程序代码：

#include<stdio.h>
struct
{
    int num;
    char name[10];
    char sex;
    char job;
    union
    {
        int clas;
        char position[10];
    }category;
}person[2];

int main()
{
    int i;
    for (i = 0; i < 2; i++)
    {
        printf("Please enter the data of person:\n");
        scanf_s("%d %s %c %c", &person[i].num, &person[i].name, 10, &person[i].sex, 1, &person[i].job, 1);
        if (person[i].job == 's')
            scanf_s("%d", &person[i].category.clas);
        else if (person[i].job == 't')
            scanf_s("%s", &person[i].category.position, 10);
        else
            printf("Input error!");
    }
    printf("\n");
    printf("No.    name    sex job class/position:\n");
    for (i = 0; i < 2; i++)
    {
        if (person[i].job == 's')
            printf("%d %7s %6c %3c %7d\n", person[i].num, person[i].name, person[i].sex, person[i].job, person[i].category.clas);
        else
            printf("%d %7s %6c %3c %7s\n", person[i].num, person[i].name, person[i].sex, person[i].job, person[i].category.position);
    }
    return 0;
}