Langage C

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

void usage(const char*progname)
{
  fprintf(stderr, "usage %s, length1, length2\n", progname);
}
void no_alloc()
{
  fprintf(stderr, "Memory allocation error\n");
}
 
void dump_array(int* tab, unsigned int len)
{
  int i =0;
  for( ; i < len; i++)
    {
      printf("%d ", tab[i]);
      putchar('\n');
    }
}

int compint(int *a, int *b)
{
  return ((int)*a - (int)*b);
}

int *merge_int_array( const int* tab1, unsigned int n1, const int* tab2, unsigned int n2)
{
  int *result = malloc(n1+n2);
  //void *memcpy(void *dest, const void *src, size_t n);
  memcpy(result, tab1, n1 * sizeof(int));
  memcpy(result + n1, tab2, n2 * sizeof(int));
  /*void qsort(void *base, size_t nmemb, size_t size, int (*compar)(const void *, const void *)); */
  qsort(result, n1 + n2, sizeof(int), compint);
  return result;
  
}

int main(int argc, char*argv[])
{
  int i,n1, n2;
  int *tab1, *tab2, *merged_array;
  if (argc < 3)
    {
      usage(argv[0]);
      return EXIT_SUCCESS;
    }
  
  n1 = atoi(argv[1]);
  n2 = atoi(argv[2]);
  tab1 = malloc(n1 * sizeof(int));
  tab2 = malloc(n2 * sizeof(int));
  srand(time(NULL));
  if((tab1 == NULL) | (tab2 == NULL))
    {
      no_alloc();
      return EXIT_FAILURE;
    }
  for (i = 0; i< n1; i++)
    {
      tab1[i] = rand();
    }
  for (i = 0; i< n2; i++)
    {
      tab2[i] = rand();
    }
  printf("At line %d\n", __LINE__);
  printf("Dummping array1:\n");
  dump_array(tab1, n1);
  printf("Dummping array2:\n");
  dump_array(tab2,n2);
  merged_array = merge_int_array(tab1, n1, tab2, n2);
  printf("Dummping merged array:\n");
  dump_array(merged_array, n1 + n2);
  return EXIT_SUCCESS;
}
johand@osiris: ~/src/CCM/C $ ./merge_arrays 5 5
At line 70
Dummping array1:
614374766 
2043203106 
90578780 
1356121019 
1081406063 
Dummping array2:
1617966626 
734061849 
1707533276 
555258101 
1624582305 
Dummping merged array:
90578780 
555258101 
614374766 
734061849 
1081406063 
1356121019 
1617966626 
1624582305 
1707533276 
2043203106