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Thread: Help with switch statements

  1. #1
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    Default Help with switch statements

    Hello all,

    I'm in a intro java class, and while the teacher is great, I am still having some issues with understanding how to use the switch method.

    The instructions are to:
    write a program that calculates the price per month that an ISP charges according to base plan + usage. There are three plans: A,B,C.

    Each are targeted to different people, but if you use too many hours, a certain plan will work best for you and the program is supposed to point that out.

    So basically,

    Plan A: $9.95/month for first 10 hours, $2.00 extra for each additional hours
    Plan B: $13.85 first 20 hours, each addt. hour $1
    Plan C: $19.95 and unlimited hours

    I will need to ask the user for the plan type they are using, and then how many hours.

    Then, calculate their bill.

    Then if there is a plan that works better for them, I will need to use a switch statement to recommend them a better plan (if one exists) and then display the amount of money they will save by switching.


    I wrote what I have so far, but I am having problems with switch statements since it doesn't let me use operators such as == != || && and it also doesn't allow me to use double variables.

    I would appreciate any help. Thanks for reading.

    p.s.

    My code is really inefficient, since I need to write each case separately by the hour entered. I would like to use interval groups like "hours > 20" or similar. My program also isn't able to calculate what the best plan would be and to display the cost savings. I know my code is probably an eyesore, it's my first week with programming in general so please understand. Thank you







    import java.util.Scanner;
     
    public class InternetPackages
     
    {
        public static void main(String [] args)
        {
        String input; //hold a line of input
        char Package; //hold single character
     
        int hours; //holds hour online
        double baseA = 9.95;
        double baseB = 13.95;
        double baseC = 19.95;
     
     
     
        //Scanner to read input from user
     
        Scanner keyboard = new Scanner(System.in);
     
     
        System.out.println("Please enter your current Package Plan: \n"
            +"A \n"
            +"B \n"
            +"C \n");
     
     
        {
            input = keyboard.nextLine(); //get a line of input
            Package = input.charAt(0); //get the first character
            //ring choice = input.next();
     
     
        System.out.println("How many whole hours did you use the internet for this month?\n"
                                     + "(Round up to the nearest whole hour.)\n"
                                    + "If hours exceed 30, please enter 30.");
     
            hours = keyboard.nextInt();
     
     
            if (input.equals ("A")&&(hours > 10.0))
     
                    {
                    double resultA = ((hours - 10.0) * 2)+(baseA); //first 10 hours free
                    System.out.println("Amount due: " +resultA);
                    }
     
     
            if (input.equals ("A") && (hours <= 10.0))
                    System.out.println("Amount due: " +baseA);
     
        else
     
            if (input.equals ("B") && (hours > 20.0))
                    {
                    double resultB = ((hours - 20.0) * 1)+ (baseB);
                    System.out.println("Amount due: " +resultB);
                    }
     
            if (input.equals ("B") && (hours <= 20.0))
                    {
                    System.out.println("Amount due: " +baseB);
                    }
        else
     
            if (input.equals ("C"))
                System.out.println("Amount due :" +baseC);
     
     
     
     
    switch (hours)
    {
     
    case (1):
        System.out.println("You would not save any money by switching to another plan.");
        break;
     
    case (2):
        System.out.println("You would not save any money by switching to another plan.");
        break;
     
    case (3):
        System.out.println("You would not save any money by switching to another plan.");
        break;
     
    case (4):
        System.out.println("You would not save any money by switching to another plan.");
        break;
     
    case (5):
        System.out.println("You would not save any money by switching to another plan.");
        break;
     
    case (6):
        System.out.println("You would not save any money by switching to another plan.");
        break;
     
    case (7):
        System.out.println("You would not save any money by switching to another plan.");
        break;
     
    case (8):
        System.out.println("You would not save any money by switching to another plan.");
        break;
     
    case (9):
        System.out.println("You would not save any money by switching to another plan.");
        break;
     
    case (10):
        System.out.println("You would not save any money by switching to another plan.");
        break;
     
    case (11):
        System.out.println("You would not save any money by switching to another plan.");
        break;
     
    case (12):
        System.out.println("You would not save any money by switching to another plan.");
        break;
     
    case (13):
        System.out.println("The package that would save you the most money is B");
        break;
     
    case (14):
        System.out.println("The package that would save you the most money is B");
        break;
     
    case (15):
        System.out.println("The package that would save you the most money is B");
        break;
     
    case (16):
        System.out.println("The package that would save you the most money is B");
        break;
     
    case (17):
        System.out.println("The package that would save you the most money is B");
        break;
     
    case (18):
        System.out.println("The package that would save you the most money is B");
        break;
     
    case (19):
        System.out.println("The package that would save you the most money is B");
        break;
     
    case (20):
        System.out.println("The package that would save you the most money is B");
        break;
     
    case (21):
        System.out.println("The package that would save you the most money is B");
        break;
     
    case (22):
        System.out.println("The package that would save you the most money is B");
        break;
     
    case (23):
        System.out.println("The package that would save you the most money is B");
        break;
     
    case (24):
        System.out.println("The package that would save you the most money is B");
        break;
     
    case (25):
        System.out.println("The package that would save you the most money is B");
        break;
     
    case (26):
        System.out.println("The package that would save you the most money is B");
        break;
     
    case (27):
        System.out.println("The package that would save you the most money is C");
        break;
     
    case (28):
        System.out.println("The package that would save you the most money is C");
        break;
     
    case (29):
        System.out.println("The package that would save you the most money is C");
        break;
     
    case (30):
        System.out.println("The package that would save you the most money is C");
        break;
     
        default:
            System.out.println("Please enter hours in whole values.");
     
          }
        }
      }
    }


  2. #2
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    Default Re: Help with switch statements

    Aw snap.
    Use if statements instead...
    if(hours => 1 && hours < 13) print no better plan
    else if(hours => 13 && hours < 27) print B
    etc
    Switch doesn't make any sense here.

  3. #3
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    Default Re: Help with switch statements

    Quote Originally Posted by codesmuggler View Post
    Aw snap.
    Use if statements instead...
    if(hours => 1 && hours < 13) print no better plan
    else if(hours => 13 && hours < 27) print B
    etc
    Switch doesn't make any sense here.
    Thanks for the help. That's exactly what I was thinking. However, our instructor told us to modify the statements to use switch statements.

    Here is the directions:

    Step 1: Write a program that calculates a customer’s monthly bill. It should ask the user to enter the letter
    of the package the customer has purchased (A, B, C) and the number of hours that were used. It should then
    display the total charges.
    Step 2: modify the program to use switch statement
    Step 3: modify the program such that for package A/B customers, the money that they could save if they
    switch to B or C plans. If no money will be saved, display no message.

  4. #4
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    Default Re: Help with switch statements

    So what's the problem, if you have already written it?

  5. #5
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    Default Re: Help with switch statements

    I already submitted the assignment. Thanks

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