DaniWeb Forum Index > Software Development > C

hexadecimal to decimal

Please support our C advertiser: Programming Forums - DaniWeb Sister Site

Thread Solved

•

Join Date: Apr 2009

Posts: 14

Reputation: newbiecoder is an unknown quantity at this point

Solved Threads: 0

newbiecoder newbiecoder is offline

Offline

Newbie Poster

hexadecimal to decimal

Apr 26th, 2009

Hi I want to write a program which reads a hexadecimal number and returns an decimal number.

I wrote that code(inspired by some code pieces from web):

 Help with Code Tags 
 C Syntax (Toggle Plain Text) 
#include <stdio.h>
 int main()
 
 {
       int hexa;
 
      scanf("%x", &hexa);
      printf("%d", hexa);
 
        return 0;
 
 }
#include <stdio.h>
 int main()

 {
       int hexa;

      scanf("%x", &hexa);
      printf("%d", hexa);

        return 0;

 }

but it does't give the answer I want

I want to get 16 for 10000000 or 1109651713 for 01F12342 .

Could you please help me with that?

Thanks
--
newbiecoder

•

Join Date: Feb 2009

Posts: 1,968

Reputation: tux4life has a reputation beyond repute

Solved Threads: 214

tux4life

Offline

Posting Virtuoso

Re: hexadecimal to decimal

Apr 26th, 2009

> Use the itoa function / sprintf function if you want to convert decimal to hexadecimal (I'm not sure about the fact that the sprintf function will convert a string containing a decimal number to a hexadecimal number, you can simply test it if you want to know it

) ...

> If you don't care about the fact the code is in C/C++ you can also check out this code snippet

Last edited by tux4life; Apr 26th, 2009 at 7:39 am.

"Never argue with idiots, they just drag you down to their level and then beat you with experience."

•

Join Date: Apr 2009

Posts: 14

Reputation: newbiecoder is an unknown quantity at this point

Solved Threads: 0

newbiecoder newbiecoder is offline

Offline

Newbie Poster

Re: hexadecimal to decimal

Apr 26th, 2009

Although itoa function seems very useful, I couldn't use it, I use Ubuntu and gcc compiler. And when I try to compile I get this error:

•

undefined reference to `itoa'

What is the problem you think?
Thanks

•

Join Date: Feb 2009

Posts: 1,968

Reputation: tux4life has a reputation beyond repute

Solved Threads: 214

tux4life

Offline

Posting Virtuoso

Re: hexadecimal to decimal

Apr 26th, 2009

•

Originally Posted by newbiecoder

Although itoa function seems very useful, I couldn't use it, I use Ubuntu and gcc compiler. And when I try to compile I get this error:

What is the problem you think?
Thanks

Did you add the following include directive at the top of your code?
#include <stdlib.h>

"Never argue with idiots, they just drag you down to their level and then beat you with experience."

•

Join Date: Apr 2009

Posts: 14

Reputation: newbiecoder is an unknown quantity at this point

Solved Threads: 0

newbiecoder newbiecoder is offline

Offline

Newbie Poster

Re: hexadecimal to decimal

Apr 26th, 2009

Yes I surely added, I actually directly tried the example code in the cplusplus page you sent...

•

Join Date: Apr 2009

Posts: 14

Reputation: newbiecoder is an unknown quantity at this point

Solved Threads: 0

newbiecoder newbiecoder is offline

Offline

Newbie Poster

Re: hexadecimal to decimal

Apr 26th, 2009

And I tried the code in another compiler. It worked but as I see it gets numbers in decimal but I need to get numbers in hexadecimal...
Thanks...

•

Join Date: May 2006

Posts: 3,124

Reputation: WaltP has much to be proud of

Solved Threads: 283

WaltP

Offline

Posting Sensei

Re: hexadecimal to decimal

Apr 26th, 2009

1: Zero your Total
2: Read the input as a string (hex)
3: Check each character and conve rt it into decimal value (A=10, B=11, etc)
4: Multiply Total by 16 and add the above value
5: Back to 2

The 3 Laws of the Procrastination Society:
1) Never do today that which can be put off until tomorrow
2) Tomorrow never comes