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Binary String Display

Posted on 2001-06-21
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Last Modified: 2010-03-31
I would like to create a Binary String Formatter?

Example:

If i feed it a 2...I would like it to display

00000010

OR

0010

OR

10

Depending on what I want the bit display length to be. I want the final string to be saved in a variable that I can pass to other classes for various displays??



Any suggestions?
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Question by:Vernstump
4 Comments
 

Expert Comment

by:johnbrewer1980
ID: 6216207
how about the following function:
void printBinary(int number, int displayLength) {
   for (int i = displayLength - 1; i >= 0; --i) {
      System.out.print((number >> i) & 1);
   }    
}
0
 
LVL 2

Expert Comment

by:iDeb
ID: 6216208
take your class and override the toString method and put a for loop where you divide your number by 2 and depending upon whether there is a remainder you add a 1 or 0 to a string.
0
 
LVL 2

Expert Comment

by:venkat2000120699
ID: 6216222
Here is a traditional approach to the problem.

public class BinaryFormatter {
    public static void main(String args[]) {
        int a[] = new int[32];
        int n = 31;
        int maximumNumberOfBitsToDisplay = 4;
       
        int number = 10;
       
System.out.println("The bit pattern for " + number + " is:");
       
        while(number > 0) {
            int bit = number % 2;
            a[n--] = bit;
            number = (int)(number / 2);
        }
       
       
        for (int k=a.length - maximumNumberOfBitsToDisplay; k < a.length; k++) {
                 System.out.print(a[k]);
        }
     
    }//end of main()
}//end of class
0
 
LVL 1

Accepted Solution

by:
eattrig earned 50 total points
ID: 6216298
There is a static method in java.lang.Integer called toBinaryString(int).  It returns a String representation of the number (in decimal) which you pass in.  However, there is no parameter where the client can specify how much 0 padding to place on the end.  But you could write the following:

public static String getBinary(int num)
{
    String numStr = Integer.toBinaryString(num);
    // if you wanted a total of 8 digits in the String
    int addZeros = 8 - numStr.length();
    for (int x = 0; x < addZeros; x++)
        numStr = '0' + numStr;
    return numStr;
}
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