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Xây dựng một hàm Class đơn giản và sử dụng

March 07, 2023
Hướng dẫn thực hành Xây dựng hàm Class đơn giản:


Code hướng dẫn:





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/*

Name: Quan ly thong tin toa do diem

Copyright: None

Author: Tran Anh

Date: 20/01/15 01:53

Description: http:/code.tavn.net

*/

#include<stdio.h>

#include<conio.h>

#include<iostream>

using namespace std;


class Diem{
private:
int x;
int y;
public:
void KhoiTao(int, int);
void NhapDiem();
void InDiem();
void DoiDiem(int, int);
int GiaTriX();
int GiaTriY();
};

void Diem::KhoiTao(int u, int v)
{
x=u;
y=v;
}
void Diem::NhapDiem()
{
cout<<"Nhap X: ";
cin>>x;
cout<<"Nhap Y: ";
cin>>y;
}
void Diem::InDiem()
{
cout<<"(X= "<<x<<", Y= "<<y<<")"<<endl;  //"endl;" la in xong xuong dong
}
void Diem::DoiDiem(int dx, int dy)
{
x+=dx;
y+=dy;
}
int Diem::GiaTriX()
{
return x;
}
int Diem::GiaTriY()
{
return y;
}

main()
{
cout<<"***DUNG BIEN THONG THUONG:"<<endl;
Diem a;
a.KhoiTao(5,3);
a.InDiem();
//Doi diem a dich chuyen x tang 1, y tang 2
a.DoiDiem(1,2);
a.InDiem();
//In gia tri X cua diem a
cout<<"X cua a= "<<a.GiaTriX()<<endl;
//In gia tr Y cua diem a
cout<<"Y cua a= "<<a.GiaTriY()<<endl;
//Thu nhap diem cho a
a.NhapDiem();
a.InDiem();

cout<<endl<<"***DUNG BIEN CON TRO:"<<endl;
Diem *p;
p =  new Diem;
//Khoi tao diem p con tro
p->KhoiTao(7,4);
p->InDiem();
//Nhap diem p con tro
p->NhapDiem();
p->InDiem();
//Doi diem X tang them 6, Y tang them 7
p->DoiDiem(6,7);
p->InDiem();
//Gia tri X cua P con tro
p->GiaTriX();
//Gia tri Y cua P con tro
p->GiaTriY();


cout<<endl<<"***DUNG MANG DAY SO:"<<endl;
Diem ds[7];

for(int i=0;i<7;i++)
ds[i].KhoiTao(i,i);
for(int i=0;i<7;i++)
{
cout<<" ";
ds[i].InDiem();
}

cout<<endl<<"***TRUY XUAT THEO YEU CAU:"<<endl;
cout<<"- Truy xuat gia tri X cua a: "<<endl;
cout<<"X= "<<a.GiaTriX();

cout<<endl;

cout<<"- Truy xuat gia tri X cua con tro P: "<<endl;
cout<<"X= "<<p->GiaTriX();

cout<<endl;

cout<<"- Truy xuat gia tri X cua phan tu ds[4]: "<<endl;
cout<<"X= "<<ds[4].GiaTriX();

cout<<endl;

cout<<"Tao mot ban sao b giong a: "<<endl;
Diem b=a;  //Don gian la gang cho b gia tri bang a
b.InDiem();

getch();
}






>







/*
Name: Quan ly thong tin Sinh vien
Copyright: None
Author: Tran Anh
Date: 20/01/15 01:53
Description: http:/code.tavn.net
*/
#include<conio.h>
#include<stdio.h>
#include<iostream>
using namespace std;

class SinhVien
{
private:
    char mssv[15];
    char *hoten;
    int namsinh;
    float diem;
public:
    SinhVien();
    SinhVien(char*, char*, int,float);
    ~SinhVien();
    void Nhap();
    void Inthongtin();
    char* XepLoai();
    float GiaTriDiem();
};


SinhVien::SinhVien()
{
    strcpy(mssv,"");
    hoten=new char[200];
    strcpy(hoten,"");
    namsinh=1900;
    diem=0;
}

SinhVien::SinhVien(char* ms, char* ht, int ns, float d)
{
    strcpy(mssv,ms);
    hoten= new char[200];
    strcpy(hoten,ht);
    namsinh=ns;
    diem=d;
}

SinhVien::~SinhVien()
{
    delete[] mssv;
    delete hoten;

}

void SinhVien::Nhap()
{
    cout<<"Ma so sinh vien: ";
    cin>>mssv;

    cout<<"Ho va ten: ";
    cin.ignore();
    cin.getline(hoten,199);
    cout<<"Nam sinh: ";
    cin>>namsinh;
    cout<<"Diem trung binh: ";
    cin>>diem;
}

void SinhVien::Inthongtin()
{
    cout<<endl;
    cout<<"Ten: "<<hoten<<"   |   "<<mssv<<"   |   "<<namsinh<<"    |    "<<diem<< endl;

