Want to win a PS4? Go Premium and enter to win our High-Tech Treats giveaway. Enter to Win

x
?
Solved

easiest way to get Decimal to Hex in c++?

Posted on 2004-10-04
6
Medium Priority
?
403 Views
Last Modified: 2010-04-17
if anyone could write a quick code segment or explain the easiest way to convert decimal integers to hex in c++ that'd be great. thanks.
0
Comment
Question by:drumrboy44
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
6 Comments
 
LVL 1

Expert Comment

by:Perfunction
ID: 12219902
0
 
LVL 11

Expert Comment

by:raj3060
ID: 12219995
Try this link:
http://www.gidforums.com/t-2615.html
They have very good comments and explanation.
0
 
LVL 55

Accepted Solution

by:
Jaime Olivares earned 2000 total points
ID: 12220178
you can use c++ sstream library. Something like:

#include <iostream>
#include <sstream>
#include <string>

using namespace std;

// somewhere in your code
    int testnumber = 100;
    stringstream ss;   // this object will do the conversion

    ss << hex << testnumber;   // 'hex' will format number to hex format
    cout << ss.str();  // display result  str() method return the hex string, you can assign it to a 'string' object
0
Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 
LVL 59

Expert Comment

by:Julian Hansen
ID: 12220215
I am assuming you want to do this for display purposes - for any other purpose there is not really a conversion because 0xFF = 255 = 11111111.

Output to the console

printf ( "%x", decimalnumber) ;

save to a string

sprintf ( str, "%x", decimalnumber ) ;
0
 
LVL 2

Expert Comment

by:Ruskialt
ID: 12224390
If your decimal number (and integer) is in a string first convert the number to an int, then format the variable to another string

char pInteger[] = "256"; //my integer string
char pHex[256]; //destination string
int nValue;

if( sscanf( pInteger , "%d" , &nValue ) == 1 ) //returns number of converted elements
{
   sprintf( pHex , "0x%08x" , nValue );
}

=> pHex now holds "0x00000100"

CString has a Format() function that doest excactly what sprintf() does, in case you use MFC. Also if your source string is in a CString, you can use it as the first parameter in the sscanf() statement, because CString's can be seen as const char*'s

leave the "0x", and the "08" if you dont want the prefix and the 0-padding and the 8 characters wide field
0
 
LVL 59

Expert Comment

by:Julian Hansen
ID: 12224567
Just a minor point - if you are going to convert from a string you could also use atoi or atol

char dec[] = "1234" ;
char hex[10] ;
int x ;

x = atoi ( str ) ;
sprintf ( hex, "0x%08x", x ) ; // adopting Ruskialt's formatting options here


0

Featured Post

Keep up with what's happening at Experts Exchange!

Sign up to receive Decoded, a new monthly digest with product updates, feature release info, continuing education opportunities, and more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Make the most of your online learning experience.
What do responsible coders do? They don't take detrimental shortcuts. They do take reasonable security precautions, create important automation, implement sufficient logging, fix things they break, and care about users.
Six Sigma Control Plans
Progress

609 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question