默认实参不在形参列表的结尾 ; 缺少参数 5 的默认参数 ; 未定义标识符??

#include<fstream>
using namespace std;
class computer
{
private:
    char disk[20],CPU[20],firm[20],type[20];
    int price,date;
public:
    computer(  char *d = new char[20] , char *C = new char[20] , char *f = new char[20], char *t = new char[20],int p,int m)
    {
        strcpy(disk,d);
        strcpy(CPU,C);
        strcpy(firm,f);
        strcpy(type,t);
        price = p;
        date = m;
    }
    void show_disk()
    {
        cout << disk << endl;
    }
    void show_CPU()
    {
        cout << CPU << endl;
    }
    void show_firm()
    {
        cout << firm << endl;
    }
    void show_price()
    {
        cout << price << endl;
    }
    void show_date()
    {
        cout << date << endl;
    }
    void show_type()
    {
        cout << type << endl;
    }
    void show_all()
    {
        cout << "disk:" << disk << endl << "CPU:" << CPU << endl << "firm:" << firm <<endl << "type:" << type << endl  << "price:" << price << endl << "date:" << date << endl;
};
};
void main()
{
    computer acer( seagate，interl , china , sa000 , 4999 , 20110411 );
}