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Thread: working with decimal point numbers

  1. #1
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    Smile working with decimal point numbers

    Good Morning,
    please suggest me a better code .

    // my java program goes like this

    public class FloatingNumber {

    public static void main(String...args) {

    double i;
    double num=0.0;
    for(i=0.0;i<10;i++)
    num=num+0.1;

    System.out.println(num);

    }

    }

    // output: 0.9999999999999999


    // The same program in C goes like this

    #include<stdio.h>
    #include<math.h>

    main()

    {
    double i, num=0.0;

    for(i=0;i<10;i++)
    num=num+0.1;
    printf("%f",num);

    }

    // output=1.0000


    /** please do explain me why java is not producing an accurate value as C program did.
    For an accurate result , please do sugges me good code for java
    Thanks in advance.


  2. #2
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    Default Re: working with decimal point numbers

    You can use math.round to round to 1.0

  3. #3
    Member andbin's Avatar
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    Default Re: working with decimal point numbers

    Quote Originally Posted by raam View Post
    /** please do explain me why java is not producing an accurate value as C program did.
    Floating-point numbers have these problems because they are stored on a finite number of bits. This happens in Java, in C, in C#, in Javascript, etc...
    Floating-point numbers cannot accurately represent all numbers. For example 0.3 cannot be accurately represented. It will be very very close to 0.3 but never exactly 0.3. Where you can "see" a difference is when there is an implicit or explicit rounding, especially when you use some "print" method.
    You should understand this before criticizing your or other code.
    Andrea, www.andbin.net SCJP 5 (91%) SCWCD 5 (94%)

    Useful links for Java beginners My new project Java Examples on Google Code

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    Senior Member PhHein's Avatar
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    Default Re: working with decimal point numbers

    Read this article for further information: What Every Computer Scientist Should Know About Floating-Point Arithmetic

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