C++ //统计元素个数 //统计内置数据类型 //统计自定义数据类型

//统计元素个数

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

//统计内置数据类型
void test01()
{
    vector<int>v;

    v.push_back(10);
    v.push_back(50);
    v.push_back(90);
    v.push_back(30);
    v.push_back(30);
    v.push_back(20);
    v.push_back(30);


    int num=count(v.begin(), v.end(), 30);
    cout << "30的元素个数为: " << num << endl;

}

//统计自定义数据类型
class Person
{
public:
    Person(string name, int age)
    {
        this->m_Name = name;
        this->m_Age = age;
    }

    bool operator==(const Person &p)
    {
        if (this->m_Age == p.m_Age)
        {
            return true;
        }
        else
        {
            return false;
        }
    }

    string m_Name;
    int m_Age;
};
void test02()
{
    vector <Person>v;
    Person p1("张三", 30);
    Person p2("李四", 40);
    Person p3("王五", 30);
    Person p4("赵六", 30);
    Person p5("孙七", 70);

    v.push_back(p1);
    v.push_back(p2);
    v.push_back(p3);
    v.push_back(p4);
    v.push_back(p5);


    Person p("齐吧", 30);
    int num = count(v.begin(), v.end(), p);
    cout << "和诸葛亮岁数一样的人为：" << num << endl;
}

int main()
{

    test01();
    test02();

    system("pause");
    return 0;
}