把这段代码从c++转换为c语言#include <iostream> #include <algorithm> #include <cmath> using namespace std; struct Person { string name; int height; }; bool cmp(Person p1, Person p2) { if (p1.height != p2.height) { return p1.height < p2.height; } else { return p1.name > p2.name; } } int main() { Person people[15]; int count = 0; while (true) { cin >> people[count].name; if (people[count].name == "#") { break; } cin >> people[count].height; count++; } sort(people, people + count, cmp); int mid = count / 2; if (count % 2 == 1) { cout << "mid height=" << people[mid].height << ",name=" << people[mid].name << endl; } else { cout << "mid height=" << (people[mid - 1].height + people[mid].height) / 2.0 << endl; cout << "first person:" << people[mid - 1].name << "," << people[mid - 1].height << endl; cout << "second person:" << people[mid].name << "," << people[mid].height << endl; } for (int i = 0; i < count; i++) { cout << people[i].name << " " << people[i].height << endl; } return 0; }

以下是将该C++代码转换为C语言代码的过程：

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

struct Person {
    char name[20];
    int height;
};

int cmp(const void* p1, const void* p2) {
    struct Person* person1 = (struct Person*) p1;
    struct Person* person2 = (struct Person*) p2;
    if (person1->height != person2->height) {
        return person1->height - person2->height;
    } else {
        return strcmp(person2->name, person1->name);
    }
}

int main() {
    struct Person people[15];
    int count = 0;
    while (1) {
        scanf("%s", people[count].name);
        if (strcmp(people[count].name, "#") == 0) {
            break;
        }
        scanf("%d", &people[count].height);
        count++;
    }
    qsort(people, count, sizeof(struct Person), cmp);
    int mid = count / 2;
    if (count % 2 == 1) {
        printf("mid height=%d,name=%s\n", people[mid].height, people[mid].name);
    } else {
        printf("mid height=%.1f\n", (people[mid - 1].height + people[mid].height) / 2.0);
        printf("first person:%s,%d\n", people[mid - 1].name, people[mid - 1].height);
        printf("second person:%s,%d\n", people[mid].name, people[mid].height);
    }
    for (int i = 0; i < count; i++) {
        printf("%s %d\n", people[i].name, people[i].height);
    }
    return 0;
}

主要的变化包括：

1. 头文件改为 `<stdio.h>`, `<string.h>`, `<stdlib.h>`。
2. C语言中没有 `string` 类型，需要使用字符数组（char array）。
3. C语言中的函数 `scanf` 和 `printf` 替代了C++中的 `cin` 和 `cout`。
4. C语言中的比较函数 `qsort` 参数类型不同，需要进行相应的修改。