map

代码示例

#include<iostream>
#include<map>
using namespace std;
int main(){//创建并初始化mapmap<int,string> myMap={{1,"Apple"},{2,"Banana"},{3,"Orange"}} ;//插入元素myMap.insert(make_pair(4,"Grapes")) ;//查找和访问元素cout<<"Value at key 2:"<<myMap[2]<<endl;//遍历打印map中的元素for(const auto& pair:myMap){cout<<"key:"<<pair.first<<",value:"<<pair.second<<endl;} //删除元素myMap.erase(3);//判断元素是否存在if(myMap.count(3)==0) {cout<<"key 3 not found"<<endl;}//清空mapmyMap.clear();//判断map是否为空if(myMap.empty()){cout<<"map is empty"<<endl; } return 0;
}