}

float SinhVien::GiaTriDiem()
{
    return diem;
}
char* SinhVien::XepLoai()
{
    char* xl;
    xl= new char[10];
    if(diem<=10) strcpy(xl,"Gioi");
    if(diem<8) strcpy(xl,"Kha");
    if(diem<6.5) strcpy(xl,"Trung Binh");
    if(diem<5) strcpy(xl,"Yeu");
    return xl;
}
main()
{

    SinhVien a;
  //  a.Nhap();
    //a.Inthongtin();

    SinhVien b("13D480201016","Tran Anh", 1999, 4.0);
    b.Inthongtin();

    cout<<"\nGia tri diem b: "<<b.GiaTriDiem();
    cout<<"\nXep loai: "<<b.XepLoai();

    getch();

}




>







/*
    Name: Class phong hoc
    Authr: Tran Anh
    Copyright: None
    Communication: http://code.tavn.net

*/
#include<conio.h>
#include<stdio.h>
#include<iostream>
#include<string.h>
using namespace std;

class Room
{
private:
    char RoomCode[20];
    char* RoomName;
    int Quantity;
public:
    Room();
    void InpRoom();
    void OutRoom();
};

Room::Room()
{
    strcpy(RoomCode,"");
    RoomName=new char[255];
    strcpy(RoomName,"");
    Quantity=0;
}

void Room::InpRoom()
{
    cout<<"\t- Nhap ma phong: ";
    cin>>RoomCode;
    cin.ignore();
    cout<<"\t- Nhap ten phong: ";
    cin.getline(RoomName,100);
    cout<<"\t- Nhap so luong cho ngoi: ";
    cin>>Quantity;
}

void Room::OutRoom()
{
    cout<<"\n\t=> Phong "<<RoomCode<<" : "<<RoomName<<" : "<<Quantity<<" cho ngoi"<<endl;
}

main()
{
    Room a;
    a.InpRoom();
    a.OutRoom();

    getch();
    return 0;
}






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/*
    Name: Quan ly mon an
    Authr: Tran Anh
    Copyright: None
    Communication: http://code.tavn.net

*/

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

class MonAn
{
private:
    char MaMonAn[];
    char* TenMonAn;
    int SoLuong;
    int DonGia;
public:
    MonAn();
    void NhapTT();
    void InTT();
    int GetDonGia();
};

MonAn::MonAn()
{
    strcpy(MaMonAn,"");
    TenMonAn=new char[200];
    strcpy(TenMonAn,"");
    SoLuong=0;
    DonGia=0;
}

void MonAn::NhapTT()
{
    cout<<"\tNhap thong tin mon:"<<endl;
    cout<<"Ma mon: "; cin>>MaMonAn;
    fflush(stdin);
    cout<<"Ten mon: "; cin.getline(TenMonAn,200);
    cout<<"Don gia: "; cin>>DonGia;
}



void MonAn::InTT()
{

    cout<<MaMonAn<<"\t"<<TenMonAn<<"\t\t"<<"( "<<DonGia<<" dong)"<<endl;
}

int MonAn::GetDonGia()
{
    return DonGia;
}


main()
{

    MonAn a[100];
    char key;
     int i=0;

    cout<<"\t\tNHAP THONG TIN NHIEU MON AN\n";
    cout<<"\t i: Nhap so moi"<<endl;
    cout<<"\t p: In lai danh sach mon an da nhap"<<endl;
    cout<<"\t q: In ra danh sach mon an theo thu tu tang dan cua don gia\n";



    while(1){
        fflush(stdin);
      cout<<"\n- Chon thao tac: "; cin>>key;


            if(key=='i')
            {
                i++;
                a[i].NhapTT();
            }


            if(key=='p')
            {
                int n=i;
                cout<<"\n\t Danh sach mon an da nhap:"<<endl;
                for(int i=1;i<=n;i++)
                    a[i].InTT();
            }


            if(key=='q')
            {
                int n=i;
                cout<<"\n\t Danh sach "<<n<<" mon an da nhap:"<<endl;

                for(int i=1;i<n;i++)
                    for(int j=i+1;j<=n;j++)
                        if((a[i].GetDonGia())>(a[j].GetDonGia()))
                            {
                                MonAn k;
                                k=a[i];
                                a[i]=a[j];
                                a[j]=k;
                            }


                for(int i=1;i<=n;i++)
                    a[i].InTT();
                 
                    i=0; // tra don hang ve khong khi da t
            }

    }
    getch();
}




Key:
 

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