关于父类对象和子类对象相互转换问题

赵国梁

void average_age(CStudent* p_arr_stud, int n_size)
{
if (!p_arr_stud || n_size <= 0) return;

int total_age = 0;
EStudentType type = p_arr_stud[0].type;
for (int idx = 0; idx < n_size; ++idx)
{
switch (type)
{
case EStudentType_Xiao:
total_age += ((CXiaoStudent*)p_arr_stud)[idx].age;
break;
case EStudentType_Zhong:
total_age += ((CZhongStudent*)p_arr_stud)[idx].age;
break;
default:
break;
}
}

&#160; &#160; int aver_age = total_age / n_size;
&#160; &#160; switch (type)
&#160; &#160; {
&#160; &#160; case EStudentType_Xiao:
&#160; &#160;&#160; &#160;&#160;&#160;cout << "小学生的平均年龄是：" << aver_age << endl;
&#160; &#160;&#160; &#160;&#160;&#160;break;
&#160; &#160; case EStudentType_Zhong:
&#160; &#160;&#160; &#160;&#160;&#160;cout << "中学生的平均年龄是：" << aver_age << endl;
&#160; &#160;&#160; &#160;&#160;&#160;break;
&#160; &#160; default:
&#160; &#160;&#160; &#160;&#160;&#160;break;
&#160; &#160; }
}

赵国梁

我想问一下 EStudentType type = p_arr_stud[0].type;   这一步用父类指针 取子类的type值   步长不一样   会不会出错   

tony666

1.讲道理 type 和 age 应该在父类里定义比较好
2.步长不一样 ？？？ 看不懂
3.建议使用插入代码功能，这排版直接劝退