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Thread: Simple java program help please.

  1. #1
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    Question Simple java program help please.

    package firstproject;
    import java.util.Scanner;
    import java.text.NumberFormat;

    public class MileageApp {
    public static void main(String[] args){

    //create scanner object
    Scanner sc = new Scanner(System.in);

    String repeat = "yes";
    while(repeat.equalsIgnoreCase("yes")){

    //Display Welcome massage
    System.out.println("Welcome to MPG Calculator ");
    System.out.println("");

    System.out.print("What is your Name: ");
    String name = sc.nextLine();

    System.out.print("What is your Car Model: ");
    String model = sc.nextLine();

    System.out.print("What is your Car Make: ");
    String make = sc.nextLine();

    System.out.print("What is your starting Odometer reader: ");
    double startingMileage = sc.nextDouble();

    System.out.print("What is your ending odometer reader: ");
    double endingMileage = sc.nextDouble();

    System.out.print("What is your Starting Gallons of Gas in the Tank:");
    double startingGallons = sc.nextDouble();

    System.out.print("What is your Ending Gallons of Gas in the Tank:");
    double endingGallons = sc.nextDouble();


    //Calculate mileage traveled
    double mileageTraveled = endingMileage - startingMileage;

    //calculate gallons of gas
    double gasUsed = startingGallons - endingGallons;

    //calculate Mileage per gallon
    double mpg = mileageTraveled / gasUsed;

    //price of a gas of gallon
    final double GAS_PRICE = 3.85;

    //calculate travel Cost
    double gasCostPerGallon = GAS_PRICE * gasUsed;

    String rate = "";

    //if else statement
    if (mpg <= 20){
    rate = "Gas Guzzler";
    }
    else if (mpg <= 30 && mpg >= 20){
    rate = "Good";
    }
    else if (mpg > 30){
    rate = "Amazing";
    }

    //Create currency formatting object
    NumberFormat cf = NumberFormat.getCurrencyInstance();

    NumberFormat df = NumberFormat.getNumberInstance();

    //display summary
    System.out.println("Welcome to the MPG Calculator!");
    System.out.println("");
    System.out.println("Customer Name: " + name );
    System.out.println("Car Model: " + model );
    System.out.println("Car Make: " + make);
    System.out.println("Starting Odometer Reading: " + startingMileage);
    System.out.println("Ending Odometer Reading: " + endingMileage);
    System.out.println("Miles Traveled: " + mileageTraveled);
    System.out.println("Gallons of Gas Used: " + gasUsed);
    System.out.println("Cost of Gas per Gallon: " + cf.format(gasCostPerGallon));
    System.out.println("Mile Per Gallon Usage (MPG): " + df.format(mpg));
    System.out.println("Car MPG rating is: " + rate);
    System.out.println("");

    //ask if they want to continue
    System.out.print("Do you want to continue? (Yes/No)");
    System.out.println("");

    repeat = sc.next();


    }

    System.out.println("Thank you for using Mileage App!");
    sc.close();
    }

    }



    Ok my problem is when say yes to continue, it prints out:
    Welcome to MPG Calculator

    What is your Name: What is your Car Model:


    instead of just what is your name

    please tell me what is wrong with my code thank you


  2. #2
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    Default Re: Simple java program help please.

    After using the last sc.next() there is still some data left in the buffer. You need to clear the buffer after calling next()

  3. The Following User Says Thank You to Parranoia For This Useful Post:

    Arg (April 28th, 2014)

  4. #3
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    Default Re: Simple java program help please.

    Thank you but can you tell me how?

  5. #4
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    Default Re: Simple java program help please.

    Welcome to the forum! Please read this topic to learn how to post code in code or highlight tags and other useful info for new members.

    Please post your code correctly. You can edit your post and fix it.

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