编辑代码

class Main {
	public static void main(String[] args) {
        //JSRUN引擎2.0，支持多达30种语言在线运行，全仿真在线交互输入输出。
        int[] arr = {10,21,23,54,76,87,99,987,999};
        int target = 23;
        int mid = Search(arr,target);
		System.out.println("函数为第"+mid+"位");
	}
    public static int Search(int[] arr,int target){
        int lo =0;
        int hi = arr.length-1;
        while(lo<=hi){
        int mid = lo+(hi-lo)/2;
        if(target == arr[mid]){
            return mid;
        }else if(target>arr[mid]){
            lo = mid+1;
        }else{
            hi = mid-1;
        }
    }
    return -1;
    }
}