
                        {  A_WINS, DRAW, B_WINS},
                        {  A_WINS, B_WINS, DRAW}

compare(a, b) {
    return outcomes[a, b]
}

choose() {
    return random(0, 3)
}

userInput = getInput()
computerInput = choose()

result = compare(userInput, computerInput)

output(result)