lsearch / lfind

#include <stdio.h>
#include <search.h>
#define TABLESIZE 5

int compare(const void *ap, const void *bp)
{
    return ( *(int *)ap - *(int *)bp);
}

void main()
{
    int table[TABLESIZE]={1,2,3,4,5};
    unsigned int n = TABLESIZE;
    int item, *ptr;
    item = 6;
    ptr = (int*)lsearch(&item, table, &n, sizeof(int), compare);
    if (ptr >= table +n-1)
        printf("%d is not in the table(1-%d), but added.\n",item,n);
    else
        printf("%d in in the table(1-%d).\n",*ptr,n);
    
    item =7;
    ptr = (int*)lfind(&item, table, &n, sizeof(int), compare);
    if (ptr == NULL)
        printf("%d is not in the table(1-%d).\n",item,n);
    else
        printf("%d in in the table(1-%d).\n",*ptr,n);
}