#include    <stdio.h>
#include    <search.h>

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

void main()
{
static int    ary[10]={2,4,1,3,5,7,9,6,8,0};
static int    target=5;
int    *ptr;

    qsort(ary,10,sizeof(int),cmp_func);

    ptr=(int *)bsearch(&target,ary,10,sizeof(int),cmp_func);
    if(ptr!=NULL){
        printf("target is ary[%d]\n",ptr-ary);
    }
    else{
        printf("target not found\n");
    }
}