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Thread: display the generated Math.random number

  1. #1
    Junior Member PsYNus's Avatar
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    Default display the generated Math.random number

    I've been playing around with some coding and asci values. My program below will return an asci value generated by the Math.random method. Is there another method that i may use to display that value that the Math.random generates?
    Please let me know if i didnt open this thread properly

    public class CharList
    {
    public static void main(String[] args)
    {
    char myFirstChar;
    myFirstChar = (char) (Math.random()); //A
    //System.out.println(myFirstChar);

    for (int i = 1; i<0; i++);
    {
    myFirstChar = 1;
    //System.out.println(myFirstChar);
    }

    System.out.println(myFirstChar);

    }
    }


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    Default Re: display the generated Math.random number

    I'm not sure what you mean by "another method that i may use to display that value". Do you mean in a GUI? Something else?
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    Junior Member PsYNus's Avatar
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    Default Re: display the generated Math.random number

    Oh sorry i was wondering if there is some code that i can add to the program that will return that randomly generated number from the Math.random

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    Default Re: display the generated Math.random number

    I'm still really not positive what you mean, but you could either create a method that calls it for you, or you could look into the Random class.

    But now that I'm looking at your code a little closer, it doesn't make a ton of sense. Math.random() returns a number between 0 (inclusive) and 1 (exclusive), so converting it to a char will always give you zero, won't it? And what is that for loop supposed to be doing?
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    Junior Member PsYNus's Avatar
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    Default Re: display the generated Math.random number

    Still kind of new with java so i thought i'd throw that loop in there to see what it would do. should i not do that? so that math.random line will only return a value between 0 and 0.999 recuring?

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    Default Re: display the generated Math.random number

    Quote Originally Posted by PsYNus View Post
    Still kind of new with java so i thought i'd throw that loop in there to see what it would do. should i not do that?
    That depends on what you want it to do. Recommended reading: The for Statement (The Java™ Tutorials > Learning the Java Language > Language Basics)

    Quote Originally Posted by PsYNus View Post
    so that math.random line will only return a value between 0 and 0.999 recuring?
    You tell me. What does the API say? It is your new best friend: Java Platform SE 6
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    Junior Member PsYNus's Avatar
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    Default Re: display the generated Math.random number

    is there a way i could download the API? i dont have an internet connection at home :<

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    Crazy Cat Lady KevinWorkman's Avatar
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    Default Re: display the generated Math.random number

    Quote Originally Posted by PsYNus View Post
    is there a way i could download the API? i dont have an internet connection at home :<
    Yeah. It's available towards the bottom of this page: Java SE Downloads
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  9. #9
    Junior Member PsYNus's Avatar
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    Default Re: display the generated Math.random number

    oh i think i see now how the math.random can work. it will generate a random number between 0 (including) and 0.999 recuring (including) and you have to times that by 100 to get a whole number. is that correct?

  10. #10
    Crazy Cat Lady KevinWorkman's Avatar
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    Default Re: display the generated Math.random number

    Quote Originally Posted by PsYNus View Post
    oh i think i see now how the math.random can work. it will generate a random number between 0 (including) and 0.999 recuring (including) and you have to times that by 100 to get a whole number. is that correct?
    Almost. You multiply it by whatever you want your maximum (non-inclusive) to be. If you want a char, check out the upper bounds for them.

    Also, don't be afraid to try these things before you ask. It's going to be faster and more reliable for you, plus it's good to get in the habit of writing little test programs. What happened when you tried it?
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  11. #11
    Junior Member PsYNus's Avatar
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    Default Re: display the generated Math.random number

    i've altered the code (it now gives the numerical value for the asci symbol) for example: 90.7456468755941 is the numerical value for: . So i'm gonna find a method that will round the number down

  12. #12
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    Default Re: display the generated Math.random number

    Converting it to a char should round it down for you...
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