共用体类型数据的特点

#include <iostream>
#include <string.h>
#include <iomanip>
/* run this program using the console pauser or add your own getch, system("pause") or input loop */
using namespace std;
struct person
{
    int num;
    char name[10];
    char sex;
    char job;
    union p
    {
        int grade;
        char position[10];
    }category;
} 
person[2];

int main(int argc, char** argv) {
    int i;
    for(i=0;i<2;i++)
    {
        cin>>person[i].num>>person[i].name>>person[i].sex>>person[i].job;
        if(person[i].job=='s')
        cin>>person[i].category.grade;
        else if(person[i].job=='t')
        cin>>person[i].category.position;
    }
    cout<<endl<<"No. Name sex job grade/position"<<endl;
    for(i=0;i<2;i++){
        if(person[i].job=='s')
        cout <<person[i].num<<setw(6)<<person[i].name<<" "<<person[i].sex<<" "<<person[i].job<<setw(10)<<person[i].category.grade<<endl;
        else
        cout <<person[i].num<<setw(6)<<person[i].name<<" "<<person[i].sex<<" "<<person[i].job<<setw(10)<<person[i].category.position<<endl;
    }
    return 0;
}