[积累]vector的详细使用, 包括iterator_vector<fat>::iterator itr = fat.begin() + i;-优快云博客

本文链接：https://blog.youkuaiyun.com/sfshine/article/details/44586961

本文介绍了一个简单的电话簿管理系统实现，该系统利用C++编程语言完成基本的增加、读取、删除及修改联系人操作。通过类定义、向量容器的应用以及迭代器的使用，展示了面向对象编程思想在实际问题中的应用。

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

class Phone
{

private:
    string name;
    string num;

public:
    Phone(string n , string nm){
        name = n;
        num = nm;

    }
    string getName(){

        return name;
    }
    string getNum(){

        return num;
    }
    void setNum(string mynum){
        num = mynum;
    }

};//注意分号! 

vector<Phone*> phones;

void add(){

    string phone1;
    //Add
    while (true)
    {
        cin>>phone1;
        if(!phone1.compare("Q"))
            break;
        string name = phone1.substr(0 ,phone1.find_first_of(","));
        string num = phone1.substr(phone1.find_first_of(",")+1, phone1.length());
        Phone* a = new Phone(name,num);
        phones.push_back(a);

    }
}
void read(){
        //Read
        for (vector<Phone*>::size_type j = 0; j != phones.size(); ++j)
        {
            Phone* phone = phones[j];
            cout <<"Reading: "<< phone->getName()<<" Num: "<<phone->getNum()<<endl;
        }
}

void read_iterator(){
//使用iterator
     for(vector<Phone*>::iterator itr1 = phones.begin();itr1!=phones.end();++itr1){
		Phone*phone=*itr1;
		cout<<"Reading:"<<phone->getName()<<"Num:"<<phone->getNum()<<endl; 
     }
}

void mydelete(){
    //Delete
    cout<<"input what you want delete: ";
    string removeword;
    cin>>removeword;

    vector<Phone*>::iterator itr = phones.begin();
    while (itr != phones.end())
    {
        if (!removeword.compare((*itr)->getName())){ //如果两个字符串相等, compare将返回0 
            cout << "Deleting: "<< (*itr)->getName()<<endl;
            itr = phones.erase(itr); //注意如何删除! 
        }else
        {
          ++itr;
        }

    }}

void modify(){ //modify
    vector<Phone*>::iterator itr1 = phones.begin();
    while (itr1 != phones.end())
    {

        string modifyword = "gb";
        if (!modifyword.compare((*itr1)->getName())){
            cout << "Modifying: "<< (*itr1)->getName()<<endl;
            (*itr1)->setNum("0000000");}

        ++itr1;
    }}

int main()
{
    add();
    read();
    mydelete();
    modify();
    cout<<"After motifying use iterator read: " <<endl;
    read_iterator();
    return 0;
}