类的问题 [英] A problem with a classes

问题描述

我需要任何可以告诉我一个简单问题的人的帮助.这里有代码:

I need some help from anyone who can tell me about a simple problem.Here I have the code :

#include<iostream>
#include<string>
using namespace std;
class Person
{
private:
    string name;
public:
    int ID;
    int AGE;
    void setname(string);
    string getname();
};
void Person::setname(string thename)
{
    (name=thename);
}
string Person::getname()
{
    return name;
}
int main()
{
Person p;
string s;
cout<<"\nEnter the student name: ";
cin>>s;
p.setname(s);
cout<<"Enter the ID: ";
cin>>p.ID;
cout<<"Enter the age: ";
cin>>p.AGE;
cout<<"\nThe stduent name: "<<p.getname();
cout<<"\nThe stduent id: "<<p.ID;
cout<<"\nThe stduent age: "<<p.AGE<<endl;
system("PAUSE");
return 0;
}

因此，我想知道如何编写代码，例如.当我在打印信息中未键入ID或Name的任何数据时，我想告诉我不存在的数据并且不崩溃我的整个程序，请帮帮我，我当然需要:D

So I want to know how to write the code, ex. when I don''t type any data for ID or Name in the print information I want to show me that doesn''t exist and not to crash my entire programm, help me I need certainly :D

推荐答案

如果要检查字段是否存在，则必须编写一些检查代码.例如，当您要求输入内容时，您需要确保用户实际输入了有效的回复.不要接受直接进入类变量的项目，而是将它们读入临时区域并进行验证(它们是否必须是数字或字符，必须在特定范围内，等等)，并且仅保存有效条目.永远不要以为用户会a)理解您的问题并b)以预期的方式做出回应.

If you want to check that a field exists or not then you have to write some checking code. For example when you ask for some input you need to make sure the user actually enters a valid response. Don''t accept items direct into the class variables but read them into a temporary area and validate them (do they need to be numbers or characters, must they be within a specific range, etc), and only save valid entries. Never assume that the user will a) understand your question and b) respond in the way that''s expected.

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