convert from dec to hex and save in hex

[tcat72]

my overall goal is to sort hexidecimal numbers. My problem is converting from long int to hex and saving my data in hex format so that I may sort it in that format. For example:
long num = 1030507233;
How do I convert and save this? I know that the hex value is 3d6c4ea1 because I can print it out in hex format. How can I get and save this? I will also need to convert it back to decimal format once it has been sorted. This part shouldn't raise too much of a problem, but I'll appreciateany and all suggestions.

 

[tcat72]

I have found the answer. I used the function itoa(). Here is an example:

#include <stdio.h>
#include <stdlib.h>

int main() {
char str[10]; /* MUST be big enough to hold all the characters of your number!! */

printf(&quot;15 in binary is %s\n&quot;, itoa(15, str, 2));
printf(&quot;15 in octal is %s\n&quot;, itoa(15, str, 8));
printf(&quot;15 in decimal is %s\n&quot;, itoa(15, str, 10));
printf(&quot;15 in hex is %s\n&quot;, itoa(15, str, 16));
return 0;
}