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ISSUE: when I run the code, it is not deducting any demerit points!!!


General description of offence Demerit points:
Demerit points Exceeding the speed limit fixed by not more than 10 km/h (10) Exceeding the speed limit by more than 10km/h but not more than 20 km/h (20) Exceeding the speed limit by more than 20km/h but not more than 30 km/h (35) Exceeding the speed limit by more than 30km/h but not more than 35 km/h (40)
Exceeding the speed limit by more than 35km/h (50)

1-Complete the pulledOverSpeeding method in the Driver class according to the information in this table- it takes 2 doubles (representing the speed and the speedlimit) and updates the number of demerit points that this driver currently has. You mayassumethat only positive numbers will be passed into the pulledOverSpeeding method. You may assume that speeds less than or equal to the speed limit will not receive demerit points. (This is not necessarily true in real life!)

2-Complete the main method in the TrafficCop class according to the comments provided.

this Code is for Jgrasp (java)

What I have tried:

Driver Class

/** Represents a driver in New Zealand*/
public class Driver{

   private String name;
   private double demeritPoints;
   private final int MAX_DEMERIT = 100;
   private boolean banned;
   
   /** Takes a String to initialise the name data field
      @param n this driver's name
   */
   public Driver(String n){
      name = n;
   }

   /** Takes two doubles representing the speed limit and the speed this driver was going.
    It adjusts their demerit points total accordingly and then determines if they are banned
    @Fred speedLimit the speed limit in place as they are pulled over
    @Fred clockedSpeed the speed at which they have been clocked
   */
   public void pulledOverSpeeding(double speedLimit, double clockedSpeed){  
      // code goes here
      if (clockedSpeed >= 10) {
         System.out.println(demeritPoints + 10);
      } else if (( clockedSpeed >= 10) && clockedSpeed <= 10){
         System.out.println(demeritPoints + 20);
      } else if (( clockedSpeed >= 20) && clockedSpeed <= 30){
         System.out.println(demeritPoints + 30);
      } else if (( clockedSpeed >= 30) && clockedSpeed <= 35){
         System.out.println(demeritPoints + 40);
      } else if (clockedSpeed >= 35){
         System.out.println(demeritPoints + 50);
      }
   }
   
   public boolean getBanned (){
      if(demeritPoints > MAX_DEMERIT){
         return true;
      }else{
         return false;
      }
   }
 
   
   /**Displays the driver's details.*/
   public void displayDriverDetails(){
      System.out.println("Name: " + name);
      System.out.println("Current demerit points: " + demeritPoints);
      System.out.print(name + " is currently ");
      if(banned){
         System.out.print("not ");
      }
      System.out.println("allowed to drive.");
   }
}



Application class

/** A class responsible for penalising Drivers for speeding*/
public class TrafficCop{
public static void main (String[] args){
Driver d1 = new Driver("Fred");

// display the details of d1
      d1.displayDriverDetails();
     
  // Fred is pulled over doing 82 kph in a 50kph zone – call the appropriate method
      d1.pulledOverSpeeding(50,82);
     
      // Fred is pulled over doing 108 kph in a 100kph zone – call the appropriate method
      d1.pulledOverSpeeding(100,108);
      // Fred is pulled over doing 102kph in a 80kph zone – call the appropriate method
      d1.pulledOverSpeeding(80,102);
// display d1's details again
      d1.displayDriverDetails();
}
}
Posted
Updated 10-Dec-22 21:34pm

Compiling does not mean your code is right! :laugh:
Think of the development process as writing an email: compiling successfully means that you wrote the email in the right language - English, rather than German for example - not that the email contained the message you wanted to send.

So now you enter the second stage of development (in reality it's the fourth or fifth, but you'll come to the earlier stages later): Testing and Debugging.

Start by looking at what it does do, and how that differs from what you wanted. This is important, because it give you information as to why it's doing it. For example, if a program is intended to let the user enter a number and it doubles it and prints the answer, then if the input / output was like this:
Input   Expected output    Actual output
  1            2                 1
  2            4                 4
  3            6                 9
  4            8                16
Then it's fairly obvious that the problem is with the bit which doubles it - it's not adding itself to itself, or multiplying it by 2, it's multiplying it by itself and returning the square of the input.
So with that, you can look at the code and it's obvious that it's somewhere here:
Java
int Double(int value)
   {
   return value * value;
   }

Once you have an idea what might be going wrong, start using the debugger to find out why. Put a breakpoint on the first line of the method, and run your app. When it reaches the breakpoint, the debugger will stop, and hand control over to you. You can now run your code line-by-line (called "single stepping") and look at (or even change) variable contents as necessary (heck, you can even change the code and try again if you need to).
Think about what each line in the code should do before you execute it, and compare that to what it actually did when you use the "Step over" button to execute each line in turn. Did it do what you expect? If so, move on to the next line.
If not, why not? How does it differ?
Hopefully, that should help you locate which part of that code has a problem, and what the problem is.
This is a skill, and it's one which is well worth developing as it helps you in the real world as well as in development. And like all skills, it only improves by use!
 
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Your clockedSpeed comparisons are partly incorrect, but will never work because of the first test:
Java
if (clockedSpeed >= 10) { // this covers all speeds from 10 to infinity
   System.out.println(demeritPoints + 10);
} else if (( clockedSpeed >= 10) && clockedSpeed <= 10){ // it cannot be greater and less at the same time
   System.out.println(demeritPoints + 20);
} else if (( clockedSpeed >= 20) && clockedSpeed <= 30){
   System.out.println(demeritPoints + 30);
} else if (( clockedSpeed >= 30) && clockedSpeed <= 35){
   System.out.println(demeritPoints + 40);
} else if (clockedSpeed >= 35){
   System.out.println(demeritPoints + 50);
}

What you need is:
Java
if (clockedSpeed <= 10) {                    // less than or equal to 10
   System.out.println(demeritPoints + 10);
} else if (clockedSpeed <= 20){              // 11 to 20
   System.out.println(demeritPoints + 20);
} else if (clockedSpeed <= 30){              // 21 to 30
   System.out.println(demeritPoints + 30);
} else if (clockedSpeed <= 35){              // 31 to 35
   System.out.println(demeritPoints + 40);
} else if (clockedSpeed > 35){               // greater than 35
   System.out.println(demeritPoints + 50);
}
 
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