C++ STL标准模板库vector基础-优快云博客

本文介绍了C++中vector容器的使用，包括基本操作如元素赋值、输出和动态扩容，以及如何将Person类实例化到vector中。还展示了如何通过指针管理动态存储的对象。

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


void test(vector<int>& v) {
    int size = v.size();
    for (int i = 0; i < size; i++) {
        cout << "v[" << i << "] = " << v[i] << endl;
    }
}
void main01() {

    // vector是一个模板类，在使用模板类时，需要指明具体类型
    vector<int> v1(10);
    for (int i = 0; i < 10; i++) {
        v1[i] = i + 1;
    }

    for (int i = 0; i < 10; i++) {
        cout << "v[" << i << "] is " << v1[i] << endl;
    }

    vector<int> v2(20);
    v2 = v1;

    test(v2);

    cout << "----------vector push_back()----------" << endl;
    vector<int> v3(20, 100);
    v3.push_back(10);
    v3.push_back(11);
    test(v3);


    system("pause");
}

class Person {
public:
    char name[10];
    int age;
};

void main02() {

    Person p1, p2, p3;
    strcpy_s(p1.name, "张三");
    p1.age = 8;

    strcpy_s(p2.name, "李四");
    p2.age = 9;

    strcpy_s(p3.name, "王五");
    p3.age = 10;

    // vector容器装入Person类
    vector<Person> v1(10);
    v1[0] = p1;
    v1[1] = p2;
    v1[2] = p3;
    cout << v1[0].name << " " << v1[0].age << endl;

    system("pause");
}

void main() {

    Person p1, p2, p3;
    strcpy_s(p1.name, "张三");
    p1.age = 8;

    strcpy_s(p2.name, "李四");
    p2.age = 9;

    strcpy_s(p3.name, "王五");
    p3.age = 10;

    // vector容器装入指向Person类的指针
    vector<Person *> v1(10);
    v1[0] = &p1;
    v1[1] = &p2;
    v1[2] = &p3;
    
    for (int i = 0; i < v1.size(); i++) {
        Person* pTmp = v1[i];
        if (pTmp != NULL) {
            cout << "v1.size()=" << v1.size() << " " << v1[i]->name << " " << v1[i]->age << endl;

        }
    }

    system("pause");
}