STL之map学习实例

 ```
 #include<iostream>
 #include<algorithm>
 #include<vector>
 #include<map>
 #include<cstring>
 #include<cstdlib>
 #include<ctime>
 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

 /*multimap案例
 公司今天招聘了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*/

 class Worker{
 public:
     string mName;
     string mTele;
     int mAge;
     int mSalary;
 };

 void Creat_Worker(vector<Worker>& vWorker){
     string seedName="ABCDE";
     for( int i=; i<; i++ ){
         Worker worker;
         worker.mName="员工";
         worker.mName+=seedName[i];

         worker.mAge=rand()%+;
         worker.mTele="010-8888888";
         worker.mSalary=rand()%+;
         //保存员工信息
         vWorker.push_back(worker);

     }
 }

 //员工分组
 void WorkerByGroup(vector<Worker>& vWorker,multimap<int,Worker>& WorkerGroup){
     //把员工随机分配到不同的部门
     srand(time(NULL));
     for(vector<Worker>::iterator it=vWorker.begin(); it!=vWorker.end(); it++ ){
         int departID=rand()%+;
         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:
             break;
         }
     }

 }

 void ShowGroupWorkers(multimap<int,Worker>& WorkerGroup,int departID){
     multimap<int,Worker>::iterator it=WorkerGroup.find(departID);
     int DepartCount=WorkerGroup.count(departID);
     int num=;
     for( ;num<DepartCount&&it!=WorkerGroup.end(); it++,num++ ){
         cout<<"姓名："<<it->second.mName<<" 年龄："<<it->second.mAge<<" 电话："
         <<it->second.mTele<<" 工资："<<it->second.mSalary<<endl;
     }
 }

 //打印每一部门的员工信息
 void PrintWorkerByGroup(multimap<int,Worker>& WorkerGroup){
     //打印销售部员工信息
     cout<<"销售部门"<<endl;
     ShowGroupWorkers(WorkerGroup,SALE_DEPATMENT);
     //打印研发部员工信息
     cout<<"研发部门"<<endl;
     ShowGroupWorkers(WorkerGroup,DEVELOP_DEPATMENT);
     //打印财务部员工信息
     cout<<"财务部门"<<endl;
     ShowGroupWorkers(WorkerGroup,FINACIAL_DEPATMENT);

 }

 int main(){
     //存放新员工的信息
     vector<Worker> vWorker;
     //multimap保存分组信息
     multimap<int,Worker> WorkerGroup;
     //创建员工
     Creat_Worker(vWorker);
     //员工分组
     WorkerByGroup(vWorker,WorkerGroup);
     //打印每一部门的员工信息
     PrintWorkerByGroup(WorkerGroup);

     return ;
 }

 ```