* 函数名称：sort * 函数功能：对教师数组元素按工资由小到大进行排序 * 形式参数：t, struct teacher型指针，教师数组首地址 * 形式参数：n, int型，教师数组元素个数

下面是一个对教师数组按照工资由小到大排序的示例代码：

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

typedef struct {
    char name[20];
    int age;
    float salary;
} teacher;

void sort(teacher *t, int n) {
    int i, j;
    teacher temp;
    for (i = 0; i < n - 1; i++) {
        for (j = i + 1; j < n; j++) {
            if (t[i].salary > t[j].salary) {
                temp = t[i];
                t[i] = t[j];
                t[j] = temp;
            }
        }
    }
}

int main() {
    teacher t[5] = {
        {"Tom", 30, 2500},
        {"Jerry", 25, 3000},
        {"Alice", 35, 2000},
        {"Bob", 28, 3500},
        {"Lucy", 33, 1800}
    };
    int i;
    printf("Before sorting:\n");
    for (i = 0; i < 5; i++) {
        printf("%s\t%d\t%.2f\n", t[i].name, t[i].age, t[i].salary);
    }
    sort(t, 5);
    printf("After sorting:\n");
    for (i = 0; i < 5; i++) {
        printf("%s\t%d\t%.2f\n", t[i].name, t[i].age, t[i].salary);
    }
    return 0;
}

输出结果为：

Before sorting:
Tom     30      2500.00
Jerry   25      3000.00
Alice   35      2000.00
Bob     28      3500.00
Lucy    33      1800.00
After sorting:
Lucy    33      1800.00
Alice   35      2000.00
Tom     30      2500.00
Jerry   25      3000.00
Bob     28      3500.00