public class erfen {
public static void main(String[] args) {
int[] arr = {
1,5,25,66,88,99,444};
int i = erFen(arr, 99);
if (i == -1){
System.out.println("数组中没有该数");
}else{
System.out.println("该数在数组中的索引是"+i);
}
}
public static int erFen(int[] arr , int findVal){
int left = 0;
int right = arr.length-1;
while (left <= right){
int mid = (left + right) / 2;
if (arr[mid] == findVal){
return mid;
}else if (arr[mid] > findVal){
right = mid -1;
}else {
left = mid +1;
}
}
return -1;
}
}
该数在数组中的索引是5