c++ - 输出错误

Question

我目前正在自学 C/C++，并且我得到了练习(来 self 正在阅读的书)来编写一个可以产生如下输出的程序:

Enter your first name: Flip
Enter your last name: Fleming
Here’s the information in a single string: Fleming, Flip

使用结构。但是我的输出是这样的:

Enter your first name: Flip
Enter your last name: Fleming
Here’s the information in a single string: , 

这是代码。它相当简短，因此应该不难阅读:)

#include <iostream>
#include <cstring>

using namespace std;

struct Person {
    char* firstName;
    char* lastName;
};

char* getName(void);

int main() {
    Person* ps = new Person;
    cout << "Enter your first name: ";
    char* name;
    name = getName();
    ps->firstName = name;
    cout << "Enter your last name: ";
    char* lastname;
    lastname = getName();
    ps->lastName = lastname;
    cout << "Here's the information in a single string: "
            << ps->lastName << ", " << ps->firstName;
    delete ps;
    delete name;
    delete lastname;

    return 0;
}

char* getName() {
    char temp[100];
    cin >> temp;
    cin.getline(temp, 100);
    char* pn = new char[strlen(temp) + 1];
    strcpy(pn, temp);

    return pn;
}

Answer 1

首先，没有 C/C++ 这样的东西。你在混合它们，这是错误的。由于您使用的是 C++ header /new/using，因此我假设您需要 C++，因此请按以下方式修复代码:

• 将所有 char* 和 char[] 替换为 std::string
• 摆脱动态分配

因此，一些更改将是:

struct Person {
    std::string firstName;
    std::string lastName;
};

或

Person ps;