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<TITLE>Exercice 2</TITLE>
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<B> Suivant:</B> <A NAME="tex2html2314"
 HREF="node77.htm" tppabs="http://www.linux-kheops.com/doc/ansi-c/node77.htm">Structures, unions et 閚um閞ations</A>
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<B> Pr閏閐ent:</B> <A NAME="tex2html2306"
 HREF="node75.htm" tppabs="http://www.linux-kheops.com/doc/ansi-c/node75.htm">Exercice 1</A><HR>
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<H1><font COLOR=#1809BB><A NAME="SECTION00780000000000000000">
Exercice 2</A>
</font></H1>
Reprendre la calculette r閍lis閑 en fin de chapitre sur les pointeurs et y
rajouter une gestion correcte des erreurs. Si l'utilisateur tape une ligne
incorrecte, on d閟ire l'閙ission d'un message d'erreur, et une continuation
de la boucle de calcul.
<P><SMALL>
<PRE>
#include &quot;stdio.h&quot;

/*****************************************************************************/
/*                                                                           */
/*                              main                                         */
/*                                                                           */
/*****************************************************************************/
int main()
{
FILE * fi;
char nom[80];
char article[80];
int nombre,prix;

if ((fi = fopen(&quot;exer6.data&quot;,&quot;r&quot;)) == NULL)
   printf(&quot;Impossible d'ouvrir le fichier exer6.data\n&quot;);
else
   {
   while(fscanf(fi,&quot;%s %s %d %d&quot;,nom,article,&amp;nombre,&amp;prix) != EOF)
      printf(&quot;%s %s %d\n&quot;,nom,article,nombre * prix);
   fclose(fi);
   }
}
</PRE>
</SMALL>
<P><SMALL>
<PRE>
#include &lt;stdio.h&gt;

enum {FAUX, VRAI};

/*****************************************************************************/
/*                                                                           */
/*                              main                                         */
/*                                                                           */
/*****************************************************************************/
int main()
{
int i,j,r;  /*   les op閞andes  */
char c;     /*   l'op閞ateur   */
char imp;   /*   bool閑n de demande d'impression du r閟ultat  */
int ret;    /*   code de retour de scanf   */
char buf_err[80];

while (1)
   {
   if ((ret = scanf(&quot;%d %c %d&quot;,&amp;i,&amp;c,&amp;j)) != 3)
      {
      if (ret == EOF) exit(0);
      scanf(&quot;%[^\n]&quot;,buf_err);   /*   on mange la partie erron閑   */
      printf(&quot;Erreur de syntaxe : %s\n&quot;,buf_err);
      continue;
      }
   imp = VRAI;
   switch (c)
      {
      case '+' : r = i + j; break;
      case '-' : r = i - j; break;
      case '*' : r = i * j; break;
      case '/' :
         if ( j == 0)
            {
            printf(&quot;Division par z閞o\n&quot;);
            imp = FAUX;
            }
         else r = i / j;
         break;
      case '%' : r = i % j; break;
      default  : printf(&quot;l'op閞ateur %c est incorrect\n&quot;,c); imp = FAUX;
      }   /*   fin du switch   */

   if (imp) printf(&quot;%d\n&quot;,r);
   }
}
</PRE>
</SMALL>
<P>
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<ADDRESS>
<I></I>
<BR><I>30/9/1997</I>
</ADDRESS>
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