How to convert a string to integer in C?

Question

I am trying to find out if there is an alternative way of converting string to integer in C.

I regularly pattern the following in my code.

char s[] =         


        

Answer 1

You can code atoi() for fun:

int my_getnbr(char *str)
{
  int result;
  int puiss;

  result = 0;
  puiss = 1;
  while (('-' == (*str)) || ((*str) == '+'))
  {
      if (*str == '-')
        puiss = puiss * -1;
      str++;
  }
  while ((*str >= '0') && (*str <= '9'))
  {
      result = (result * 10) + ((*str) - '0');
      str++;
  }
  return (result * puiss);
}

You can also make it recursive, which can fold in 3 lines. =)