// CSC 581 - Spring 2018 - Dave Reed
// Exercises from 2/1/18
//////////////////////////////////////////////////////////////

func rollDie(sides: Int = 6) -> Int {
    return Int(arc4random_uniform(UInt32(sides)))+1
}

func rollDice(sides: Int = 6, thisMany numDice: Int = 2) -> Int {
    var sum = 0;
    for _ in 1...numDice {
        sum += rollDie(sides: sides)
    }
    return sum
}

func rollPercentage(of total: Int, outOf numRolls: Int = 10_000) -> Double {
    if numRolls == 0 {
        return 0.0
    }
    
    var matches = 0
    for _ in 1...numRolls {
        if rollDice() == total {
            matches += 1
        }
    }
    return 100.0*Double(matches)/Double(numRolls)
}