qsort - 배열을 정렬한다.

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#include <stdlib.h>
void qsort(void *base, size_t nmemb, size_t size,
           int(*compar)(const void *, const void *));
 
 
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#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define MAX 1000000
int fn_qsort_intcmp( const void *a, const void *b )
{
  return( *(int *)a - *(int *)b);
}
int main()
{
  int *a;
  int i;
  int *c;
  a = (int *)malloc(sizeof(int)*MAX);
  clock_t stime, etime;
  for (i = 0; i < MAX; i++)
  {
    a[i] = random()%MAX;
  }
  stime = clock();
  qsort( a, MAX, sizeof(int), fn_qsort_intcmp );
  etime = clock();
  printf("Time : %.3fs\n",(double)(etime - stime)/CLOCKS_PER_SEC);
  return 0;
 
 
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