🚀 go-pugleaf

(supersedes <mn.ad417d590cf08264.15512@YOURBRAnoos.fr>)

Pierre Maurette wrote on 21/09/05 :
> #include <stdio.h>
> #include <stdlib.h>
> #include <errno.h>
> #include <inttypes.h>
>
> void usage(void)
> {
>   puts("Syntaxe: icarre valeur (repr�sentant un entier)\nMais Auchan vend 
> des trucs qui le font\npour moins d'un euro, et sans ordinateur.");
>   exit(EXIT_SUCCESS);
> }
>
> int main(int argc, char * argv[])
> {
>   uintmax_t entier;
>   char * pvaleur = NULL;
>   const uintmax_t borne = sqrtl((long double)UINTMAX_MAX);
>
>   if(argc != 2) usage();
>   pvaleur = argv[1];
>   while(pvaleur[0] == '-' || isspace(pvaleur[0])) pvaleur++;
>   entier = strtoumax(pvaleur, NULL, 0);
>   if(errno || (entier > borne))
>             puts("Oh my God, c'est h�naurme !");
>   else
>       printf("%" PRIuMAX "\n", entier * entier);
>   return EXIT_SUCCESS;
> }

Un peu brut de d�coffrage...

main.c:13: warning: no previous prototype for 'usage'

main.c: In function `usage':

main.c:16: warning: function might be possible candidate for attribute 
`noreturn'
main.c: In function `main_':
main.c:23: error: implicit declaration of function `sqrtl'
main.c:23: warning: nested extern declaration of `sqrtl'
<internal>:0: warning: redundant redeclaration of 'sqrtl'
main.c:27: error: implicit declaration of function `isspace'

main.c:27: warning: nested extern declaration of `isspace'

Petite mise au point...

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <inttypes.h>
#include <math.h>
#include <limits.h>
#include <ctype.h>

#if 1
#if !defined (__STDC_VERSION__)\
 || (defined (__STDC_VERSION__) && __STDC_VERSION__ < 199901)
#error must be a C99 compiler
#endif
#endif

static void usage (void)
{
   puts ("Syntaxe: icarre valeur (representant un entier)\n"
         "Mais Auchan vend des trucs qui le font\n"
         "pour moins d'un euro, et sans ordinateur.");
}

int main (int argc, char *argv[])
{
   int ret = EXIT_SUCCESS;

   if (argc == 2)
   {
      const uintmax_t borne = sqrtl ((long double) UINTMAX_MAX);
      char const *pvaleur = argv[1];

      while (pvaleur[0] == '-' || isspace (pvaleur[0]))
      {
         pvaleur++;
      }

      uintmax_t entier = strtoumax (pvaleur, NULL, 0);

      if (errno || (entier > borne))
      {
         puts ("Oh my God, c'est henaurme !");
      }
      else
      {
         printf ("%" PRIuMAX "\n", entier * entier);
      }
   }
   else
   {
      usage ();
      ret = EXIT_FAILURE;
   }
   return ret;
}


-- 
Emmanuel
The C-FAQ: http://www.eskimo.com/~scs/C-faq/faq.html
The C-library: http://www.dinkumware.com/refxc.html

 I once asked an expert COBOL programmer, how to
declare local variables in COBOL, the reply was:
 "what is a local variable?"