STL之map学习实例

  1 ```
  2 #include<iostream>
  3 #include<algorithm>
  4 #include<vector>
  5 #include<map>
  6 #include<cstring>
  7 #include<cstdlib>
  8 #include<ctime>
  9 using namespace std;
 10 
 11 #define SALE_DEPATMENT 1//销售部门
 12 #define DEVELOP_DEPATMENT 2//研发部门
 13 #define FINACIAL_DEPATMENT 3//财务部门
 14 
 15 /*multimap案例
 16 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
 17 人员信息有：姓名 年龄 电话 工资等组成
 18 通过multimap 进行信息的插入 保存 显示
 19 分部门显示员工信息 显示全部员工信息*/
 20 
 21 class Worker{
 22 public:
 23     string mName;
 24     string mTele;
 25     int mAge;
 26     int mSalary;
 27 };
 28 
 29 void Creat_Worker(vector<Worker>& vWorker){
 30     string seedName="ABCDE";
 31     for( int i=0; i<5; i++ ){
 32         Worker worker;
 33         worker.mName="员工";
 34         worker.mName+=seedName[i];
 35 
 36         worker.mAge=rand()%10+20;
 37         worker.mTele="010-8888888";
 38         worker.mSalary=rand()%10000+10000;
 39         //保存员工信息
 40         vWorker.push_back(worker);
 41 
 42     }
 43 }
 44 
 45 //员工分组
 46 void WorkerByGroup(vector<Worker>& vWorker,multimap<int,Worker>& WorkerGroup){
 47     //把员工随机分配到不同的部门
 48     srand(time(NULL));
 49     for(vector<Worker>::iterator it=vWorker.begin(); it!=vWorker.end(); it++ ){
 50         int departID=rand()%3+1;
 51         switch(departID){
 52         case SALE_DEPATMENT:
 53             WorkerGroup.insert(make_pair(SALE_DEPATMENT,*it));
 54             break;
 55         case DEVELOP_DEPATMENT:
 56             WorkerGroup.insert(make_pair(DEVELOP_DEPATMENT,*it));
 57             break;
 58         case FINACIAL_DEPATMENT:
 59             WorkerGroup.insert(make_pair(FINACIAL_DEPATMENT,*it));
 60             break;
 61         default:
 62             break;
 63         }
 64     }
 65 
 66 }
 67 
 68 void ShowGroupWorkers(multimap<int,Worker>& WorkerGroup,int departID){
 69     multimap<int,Worker>::iterator it=WorkerGroup.find(departID);
 70     int DepartCount=WorkerGroup.count(departID);
 71     int num=0;
 72     for( ;num<DepartCount&&it!=WorkerGroup.end(); it++,num++ ){
 73         cout<<"姓名："<<it->second.mName<<" 年龄："<<it->second.mAge<<" 电话："
 74         <<it->second.mTele<<" 工资："<<it->second.mSalary<<endl;
 75     }
 76 }
 77 
 78 //打印每一部门的员工信息
 79 void PrintWorkerByGroup(multimap<int,Worker>& WorkerGroup){
 80     //打印销售部员工信息
 81     cout<<"销售部门"<<endl;
 82     ShowGroupWorkers(WorkerGroup,SALE_DEPATMENT);
 83     //打印研发部员工信息
 84     cout<<"研发部门"<<endl;
 85     ShowGroupWorkers(WorkerGroup,DEVELOP_DEPATMENT);
 86     //打印财务部员工信息
 87     cout<<"财务部门"<<endl;
 88     ShowGroupWorkers(WorkerGroup,FINACIAL_DEPATMENT);
 89 
 90 }
 91 
 92 
 93 int main(){
 94     //存放新员工的信息
 95     vector<Worker> vWorker;
 96     //multimap保存分组信息
 97     multimap<int,Worker> WorkerGroup;
 98     //创建员工
 99     Creat_Worker(vWorker);
100     //员工分组
101     WorkerByGroup(vWorker,WorkerGroup);
102     //打印每一部门的员工信息
103     PrintWorkerByGroup(WorkerGroup);
104 
105     return 0;
106 }
107 
108 ```