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Thread: Calculate the average

  1. #1
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    Default Calculate the average

    I wrote a code to calculate the average of numbers. The problem is that you only can insert whole numbers. Does anybody know how I can change the code so that I can insert float numbers?

    Here's the code i did with the help of a tutorial:

    Dies ist der Code:

    public class main_class {
    public static void main(String[] args){
    String sentinel = "";
    int sum = 0;
    int counter = 0;
    double mean = 0.0;
    Scanner NumScanner = new Scanner(System.in);

    System.out.println("Enter numbers to add. Enter \"d\" when done.");

    System.out.print("Enter number: ");
    sentinel = NumScanner.next();
    System.out.println();

    while(!sentinel.equals("d") && !sentinel.equals("D")) {
    sum += Integer.parseInt(sentinel);
    counter++;

    System.out.print("Enter number: ");
    sentinel = NumScanner.next();
    System.out.println();
    }

    mean = (sum*1.0)/counter;

    System.out.println();
    System.out.println("The arithmetic mean is: " + mean +".");
    }
    }


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Calculate the average

    The Scanner class has methods for reading different types of numbers.
    Also the Double class has a method for converting a String to a double.
    Take a look at the API doc: Java Platform SE 7

    Please edit your post and wrap your code with code tags:
    [code=java]
    YOUR CODE HERE
    [/code]
    to get highlighting and preserve formatting.
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Default Re: Calculate the average

    Original code below. Dont know the answer as im not too good at coding.

    public class main_class {
    public static void main(String[] args){
    String sentinel = "";
    int sum = 0;
    int counter = 0;
    double mean = 0.0;
    Scanner NumScanner = new Scanner(System.in);
     
    System.out.println("Enter numbers to add. Enter \"d\" when done.");
     
    System.out.print("Enter number: ");
    sentinel = NumScanner.next();
    System.out.println();
     
    while(!sentinel.equals("d") && !sentinel.equals("D")) {
    sum += Integer.parseInt(sentinel);
    counter++;
     
    System.out.print("Enter number: ");
    sentinel = NumScanner.next();
    System.out.println();
    }
     
    mean = (sum*1.0)/counter;
     
    System.out.println();
    System.out.println("The arithmetic mean is: " + mean +".");
    }
    }

  4. #4
    Super Moderator Norm's Avatar
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    Default Re: Calculate the average

    I suggested two different ways to get float numbers:
    1) use a Scanner class method to read the data as float from the user
    2) use a Double or Float class method to convert the String read from the user to a double/float


    BTW The posted code has lost all its formatting. The statements should not all start in the first column. Nested statements should be indented.
    If you don't understand my answer, don't ignore it, ask a question.

  5. #5
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    Default Re: Calculate the average

    Change the integers & doubles to floats and let the scanner read it as a float [scan.nextFloat();].
    Note: make sure you import the scanner class (java.util.Scanner.

  6. #6
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    Default Re: Calculate the average

    Thank You!

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