定义一个包含5个教师成员的结构体数组，教师信息包括职工号、姓名和工资。要求从键盘输入所有教师的信息，并设计一个sort函数实现结构体数组按教师工资由少到多排序。目前，已编辑完成main函数，请编程实现

以下是实现代码：

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

#define MAX_NUM 5

struct Teacher {
char id[20];
char name[20];
int salary;
};

int cmp(const void *a, const void *b) {
const struct Teacher *pa = (const struct Teacher *)a;
const struct Teacher *pb = (const struct Teacher *)b;
return pa->salary - pb->salary;
}

int main() {
struct Teacher teachers[MAX_NUM];

for (int i = 0; i < MAX_NUM; i++) {
printf("请输入第%d个教师的职工号、姓名、工资（用空格分隔）：", i+1);
scanf("%s%s%d", teachers[i].id, teachers[i].name, &teachers[i].salary);
}

qsort(teachers, MAX_NUM, sizeof(struct Teacher), cmp);

printf("按工资由少到多排序的教师信息为：\n");
for (int i = 0; i < MAX_NUM; i++) {
printf("%s\t%s\t%d\n", teachers[i].id, teachers[i].name, teachers[i].salary);
}

return 0;
}