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Thread: Why won't my program compile? (While loop with inputs)

  1. #1
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    Question Why won't my program compile? (While loop with inputs)

    import java.util.Scanner;

    public class Factorial {

    public static void main(String[] args) {

    Scanner input = new Scanner(System.in);
    System.out.println("Enter Number ===>> ");

    int factorial;
    while(input>0)
    {
    factorial *= input;
    input--;
    }

    System.out.println(factorial);
    }
    }



    The errors I get are:

    --------------------Configuration: Factorial - JDK version 1.7.0_25 <Default> - <Default>--------------------
    C:\Users\Luke\Documents\AP comp. Sci\Factorial.java:11: error: bad operand types for binary operator '>'
    while(input>0)
    ^
    first type: Scanner
    second type: int
    C:\Users\Luke\Documents\AP comp. Sci\Factorial.java:13: error: bad operand types for binary operator '*'
    factorial *= input;
    ^
    first type: int
    second type: Scanner
    C:\Users\Luke\Documents\AP comp. Sci\Factorial.java:14: error: bad operand type Scanner for unary operator '--'
    input--;


  2. #2
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    Default Re: Why won't my program compile? (While loop with inputs)

    Scanner is an object, not a number. How can it be greater than 0?
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    Default Re: Why won't my program compile? (While loop with inputs)

    Please read the Announcement topic at the top of each/any sub-Forum to learn how to post your code in code tags.

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    Default Re: Why won't my program compile? (While loop with inputs)

    Use the Scanner nextInt() method to get your int variable.

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    Default Re: Why won't my program compile? (While loop with inputs)

    you have not initialized the factorial and input.
    take the reference of scanner with different name then assign that reference to input with nextLine() method.
    then it will be compiled.

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    Default Re: Why won't my program compile? (While loop with inputs)

    Rubbish!

    Why do they need to do all that instead of following the good advice by GoodbyeWorld?
    Improving the world one idiot at a time!

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