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#include <stdio.h>
#include <string.h>
#include <math.h>
 
int main()
{
   const int maxdigits = 20;    /* max number of base 6 digits */
   int num=123456789, rem = 0;
   int tempnum = abs(num);
   int lastpos = maxdigits;
 
   /* initialize array, and initialize array to spaces */
   char res[maxdigits + 1];
   memset(res, ' ', maxdigits);
 
   /* null terminate */
   res[maxdigits] = 0;
 
   while(tempnum != 0)
   {
       rem = tempnum % 6;
       res[lastpos--] = rem + '0'; /* set this element to the character digit */
       tempnum /= 6;
   }
   printf("%s%s", (num<0?)"-":"", res + lastpos + 1); /* print starting from the last digit added */
}

prog.c:9:18: warning: implicitly declaring library function 'abs' with type 'int (int)' [-Wimplicit-function-declaration]
   int tempnum = abs(num);
                 ^
prog.c:9:18: note: include the header <stdlib.h> or explicitly provide a declaration for 'abs'
prog.c:25:26: error: expected expression
   printf("%s%s", (num<0?)"-":"", res + lastpos + 1); /* print starting from the last digit added */
                         ^
prog.c:25:26: error: expected ':'
   printf("%s%s", (num<0?)"-":"", res + lastpos + 1); /* print starting from the last digit added */
                         ^
                         : 
prog.c:25:25: note: to match this '?'
   printf("%s%s", (num<0?)"-":"", res + lastpos + 1); /* print starting from the last digit added */
                        ^
prog.c:25:26: error: expected expression
   printf("%s%s", (num<0?)"-":"", res + lastpos + 1); /* print starting from the last digit added */
                         ^
1 warning and 3 errors generated.

Standard output is empty