decimal to hexadecimal

dayau89 0 282 Views

/**
* @(#)dayau_0.java
*
* dayau_0 application
*
* @author
* @version 1.00 2009/9/28
*/

public class dayau_0 {

public static void main(String[] args) {

int num = 30;
String AnsHex = "";
AnsHex = DectoHexDec(num);
System.out.println(AnsHex);
}

public static int DectoHexDec(int x) {

String result = "";
int remainder = 0;
while (x>0){
remainder = x%16;
switch(remainder){
case 1 : result = Integer.toString(remainder)+result;
break;
case 2 : result = Integer.toString(remainder)+result;
break;
case 3 : result = Integer.toString(remainder)+result;
break;
case 4 : result = Integer.toString(remainder)+result;
break;
case 5 : result = Integer.toString(remainder)+result;
break;
case 6 : result = Integer.toString(remainder)+result;
break;
case 7 : result = Integer.toString(remainder)+result;
break;
case 8 : result = Integer.toString(remainder)+result;
break;
case 9 : result = Integer.toString(remainder)+result;
break;
case 10 : result = "A"+result;
break;
case 11 : result = "B"+result;
break;
case 12 : result = "C"+result;
break;
case 13 : result = "D"+result;
break;
case 14 : result = "E"+result;
break;
case 15 : result = "F"+result;
break;
}
x = x/16;
}
return result;
}
}

/**
 * @(#)dayau_0.java
 *
 * dayau_0 application
 *
 * @author 
 * @version 1.00 2009/9/28
 */
 
public class dayau_0 {
    
    public static void main(String[] args) {
    	
    int num = 30;
    String AnsHex = "";
    AnsHex = DectoHexDec(num);
    System.out.println(AnsHex);
    }
    
    public static int DectoHexDec(int x) {
    
    String result = "";
    int remainder = 0;
    while (x>0){
    	remainder = x%16;
    	switch(remainder){
    		case 1 : result = Integer.toString(remainder)+result;
 			break;   
    		case 2 : result = Integer.toString(remainder)+result;
 			break;
    		case 3 : result = Integer.toString(remainder)+result;
 			break; 			
    		case 4 : result = Integer.toString(remainder)+result;
 			break;
    		case 5 : result = Integer.toString(remainder)+result;
 			break; 			
 			case 6 : result = Integer.toString(remainder)+result;
 			break;	
    		case 7 : result = Integer.toString(remainder)+result;
 			break; 				
    		case 8 : result = Integer.toString(remainder)+result;
 			break; 				
    		case 9 : result = Integer.toString(remainder)+result;
 			break;
    		case 10 : result = "A"+result;
 			break;
    		case 11 : result = "B"+result;
 			break;
    		case 12 : result = "C"+result;
 			break; 			
    		case 13 : result = "D"+result;
 			break; 			 			 			 				
    		case 14 : result = "E"+result;
 			break; 			
    		case 15 : result = "F"+result;
 			break; 			
 				}
 		x = x/16;
 		}
 	return result;
    }
}
Member Avatar for masijade
masijade 1,351 Industrious Poster

Do you have a question?

Member Avatar for JamesCherrill
JamesCherrill 4,733 Most Valuable Poster

Why the lengthy switch rather than something like

result = "023456789ABCDEF".charAt(remainder) + result;

Edited by JamesCherrill because: n/a
javaAddict commented: Ha, that was funny. Not to mention that he posted his code twice +9
Member Avatar for daredevilnitte
daredevilnitte 0 Newbie Poster

won't work for number with remainder zero...so insert case 0....

Member Avatar for JamesCherrill
JamesCherrill 4,733 Most Valuable Poster

If you rplace the ludicrous switch with the single line
result = "023456789ABCDEF".charAt(remainder) + result;
then you won't have that problem anyway.

Member Avatar for doomsday1216
doomsday1216 0 Newbie Poster

Theres one problem with this program, the DectoHexDec method header is "public static int DectoHexDec(int x)", but then proceeds to return a string, so that needs to be fixed.

Member Avatar for peter_budo
peter_budo 2,532 Code tags enforcer

@doomsday1216 and what would be suitable fix according to you? I'm interested to hear about it.

Member Avatar for doomsday1216
doomsday1216 0 Newbie Poster

@doomsday1216 and what would be suitable fix according to you? I'm interested to hear about it.

just change int to String (e.g. instead of public static int DectoHexDec(int x), just make it public static String DecToHexDec(int x) )

Member Avatar for doomsday1216
doomsday1216 0 Newbie Poster

Why the lengthy switch rather than something like

result = "023456789ABCDEF".charAt(remainder) + result;

In theory, .charAt returns a char, and result is a string. this can be fixed by changing result to an array of chars, and then put a small for loop to put each character into a string. This may seem convoluted, but it's still faster than the massive case/switch block. The for loop would look something like this.

String done="";
		for(int j=0;j<result.length;j++)
		{
			done=result[j]+done;
		}
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