Get number into a string C without stdio

Question

I want to know how to get number to string without standard C or C++ functions, for example:

char str[20];
int num = 1234;
// How to convert that number to strin         


        

Answer 1

An "after accepted answer" that works for all int including INT_MIN.

static char *intTostring_helper(int i, char *s) {
  if (i < -9) {
    s = intTostring_helper(i/10, s);
  }
  *s++ = (-(i%10)) + '0' ;
  return s;
}

char *intTostring(int i, char *dest) {
  char *s = dest;
  if (i < 0) {  // If non 2s compliment, change to some IsSignBitSet() function.
    *s++ = '-';
  }
  else {
    i = -i;
  }
  s = intTostring_helper(i, s);
  *s = '\0';
  return dest;
}