Use Flexible Array Members (C99) - C Array

C examples for Array:Array Value

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Description

Use Flexible Array Members (C99)

Demo Code

#include <stdio.h>
#include <stdlib.h>

struct flex/* w w  w .  j a v a  2  s.  c  o m*/
{
   size_t count;
   double average;
   double scores[];   // flexible array member
};

void showFlex(const struct flex * p);

int main(void)
{
   struct flex * pf1, *pf2;
   int n = 5;
   int i;
   int tot = 0;

   pf1 = (flex *)malloc(sizeof(struct flex) + n * sizeof(double));

   pf1->count = n;

   for (i = 0; i < n; i++) {
      pf1->scores[i] = 20.0 - i;
      tot += pf1->scores[i];
   }
   pf1->average = tot / n;

   showFlex(pf1);

   n = 9;
   tot = 0;
   pf2 = (flex *)malloc(sizeof(struct flex) + n * sizeof(double));
   pf2->count = n;

   for (i = 0; i < n; i++) {
      pf2->scores[i] = 20.0 - i / 2.0;
      tot += pf2->scores[i];
   }
   pf2->average = tot / n;
   showFlex(pf2);
   free(pf1);
   free(pf2);

   return 0;
}

void showFlex(const struct flex * p) {
   int i;
   printf("Scores : ");
   for (i = 0; i < p->count; i++)
      printf("%g ", p->scores[i]);
   printf("\nAverage: %g\n", p->average);
}

Result


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