一、题目

二、代码

#define  _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
int search(int* nums, int numsSize, int target) {
	int left = 0;
	int right = numsSize - 1;
	while (left <= right) {
		int middle = (left + right) / 2;
		if (target > nums[middle]) {
			left = middle + 1;
		}
		else if (target < nums[middle]) {
			right = middle - 1;
		}
		else if(target==nums[middle])
		{
			return middle;
		}
	}
	return -1;
}

int main()
{
	int nums[] = { -1,0,3,5,9,12 };
	int numsSize = sizeof(nums) / sizeof(nums[0]);
	int target;
	scanf("%d", &target);
	int temp = search(nums, numsSize, target);
	printf("%d", temp);
}

三、运行截图