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Listing 3. I18n Version of the Program Shown in Listing 2

/* Non-executable part */
#include <stdio.h>
#include <ctype.h>
#include <libintl.h>
#include <locale.h>
#define _(str) gettext (str)
#define gettext_noop(str) (str)
#define N_(str) gettext_noop(str)
int main() {
  int i, length, counter=0;
  char *mess, line[11], *info[]={
    N_ ("digit"), N_ ("digits")};

  /* Executable part */
  setlocale(LC_ALL,"");
  bindtextdomain ("counter", ".");
  textdomain ("counter");

  printf(_("Please, type a line\n"));
  fgets(line,11,stdin);
  length=strlen(line);
  for(i=0; i<length; i++)
    counter+=isdigit(line[i])?1:0;
  mess=counter>1?info[1]:info[0];
  printf (_("You typed %d %s\n"),
          counter,_(mess));
  exit(0); }
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