Question

我一直在研究一个使用课程的程序。我知道setter和getter用于访问私有成员，但如果我使用getInput()在类中输入数据，我还需要setter和getter吗？

#include <iostream>
#include<conio.h>
using namespace std;

void printList();
void delete_end_node();

struct list
{
    list *head, *tail;
    list *next;
};

class node 
{ 
    private:
        string name; // Name 
        int age; // Age in integer 
        float height; // In meters  

    public:
        node *next; // Pointer to next node 
        node *head, *tail;
        node *start_ptr = NULL; // Start Pointer (root)
        node *temp;
        node *temp2;

        node()
        {
            head = NULL;
            tail = NULL;
        }

        void printList();
        void delete_end_node();
        void search();

        void getInput()
        {

            int total;
            cout<< "How many you want to input? ";
            cin>> total;
            for (int i=0; i<total; i++)
            {
                temp = new node;
                cout << "Please enter the name of the person: "; 
                cin >> temp->name; 
                cout << "Please enter the age of the person : "; 
                cin >> temp->age; 
                cout << "Please enter the height of the person : "; 
                cin >> temp->height; 

                temp->next = NULL; // Sets the node to be the last node
                if (start_ptr == NULL) 
                    start_ptr = temp;
                else
                { 
                    temp2 = start_ptr; // We know temp2 is not NULL - list not empty! 
                    while (temp2->next != NULL) // The loop will terminate when temp2 
                        temp2 = temp2->next;    // points to the last node in the list 
                                                // Move to next link in chain 
                    temp2->next = temp; // Sets the pointer from that last node to point 
                                        // to the node that has just declared
                }
            }

        }

    //Constructor
    node(string node_name, int node_age, float node_height)
    {name = node_name; age = node_age; height = node_height;}

    // SET
    setName(string node_name){name = node_name;}
    setAge(int node_age){age = node_age;}
    setHeight(float node_height){height = node_height;}
    // GET
    string getName(){return name;}
    int getAge(){return age;}
    float getHeight(){return height;}   

}; 


node *start_ptr = NULL; // Start Pointer (root)

int main()
{
    node *temp;
    node *temp2;
    node obj;
    int choice;
    cout << "MAIN MENU:\n\n1. ADD\n2. DISPLAY\n3. DELETE\n4. EXIT\n";
    cin>> choice;
    system("cls");

    while(choice!=4)
    {
        switch(choice)
        {
            case 1:
            {
                cout<<"ADD"<<endl;
                obj.getInput(); // This where it stops
                system ("pause");
                break;
            }

            case 2:
            {
                cout<<"DISPLAY"<<endl;
                temp->printList();
                system ("pause");
                break;
            }

            case 3:
            {
                cout<<"Deleting the last node";
                temp->delete_end_node();

                temp->printList();
                //Deleting all the nodes
                temp2 = start_ptr; // We know temp2 is not NULL - list not empty! 
                while (temp2 != NULL) 
                {
                    start_ptr = start_ptr->next;
                    delete temp2;       // points to the last node in the list 
                    temp2 = start_ptr;
                }
                system ("pause");
                break;
            }

            case 4:
            {
                cout<< "EXIT...";
                break;
            }

            default:
                continue;
        } // END SWITCH CASE
    } //END WHILE
    return 0;
} // END MAIN

Answer 1

你从不需要一个setter和getter。它们是一种常见模式，在Java和C＃等解释字节码语言中更常见。

作为一般规则，您通常不会需要它;不要编写你不会使用的代码。

解决代码无法正常工作的过程称为＆＃34;调试＆＃34;。您可以在＆＃34;调试器＆＃34;中启动您的程序。找到它不起作用的地方，或者一步一步地检查状态。您可以检查程序的状态并尝试发现您不期望的内容，例如指针为空或内存已损坏或未初始化。

Here is a youtube lecture on how to debug a C++ program;它可能有所帮助（我真的用谷歌搜索＆＃34;如何调试C ++＆＃34;并链接第一个视频，我希望它不会吮吸）。 Stackoverflow不是为我调试我的程序＆＃34;服务。

程序使用链接列表插入数据时停止工作

1 个答案: