编写算法啊，他利用折半查找实现确定记录所在块的分块查找。c语言编程

好的，下面是基于折半查找实现的分块查找算法的C语言代码：

#include <stdio.h>
#include <stdlib.h>

#define BLOCK_SIZE 4 //每块记录数
#define RECORD_NUM 16 //总记录数

//定义记录类型
typedef struct {
    int key;
    //其他数据域
}RecordType;

//定义块类型
typedef struct {
    RecordType records[BLOCK_SIZE];
    int low, high;
}BlockType;

//初始化分块表
void InitBlockList(BlockType blockList[], int blockNum) {
    int i, j;
    for (i = 0; i < blockNum; i++) {
        blockList[i].low = i * BLOCK_SIZE;
        blockList[i].high = blockList[i].low + BLOCK_SIZE - 1;
        for (j = 0; j < BLOCK_SIZE; j++) {
            blockList[i].records[j].key = blockList[i].low + j;
        }
    }
}

//折半查找
int BinarySearch(RecordType records[], int low, int high, int target) {
    int mid;
    while (low <= high) {
        mid = (low + high) / 2;
        if (records[mid].key == target) {
            return mid;
        }
        else if (records[mid].key < target) {
            low = mid + 1;
        }
        else {
            high = mid - 1;
        }
    }
    return -1;
}

//分块查找
int BlockSearch(BlockType blockList[], int blockNum, int target) {
    int i, j;
    for (i = 0; i < blockNum; i++) {
        if (target >= blockList[i].low && target <= blockList[i].high) {
            j = BinarySearch(blockList[i].records, 0, BLOCK_SIZE - 1, target);
            if (j >= 0) {
                return i * BLOCK_SIZE + j;
            }
        }
    }
    return -1;
}

int main() {
    BlockType blockList[RECORD_NUM / BLOCK_SIZE];
    InitBlockList(blockList, RECORD_NUM / BLOCK_SIZE);
    int target = 10;
    int pos = BlockSearch(blockList, RECORD_NUM / BLOCK_SIZE, target);
    if (pos >= 0) {
        printf("目标记录在第%d个位置\n", pos);
    }
    else {
        printf("未找到目标记录\n");
    }
    return 0;
}

注：上述代码实现的是在已知分块表的情况下进行分块查找，即假定每块记录的关键字按升序排列。如果需要实现动态建立分块表的功能，需要在插入和删除记录时维护分块表，保证每块记录的关键字仍按升序排列。