Question

After creating a simple java craps game, I decided to have it test for 1 million iterations. For whatever reason, dividing the two numbers with this code

System.out.println("Wins: "+w+" Losses: "+l);
double avg = 100*(w / l);
System.out.println("Average: "+avg);

This for whatever reason prints the correct number of wins and losses but when it divides it just gets 0.0 Any help would be much appreciated.

Resolved code:

    double w = 0 , l = 0;
    for(int c=1;c<1000000;c++)
    {
    if(playGame() == true)
    {
        System.out.println("You win!");
        w++;
    }
    else
    {
        System.out.println("You lost!");
        l++;
    }
    }
    System.out.println("Wins: "+w+" Losses: "+l);
    double avg = (100*(w / l))/2;
    System.out.println("Average: "+avg);

Answer 1

i suspect that your w and l might be ints. when you divide ints, they don’t evaluate to doubles, they evaluate to ints, and they always round down

Now you have 2 options if that indeed is the case

• take w and l as doubles during input
• cast w and l to doubles before you don any arithmetic on them.

try:

double dWin = w;
double dLoss = l

System.out.println("Wins: "+dWin+" Losses: "+dLoss);
double avg = 100*(dWin / l);
System.out.println("Average: "+avg);