C++ 地址簿

Question

我试图做到这一点，如果 userselection = 1，则系统会询问用户问题以创建他们的地址簿联系人。它将所有联系信息保存到一个结构中，然后保存到一个 .txt 文件中。我对 C++ 很陌生。这就是我到目前为止所拥有的......我一直在'.'之前收到[Error] expected primary-expression token. <---- 我该如何解决这个问题另外，任何人都可以提供有关如何将结构保存到文件的指导吗？谢谢

#include <cstdlib>
#include <iostream>
#include <fstream>

using namespace std;



struct person{
         string Name;
         string Address;
         string PhoneNumber;
         string Email;
             };

 int main(){
int userselection = 0;


cout << "What do you want to do? Press 1 to Add Contact -- Press 2 to Search       for Contact"<<endl;
 cin >> userselection;


if(userselection == '1');
  person newPerson;
  cout << "What is your Name?" << endl;
  cin >> person.Name;
  cout << "What is your Address?" << endl;
  cin >> person.Address;
  cout << "What is your Phone Number?" << endl;
  cin >> person.PhoneNumber;
  cout << "What is your Email?" << endl;
  cin >> person.Email;


  }

Answer 1

对于您描述的错误，您需要访问 class 实例中的成员，而不是 class 定义中的成员..

newPerson.Name

而不是

person.Name

Answer 2

你的错误只与语法有关。以后请阅读编译器的错误消息。

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

struct person {
    string Name;
    string Address;
    string PhoneNumber;
    string Email;
};

int main() {
    int userselection = 0;

    cout << "What do you want to do? Press 1 to Add Contact -- Press 2 to Search for Contact"<<endl;
    cin >> userselection;

    if(userselection == 1) { // userselection is int so why compare it to char
        person newPerson;
        cout << "What is your Name?" << endl;
        cin >> newPerson.Name; // assign to object's member not a static member
        cout << "What is your Address?" << endl;
        cin >> newPerson.Address;
        cout << "What is your Phone Number?" << endl;
        cin >> newPerson.PhoneNumber;
        cout << "What is your Email?" << endl;
        cin >> newPerson.Email;
    }

}

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