Question

Sooo I started taking my second computer science class ever! For my first class we used python and for this class we’re using Java. Our first assignment (pretty much just practice) is to convert this craps program from Python to Java and I’m just having a hell of a time.

Could someone please help with what I’ve done and umm give me some advice? Maybe a good site for a beginner…. Someone that kinda knows Python (only from a first CS course perspective).

1) In python

def winCraps():
roll = rollDice()
if roll == 7 or roll == 11:
    return True
elif roll == 2 or roll == 3 or roll == 12:
    return False
else:
    return rollForPoint(roll)

This is my attempt at the conversion of it over to java

public int winCraps{
    roll = rollDice();
    if (roll = 7 && 11){
    return (true);
    }
    else (roll =2 && 3 && 12){
    return(false);
    }
    else{
    return rollforPoint(roll);
}
}

2) Python

def rollDice():
raw_input("Press <Enter> to roll...")
die1 = randrange(1,7)
die2 = randrange(1,7)
sum = die1 + die2
print "You rolled", die1, "+", die2, "=", sum
return sum

This one confused the hell out of me. What would randrange be in Java??

Java

static int rollDice(){
System.out.print("Press <Enter> to roll...");
double die1 = Math.random();
double die2 = Math.random();
die1 = (int) die1*6+1;
 die2 = (int) die2*6+1;
 int sum = (int)die1 + (int)die2;
 System.out.println("You rolled  "+die1+ " + "+die2+ " = "+sum+".");
 return sum;
 }

*please bear in mind that I’m just learning this stuff lol

Answer 1

You need to fix your if statements the “==” operator checks for equality, and you must put the variable you are checking against in each section of the statement.

public int winCraps{
    roll = rollDice();
    if (roll == 7 || roll == 11) {
        return true;
    }
    else if(roll == 2 || roll == 3 || roll == 12) {
        return false;
    }
    else{
        return rollforPoint(roll);
    }
}

In you rollDice() method, the way you assign values to each die is incorrect. I recommend reading up on random numbers (since this is homework, I’ll leave that to you).

Also, remember in java you must always end each statement with a semicolon