Question

我试图这样做，如果userselection = 1，则会询问用户问题以创建地址簿的联系人。它将所有联系人信息保存到结构中，然后保存到.txt文件。我是C ++的新手。这就是我到目前为止......我一直在'。'之前得到 [Error]期望的primary-expression。令牌。＆lt; ----我如何修复此问题此外，任何人都可以提供如何将结构保存到文件的指导？感谢。

#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，您需要访问类实例中的成员，而不是类定义..

newPerson.Name

而不是

person.Name

Answer 2

您的错误只与语法有关。请在将来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;
    }

}

C ++地址簿

2 个答案: