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Thread: Decimal to hex problem

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    Post Decimal to hex problem

    Why do i not get a value 0 when my input is 0.

    import java.util.Scanner; 
     
    public class Dec2Hex {
    	public static void main(String[] args){
    		int dec; 
    		String hexStr = ""; 
    		int radix = 16;  
    		char[] hexChar = {'0', '1', '2', '3', '4','5','6','7','8','9', 'A', 'B', 'C', 'D', 'E', 'F'};
     
    		//Read input
    		Scanner in = new Scanner(System.in); 
    		System.out.print("Enter an interger: ");
    		dec = in.nextInt(); 
     
    		while(dec>0) {
    			int hexDigit = dec % radix; 
    			hexStr = hexChar[hexDigit] + hexStr;  
    			dec = dec / radix; 
    			}
     
    		System.out.println("The hexadecimal equivalent is: "+hexStr);
    	}
    }
    Last edited by kennylty; March 4th, 2014 at 10:46 AM.


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    Super Moderator Norm's Avatar
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    Default Re: Decimal to hex problem

    Can you post the contents of the console from when the program is executed showing what you are asking about?

    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.

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    Default Re: Decimal to hex problem

    Thanks for the reply, this is my first post

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    Default Re: Decimal to hex problem

    Quote Originally Posted by kennylty View Post
    Why do i not get a value 0 when my input is 0.
    while(dec>0) {
    See the condition
    And it's not sufficient to change the condition (otherwise you'll go in "loop").
    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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    Default Re: Decimal to hex problem

    Quote Originally Posted by andbin View Post
    See the condition
    And it's not sufficient to change the condition (otherwise you'll go in "loop").
    but if i change it to
    while (dec>=0)
    it does not return the println at all.

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    Default Re: Decimal to hex problem

    Quote Originally Posted by kennylty View Post
    but if i change it to
    while (dec>=0)
    it does not return the println at all.
    I told "And it's not sufficient to change the condition (otherwise you'll go in "loop")."

    You don't need a while .... you need a do-while (with same condition as before).
    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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    Default Re: Decimal to hex problem

    Quote Originally Posted by andbin View Post
    I told "And it's not sufficient to change the condition (otherwise you'll go in "loop")."

    You don't need a while .... you need a do-while (with same condition as before).

    Wow! i got it already. thanks so much. Need to read up the different uses of loops again

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