实践5

ex3

#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
    
    // 为vector<string>数组对象likes添加元素值 ( favorite book, music, film, paintings,anime,sport,sportsman,etc) 
    
    likes.push_back("favorite book");
    likes.push_back("music");        
    likes.push_back("film");
    likes.push_back("paintings");
    
    cout << "-----I like these-----" << endl;
    // 调用子函数输出vector<string>数组对象likes的元素值 
     
    output1(likes);

    // 为vector<string>数组对象dislikes添加元素值 
     
    dislikes.push_back("anime");
    dislikes.push_back("sport");
    dislikes.push_back("sportsman");
    dislikes.push_back("etc");
    
    cout << "-----I dislike these-----" << endl;
    // 调用子函数输出vector<string>数组对象dislikes的元素值 
    
    output1(dislikes);
    
    // 交换vector<string>对象likes和dislikes的元素值 
     
    likes.swap(dislikes); 
    
    cout << "-----I likes these-----" << endl;
    // 调用子函数输出vector<string>数组对象likes的元素值 
    
    output2(likes);
    
    cout << "-----I dislikes these-----" << endl;
    // 调用子函数输出vector<string>数组对象dislikes的元素值 
    
    output2(dislikes);    
                        
    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;
    
}

// 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) {
    
    vector<string>::iterator i; 
    for(i= v.begin() ; i<v.end() ; ++i)
    cout<<*i<<endl;
    

    
}

6-17

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

6-18

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

}