类对象的选择排序数组

selection sorting array of class objects

本文关键字:排序 数组 选择 对象      更新时间:2023-10-16

我有一个部分工作的选择排序算法,我使用它按年龄对类对象数组进行排序,当它这样做时,它会正确对某些内容进行排序,但无法对第一个元素进行排序。 还有没有办法为类使用赋值运算符来简化此操作。

谢谢

以下是我的完整代码:

#include <iostream>
#include <string>
#include <math.h>
using namespace std;
void storeinfo() ;
void showinfo() ;
void menu() ;
void deleteinfo() ;
void displayallinfo() ;
void selectionSort() ;
int linsearch(string val) ;

class user 
{
    string firstname, lastname, currentteam, position, status ;
    int age ;
public:
    user() {};
    user(string fname, string lname, string cteam, string pos, string stat, int age) 
    {
        setFirstName(fname);
        setLastName(lname);
        setCurrentTeam(cteam);
        setPosition(pos);
        setStatus(stat);
        setAge(age);
    } ;

    user& operator = (const user& source)
    {
        firstname = source.firstname;
        lastname = source.lastname ;
        currentteam = source.currentteam ;
        position = source.position ;
        status = source.status ;
        age = source.age ;
    }

    void setFirstName(string fname)
        {firstname = fname;}
    void setLastName(string lname)
        {lastname = lname;}
    void setCurrentTeam(string cteam)
        {currentteam = cteam;}
    void setPosition(string pos)
        {position = pos;}
    void setStatus(string stat)
        {status = stat;}
    void setAge(int _age)
        {age = _age;}
    string getFirstName()
        {return firstname ;}
    string getLastName()
        {return lastname ;}
    string getCurrentTeam()
        {return currentteam ;}
    string getPosition()
        {return position ;}
    string getStatus()
        {return status ;}
    int getAge()
        {return age ;}
};
user player[20] ;
int arrlength = 3 ;
int main()
{
    menu() ;
    cin.get() ;
    return 0 ;
}
void storeinfo()
{
    string firstname ;
    string lastname ;
    string currentteam ;
    string position;
    string status ;
    int age ;
    for (int i=0; i < 3; i++)
    {
        cout << "nn Enter First Name : " ; 
        cin >> firstname ;
        player[i].setFirstName(firstname) ;
        cout << "Enter Last Name : " ; 
        cin >> lastname ;
        player[i].setLastName(lastname) ;
        cout << "Enter Player's Age : " ; 
        cin >> age;
        player[i].setAge(age) ;
        cout << "Enter Current Team : " ; 
        cin >> currentteam ;
        player[i].setCurrentTeam(currentteam) ;
        cout << "Enter Position : " ; 
        cin >> position ;
        player[i].setPosition(position) ;
        cout << "Enter Status : " ; 
        cin >> status ;
        player[i].setStatus(status) ;
        cout << "nnn" ;
    }
    /*cout << string(50, 'n');*/
    menu() ;
}
void showinfo()
{
    string search;
    int found ;

