數據結構複習（二）二分查找算法

package algorithm.search;

public class Search {

	public int BinSearch(int [] a,int k){
		int low = 0;
		int high = a.length-1;
		while(low<=high){
			int mid = (low+high+1)/2;
			if(k==a[mid]){
				return mid;
			}else if(k<a[mid]){
				high = mid-1;
			}else{
				low = mid+1;
			}
		}
		return 0;
	}
	public static void main(String[] args) {
		Search search = new Search();
		int a[] = {2,5,6,9,12,45,68,71,75,79,85,96,102,200,205,300,999};
		System.out.println(search.BinSearch(a, 9));
	}
}