C padding code - Pad a hex value with leading zeros.

hex.c

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

int main()
{
        int hex = 11100;
        //Get length of hex.
        int dlen = floor(log10(abs(hex))) + 1;
        //Find how many leading zeros we need.
        int dpad = 6 - dlen;
        //Our final hex code.
        char fhex[] = "000000";
        char shex[7];
        //Convert hex to a string.
        sprintf(shex, "%d", hex);
        //Copy shex to fhex, using dpad as a memory offset.
        memcpy(fhex+dpad, shex, dlen);
        printf("%s" , fhex);
        return 1;
}