对组
#include<iostream>
using namespace std;
void test01() {
//构造方法
pair<int, int>pair1(10, 20);
cout << pair1.first << " " << pair1.second << endl;//10 20
pair<int, string>pair2 = make_pair(10, "aaa");
cout << pair2.first << " " << pair2.second << endl;//10 aaa
pair<int, string>pair3;
pair3 = pair2;
cout << pair3.first << " " << pair3.second << endl; //10 aaa
}
int main() {
test01();
return 0;
}
希望在做案例之前,把以上程序运行以下理解以下pair函数具体意思和使用方式及场景。
案例:
今天公司招聘了5个员工,5名员工进入公司之后,需要指派员工在那个部门工作
人员信息有:姓名 年龄 电话 工资等组成
通过Multimap进行信息的插入 保存 显示
分部门显示员工信息,显示全部员工信息
编程
#include<iostream>
#include<map>
#include<string>
#include<vector>
#include<stdlib.h>
#include<time.h>
using namespace std;
#define SALE_DEPATMENT 1//销售部门
#define DEVELOP_DEPATMENT 2//研发部门
#define FINACIAL_DEPATMENT 3//财务部门
#define ALL_DEPATMENT 4//所有部门
class worker {
public:
worker() {};
worker(string name,int age,string num,int salary):mName(name),mAge(age),mNum(num), mSalary(salary){}
public:
string mName;
int mAge;
string mNum;
int mSalary;
};
void Create_worker(vector<worker>& vworker) {
string name = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
for (int i = 0; i < 50; ++i) {
worker p;
p.mName = "员工";
p.mName += name[i];
p.mAge = rand() % 10 + 20;
/*如果要产生0-99这100个整数中的一个随机整数,可以用int num=rand()%100
如果要产生1-100这100个整数中一个随机整数,可以用int num=rand%100+1*/
p.mNum = "8888888888";
p.mSalary = rand() % 10000 + 10000;
//保存员工信息
vworker.push_back(p);
}
}
void WorkerByGroup(vector<worker>& vworker, multimap<int, worker>& workerGroup) {
srand(time(NULL));//加个这个可以使下面部门分类随机化,不然每次输出结果都一样
//把员工随机分配不同部门
for (vector<worker>::iterator it = vworker.begin(); it != vworker.end(); ++it) {
int departID = rand() % 3 + 1;
switch (departID) {
case SALE_DEPATMENT:
workerGroup.insert(make_pair(SALE_DEPATMENT, *it));
break;
case DEVELOP_DEPATMENT:
workerGroup.insert(make_pair(DEVELOP_DEPATMENT, *it));
break;
case FINACIAL_DEPATMENT:
workerGroup.insert(make_pair(FINACIAL_DEPATMENT, *it));
break;
default:
workerGroup.insert(make_pair(ALL_DEPATMENT, *it));
break;
}
}
}
void ShowGroupWorker(multimap<int, worker>& workerGroup, int departID) {
//打印员工信息
multimap<int, worker>::iterator it = workerGroup.find(departID);
//找当前部门总人数
int DepartCount = workerGroup.count(departID);
int num = 0;
for (multimap<int, worker>::iterator pos = it; pos != workerGroup.end() && num < DepartCount; ++pos, ++num) {
cout << "姓名:" << (*pos).second.mName << " 年龄:" << (*pos).second.mAge << " 电话:" << (*pos).second.mNum << " 工资:" << (*pos).second.mSalary << endl;
}
}
void PrintWorkerByGroup(multimap<int, worker>& workerGroup) {
cout << "销售部门" << endl;
ShowGroupWorker(workerGroup, SALE_DEPATMENT);
cout << "研发部门" << endl;
ShowGroupWorker(workerGroup, DEVELOP_DEPATMENT);
cout << "财务部门" << endl;
ShowGroupWorker(workerGroup, FINACIAL_DEPATMENT);
cout << "所有部门" << endl;
ShowGroupWorker(workerGroup, ALL_DEPATMENT);
}
int main(void) {
//存放新员工信息
vector<worker>vworker;
//multimap保存分组信息
multimap<int, worker>workerGroup;
//创建员工
Create_worker(vworker);
//员工分组
WorkerByGroup(vworker, workerGroup);
//打印每一部分员工信息
PrintWorkerByGroup(workerGroup);
}