请帮我看看为什么程序中的结果不对

请帮我看看为什么程序中的结果显示ID不是我所设置的值
#include<iostream>
using namespace std;

const int namesize=20;
const int phonesize=10;
const int idsize=10;

struct employee
{
    char name[namesize];
    char phone[phonesize];
    int   ID[idsize];
};

void showmember(employee a)
{
       cout<<"officer's data is:"<<endl;
        cout<<"name:"<<a.name<<endl;
        cout<<"phone:"<<a.phone<<endl;
        cout<<"ID:"<<a.ID<<endl;
}
void changename(employee & a, char newname[])
{
    strcpy(a.name, newname);
    return;
}




int main()
{

        employee a={"abc", "456464", 646};
        employee b={"juopik", "6646", 4434};
    showmember(a);
    showmember(b);
    changename(a, "tom");
    cout<<"after change the name"<<endl;
    showmember(a);
    
    return 0;
}