Steps 7-8 on Cumulative Project 3

Get Help Java
#1

Hello, I am stuck with the 7th and 8th steps on the Cumulative project 3 .
https://www.codecademy.com/paths/introduction-to-android-with-java/tracks/programming-logic/modules/cumulative-project-3/projects/unquote-game-logic-pt-i

The exact instruction is
" 7.

Calculate a random number between 0 and max

Use the result from task 6 to calculate a random number between 0 and max (the parameter you pass into generateRandomNumber() ) and save it to a local double variable."

Cast the result to an integer.

Ultimately, we need a whole number to decide which question to present next because presenting question number 3.2312 or question 0.7 is impossible (we can’t show 70% of a question… right? :thinking:).

Instead, we will use a programming technique called casting to convert one data type to another, in this case, from a double type to an int type.

An integer cannot retain any decimal values, so given the doubles above, 3.2312 casts down to 3 , and 0.7 casts down to 0 . In both cases, we lose the decimal value.

To cast, we place the resulting type we desire as a prefix to the original data (in parentheses). Check out this example of casting from an int to a boolean :"

I have no idea what these steps want me to do. I’d appreciate any hints . My source code so far is right here:

public class MainActivity {
// Add generateRandomNumber() here
   public static int generateRandomNumber(int max){
     double value = Math.random() * max;
     return (int) value;

     

   }
// Add getGameOverMessage() here
  
   public static void main(String[] args) {
    
   }
   

}
#2

Your code seems ok. Is it not working, or throwing an error?

#3

If I try to put numbers into “value” and run it, it throws an error.
I actually can’t comprehend the steps. Looks like these ask me to test calculations but I’m not sure how to multiply values by “max” and “math”

#4

If you call the generateRandomNumber() function inside main, using MainActivity.generateRandomNumber(someNumber), is there an error thrown? The way you’re calculating the random number seems to be correct.

#5

If I do exactly what you told me, unfortunately there’s an error thrown. So I put the below code

// Add getGameOverMessage() here
  
   public static void main(String[] args) {
    MainActivity.generateRandomNumber(someNumber);
   }
   

}

Then the error pops out as follows:

MainActivity.java:13: error: cannot find symbol
    MainActivity.generateRandomNumber(someNumber);
                                      ^
  symbol:   variable someNumber
  location: class MainActivity
1 error

If I put a random number in there like

MainActivity.generateRandomNumber(7),
there’s no error thrown but the result is empty. Does it mean that I’m doing this task correctly?

#6

Yes. Since the generateRandomNumber function uses return, nothing will be logged to the console. If you wrap the whole thing in System.out.println(), then you should see the result.

#7

Thank you so much! I can see the result now. I hope I will not get into any more issues in this project.

1 Like