实验五

#include <iostream>
#include <vector>
#include <string>
using namespace std;

// 函数声明 
void output1(vector<string> &);  
void output2(vector<string> &);  

int main()
{
    vector<string>likes, dislikes; // 创建vector<string>对象likes和dislikes
    likes.push_back("favorite book"); 
    likes.push_back("music");
    likes.push_back("film");
    likes.push_back("paintings");
    likes.push_back("anime");
    likes.push_back("sport");
    likes.push_back("sportsman");
    likes.push_back("etc");
    // 为vector<string>数组对象likes添加元素值 ( favorite book, music, film, paintings,anime,sport,sportsman,etc) 
 
    cout << "-----I like these-----" << endl;
    output1(likes);
    // 调用子函数输出vector<string>数组对象likes的元素值 
 
    dislikes.push_back(" ") ;
        // 为vector<string>数组对象dislikes添加元素值 
   
    cout << "-----I dislike these-----" << endl;
    output1(dislikes);
    // 调用子函数输出vector<string>数组对象dislikes的元素值 
        likes.swap(dislikes);
    // 交换vector<string>对象likes和dislikes的元素值 
    // 补足代码
    cout << "-----I likes these-----" << endl;
    output2(likes);
    // 调用子函数输出vector<string>数组对象likes的元素值 
 
    cout << "-----I dislikes these-----" << endl;
    output2(dislikes);
    // 调用子函数输出vector<string>数组对象dislikes的元素值 
                
    return 0;
}
// 函数实现 
// 以下标方式输出vector<string>数组对象v的元素值  
void output1(vector<string> &v) {
    for(int i=0;i<v.size();i++){
        cout<<v[i]<<' '<<endl;
    }
    // 补足程序
}

// 函数实现
// 以迭代器方式输出vector<string>数组对象v的元素值 
void output2(vector<string> &v) {
    for ( vector<string>::iterator it = v.begin(); 
    it != v.end(); it++ ) 
           cout << *it << ' '<<endl;
    // 补足程序
}

 

6-17

#include<iostream>
using namespace std;
int main(){   
    int a,*p=&a;
        *p=9;
     cout<<"the value of a is :"<<*p;
     return 0;
}

6-18

#include<iostream>
using namespace std;
int fn1()
{
    int *p=new int (5);
    return *p;
    delete p; 
}
int main()
{
    int a=fn1();
    cout<<"the value of a is:"<<a<<endl;
    return 0;
}

 

 

 

 

 

 

 

 

1

#include<iostream>
#include<stdlib.h>
#include<time.h>
using namespace std;

class Dice {
    public:
        Dice(int n);
        int cast();
    private:
        int sides;
};
Dice::Dice(int n)
{
    sides=n;
}

int Dice::cast()
{
    int val;
    val=(rand() % (sides + 1) + 1);
    return val;
}
int main() {
    srand((unsigned)time(NULL));
    int a,b,c,d;
    cout<<"请输入班级人数及你的学号"<<endl;   
    cin>>a>>b;
    Dice x1(a);
    for(int i=0;i<500;i++){    
    c=x1.cast();
    if(c==b){
        d++;}
    }
    cout<<"学号被抽中的概率为"<<endl;
    cout<<d<<"/500"<<endl;
    return 0;
}

2

#include<iostream>
#include<string>
using namespace std;
static int n=999;
class User {
private:
    int id; string name; string password; static int CurrentID;
public:
    User(string s1,string s2="111111") {
        n++; id = n;
        name = s1; password = s2; CurrentID++;
    }
    User(User &u1) {
        id = u1.id; name = u1.name; password = u1.password; CurrentID = u1.CurrentID;
    }
    void show1() {
        cout << "该用户信息为 id:" << id << " name:" << name << " password:" << password << endl;
    }
    static void show2(User &u1) {      //输出CurrentID
        cout << "CurrentID:" << CurrentID << endl; cout << "最后一个新增用户为:";
        u1.show1();
    }
    void change() {                         //修改密码
        string s3, s4; int j; j = 3;
        while (j) {
            cout << "请输入原有密码:"; cin >> s3;
            if (s3 == password) {
                cout << "请输入新密码:"; cin >> s4;
                password = s4; break;
            }
            if (s3 != password) {
                j--; cout << "输入原密码错误！" << endl;
            }
        }
        if (j == 0)cout << "错误次数过多，请稍后再试" << endl;
    }
}; int User::CurrentID = 999;//给CurrentID赋初值
int main() {
    User u1("user1", "123456");
    User u2("user2");
    User u3("user3", "234567");
    u1.show1(); u2.show1(); u3.show1(); User u(u3); User::show2(u3);
    u1.change(); u1.show1();
    u2.change();
    return 0;
}

3

#include "book.h"
#include <vector>
#include <iostream>
using namespace std;

int main()
{
    // 定义一个vector<Book>类对象
    // 补足程序
    // ... 
     vector<Book>book;
     
    string isbn, title;
    float price;
    
    // 录入图书信息，构造图书对象，并添加到前面定义的vector<Book>类对象中
    // 循环录入，直到按下Ctrl+Z时为止 (也可以自行定义录入结束方式） 
    // 补足程序
    while(cin>>isbn>>title>>price)
    {
        Book b(isbn,title,price);
        book.push_back(b);
    }
    
    // 输出入库所有图书信息
    // 补足程序
    for(int i=0;i<book.size();i++)
        book[i].print();
    
    return 0;
}