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c++用map,创建类似于python中的字典

news 2025/8/5 14:02:52

1.创建

#include <map>
#include <string>
#include <iostream>using namespace std;
int main() {/*using std::map;using std::string;using std::cout;*/map<string, string> myMap1 = {{"Name", "ClearLove"},{"Gender", "Male"},{"Position", "Jungle"},{"ID", "1"}};map<string, string> myMap2;myMap2["Name"] = "TheShy";myMap2["Gender"] = "Male";myMap2["Position"] = "Top";myMap2["ID"] = "2";map<string, string> myMap3(myMap2.begin(), myMap2.end());myMap3["ID"] = "3";map<string, string> myMap4(myMap3);myMap4["ID"] = "4";map<string, string> mapArr[4] = { myMap1, myMap2, myMap3, myMap4 };map<string, string>::iterator iter;//这种方法能够取出保存在map容器里面的数据for (int iMap = 0; iMap < 4; iMap++) {cout << "Map " << iMap + 1 << " of 4\n";for (iter = mapArr[iMap].begin(); iter != mapArr[iMap].end(); iter++) {cout << "key: " << iter->first << " , value: " << iter->second << ".\n";}}return 0;
}#include <map>
#include <string>
#include <iostream>using namespace std;
int main() {map<int, int> dict1;dict1[0] = 1;dict1[1] = 2;dict1[10] = 10;map<int, int>::iterator iter;iter = dict1.begin();while (iter != dict1.end()) {cout << iter->first << " : " << iter->second << endl;iter++;}//取出值的方法int a = dict1[0];cout << a << endl;cout << "usually:" << dict1.at(0) << endl;map< int,int >::iterator myIter = dict1.find(0);cout << myIter->first << "key<-:：->value" << myIter->second << endl;}

2.修改和增加

#include <map>
#include <string>
#include <iostream>
int main()
{map<int , string>dict1;for(int i = 0;i<=4;i++){dict1[i]="hello world";cout<<dict1[i]<<endl;}cout<<"++++++++++++++++++++"<<endl;//修改 string a;a = "12345678";dict1[0] =a;for(int i = 0;i<=4;i++){cout<<dict1[i]<<endl;}dict1[5]="12366";cout<<dict1[5]<<endl; //增加 cout<<"++++++++insert++++++++++++"<<endl;dict1.insert(pair<int,string>(9,"insert")) ;cout<<dict1[9]<<endl;//删除cout<<"+++++++++erase+++++++++++"<<endl;dict1.erase(2);for(int i = 0;i<=9;i++){cout<<dict1[i]<<endl;}}