    cout << "Please Enter The Player's Last Name : " ;
    cin >> search ;
    found=linsearch(search);
    if (found==-1)
    {
        cout << "n There is no player called " << search ;
    }
    else
    {
        cout << "n First Name : " << player[found].getFirstName() << "n" << "Last Name : " << player[found].getLastName() <<
            "n" << "Age : " << player[found].getAge() << "n" << "Current Team : " << player[found].getCurrentTeam() << 
            "n" << "Position : " << player[found].getPosition() << "n" << "Status :  " << player[found].getStatus()  << "nn";
    }
    cin.get() ;
    menu() ;
}
void deleteinfo()
{
    int arrlength = 3 ;
    string search ;
    int found ;
    cout << "n Delete A Player's Information nn" ;
    cout << "Please Enter The Player's Last Name : " ;
    cin >> search ;
        found=linsearch(search);
    if (found==-1)
    {
        cout << "n There is no player called " << search ;
    }
    else
    {
        for (int i=found + 1; i < arrlength; ++i)
        {
            player[i-1].setFirstName(player[i].getFirstName()) ;
            player[i-1].setLastName(player[i].getLastName()) ;
            player[i-1].setAge(player[i].getAge()) ;
            player[i-1].setCurrentTeam(player[i].getCurrentTeam()) ;
            player[i-1].setPosition(player[i].getPosition()) ;
            player[i-1].setStatus(player[i].getStatus()) ;
        }
        --arrlength ;
        cout << "n Player has been deleted." ;
        player[arrlength].setAge(0) ;
        player[arrlength].setCurrentTeam("") ;
        player[arrlength].setFirstName("") ;
        player[arrlength].setLastName("") ;
        player[arrlength].setPosition("") ;
        player[arrlength].setStatus("");
    }
    cin.get() ;
    menu() ;
}
void displayallinfo()
{
    selectionSort();
    for (int i=0; i < 3; i++)
    {
        cout << "n First Name : " << player[i].getFirstName() << "n" << "Last Name : " << player[i].getLastName() <<
            "n" << "Age : " << player[i].getAge() << "n" << "Current Team : " << player[i].getCurrentTeam() << 
            "n" << "Position : " << player[i].getPosition() << "n" << "Status :  " << player[i].getStatus()  << "nn";
    }
    cin.get() ;
    menu() ;
}
void menu()
{
    cout << "nn MENU" << "n" ;
    cout << "n A. Store Player Information" ;
    cout << "n B. Show Player Informaton" ;
    cout << "n C. Delete Player Information" ;
    cout << "n D. Display All Players Sorted By Age";
    cout << "n Z. Exit nn" ;
    string x =  "";
    cin >> x ;
    if (x=="a" | x=="A")
    { 
        storeinfo() ;
    }
    else if (x=="b" | x=="B")
    {
        showinfo() ;
    }
    else if (x=="c" | x=="C")
    {
        deleteinfo() ;
    }
    else if (x=="d" | x=="D")
    {
        displayallinfo() ;
    }
    else if (x=="z" | x=="Z")
    {
        exit(0) ;
    }
    else
    {
        cout << "Invalid Choice" ;
        menu() ;
    }
}
int linsearch(string val)
{
    for (int j=0; j <= 3; j++)
    {
        if  (player[j].getLastName()==val)
         return j ;         
    }
        return -1 ;
}
void selectionSort()
{
    int i, minIndex, minValue;
    for (i = 0; i < (arrlength - 1); i++)
    {
        minIndex = i ;
        minValue = player[i].getAge() ;
        for (int index = i + 1; index < arrlength; index++)
        {
            if (player[index].getAge() < minValue)
            {
                minValue = player[index].getAge();
                minIndex = index;
            }
        }
        player[minIndex].setAge(player[i].getAge());
        player[i].getAge() == minValue;
    }

}

你的"user"类非常简单,不需要重载赋值运算符,因为它的所有成员都是普通的旧数据类型,或者已经有自己的赋值运算符(如字符串)。我建议从此类中删除 operator= 方法,这样您在添加新成员时就无需维护 operator= 方法。 如果需要,C++ 将为您的类自动生成赋值运算符(执行成员赋值)。 当你的成员是指针时,你真的只需要一个重载的赋值运算符,但我跑题了。

您的选择排序函数实际上并没有对球员进行排序。它只是重新排列每个玩家的"年龄"值。 我认为这就是您要实际"排序"播放器"数组的操作。 (请注意,这比"C++"更"C",但请耐心等待)。

void SimpleButSlowSort()
{
    bool fSorted = false;
    if (arrLength <= 1)
    {
       return;
    }
    while (fSorted)
    {
        fSorted = true;
        for (int index = 0; index < arrLength-1; index++)
        {
            if (player[index].getAge() > player[index+1].getAge())
            {
                user temp;
                temp = player[index];
                player[index] = player[index+1];
                player[index+1] = temp;
                fSorted = false;   
            }   
        }
    }
}

但是,如果您想要一种更C++标准的排序方式,则可以为此使用标准库。但这要求玩家处于可以迭代的类型。 例

bool MyPlayerCompare(user& u1, user& u2) { return (u1.getAge() < u2.getAge()); }
std::vector<user> players;
void FasterSort()
{
    std::sort(players.begin(), players.end(), MyPlayerCompare);
}