程序代码：

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

int  comp( const  void  * p,  const  void  * q)
{
    return ( * ( unsigned long long * ) p - * ( unsigned long long * ) q) ;
}

int main()
{
    unsigned long long i,j=0;
    unsigned long long *p = (unsigned long long *)malloc(1000000*sizeof(unsigned long long));
    printf("dd\n");
    for (i = 999999;i>0 ;i-- )
        p[j++]=i;
    p[j++]=i;

    printf("dd1\n");

    qsort ( p,  1000000,  sizeof ( unsigned long long ) ,  comp) ;
    free(p);
}