#include<iostream>
#include<string>
using namespace std;

struct person
{
    string name;
    int num;
    char sex;
    char job;
    union P
    {
        float grade;
        string prof;
    }kind;

};

int main()
{
    int i;
    person stu[3];
    cout<<"请输入职员信息："<<endl;
    for(i=0;i<3;i++)
    {
        cin>>stu[i].name>>stu[i].num>>stu[i].sex>>stu[i].job;
        if(stu[i].job=='t')
            cin>>stu[i].kind.prof;
        else
            cin>>stu[i].kind.grade;
    }
    cout<<"列表内学生信息为："<<endl;
    for(i=0;i<3;i++)
    {
        if(stu[i].job=='t')
            cout<<stu[i].name<<'_'<<stu[i].num<<'_'<<stu[i].sex<<'_'<<stu[i].job<<'_'<<stu[i].kind.prof<<endl;
        else
            cout<<stu[i].name<<'_'<<stu[i].num<<'_'<<stu[i].sex<<'_'<<stu[i].job<<'_'<<stu[i].kind.grade<<endl;
    }

}

编译信息？？？？

还得说出编译器和版本号，因为我看到union中有non-POD成员

简单说说：

struct person
{
    string name;
    int num;
    char sex;
    char job;
    struct P
    {
        float grade;
        string prof;
    }kind;

};

编译信息大概是这样哒：

Compiling...
Cpp1.cpp
C:\Users\123\Desktop\practice 5\Cpp1.cpp(14) : error C2621: union 'P' : member 'prof' has copy constructor
C:\Users\123\Desktop\practice 5\Cpp1.cpp(28) : error C2039: 'prof' : is not a member of 'P'
        C:\Users\123\Desktop\practice 5\Cpp1.cpp(12) : see declaration of 'P'
C:\Users\123\Desktop\practice 5\Cpp1.cpp(36) : error C2039: 'prof' : is not a member of 'P'
        C:\Users\123\Desktop\practice 5\Cpp1.cpp(12) : see declaration of 'P'
C:\Users\123\Desktop\practice 5\Cpp1.cpp(41) : warning C4508: 'main' : function should return a value; 'void' return type assumed
执行 cl.exe 时出错.

Cpp1.exe - 1 error(s), 0 warning(s)

我给union类型改成struct类型 编译就通过啦！

是不是因为编译器的问题？

C++11之前的union必须要求成员为POD类型，C++11就放宽限制了