52 lines
1.5 KiB
C
52 lines
1.5 KiB
C
#include "c_BinarySearch.h"
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
|
|
typedef struct {
|
|
int id;
|
|
char name[20];
|
|
double score;
|
|
} Student;
|
|
|
|
// 用户自定义的比较函数：按学号 (id) 升序比较
|
|
int compareStudentsById(const void* a, const void* b) {
|
|
const Student* s1 = (const Student*)a;
|
|
const Student* s2 = (const Student*)b;
|
|
|
|
if (s1->id < s2->id) return -1;
|
|
if (s1->id > s2->id) return 1;
|
|
return 0;
|
|
}
|
|
|
|
int main() {
|
|
// 准备一个已经按 id 排好序的结构体数组
|
|
Student students[] = {
|
|
{101, "Alice", 92.5},
|
|
{105, "Bob", 88.0},
|
|
{109, "Charlie", 95.0},
|
|
{112, "David", 79.5}
|
|
};
|
|
size_t count = sizeof(students) / sizeof(students[0]);
|
|
|
|
// 创建一个查找模板（只需要填入你想查找的依据字段）
|
|
Student targetKey;
|
|
targetKey.id = 109;
|
|
|
|
// 调用通用二分查找
|
|
Student* result = (Student*)c_BinarySearch(
|
|
&targetKey, // 目标元素的指针
|
|
students, // 数组首地址
|
|
count, // 元素数量
|
|
sizeof(Student), // 每个结构体占用的字节大小
|
|
compareStudentsById // 比较函数的指针
|
|
);
|
|
|
|
// 检查并输出结果
|
|
if (result != NULL) {
|
|
printf("成功找到！姓名: %s, 成绩: %.1f\n", result->name, result->score);
|
|
} else {
|
|
printf("未找到学号为 %d 的学生。\n", targetKey.id);
|
|
}
|
|
|
|
return 0;
|
|
} |