C++ STL Map使用

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第一种：用insert函数插入pair数据

#include <map>#include <string>#include <iostream>using namespace std;int main(){map<int,string> mapStudent; mapStudent.insert(pair<int, string>(1,"student_one"));  mapStudent.insert(pair<int, string>(2,"student_two"));   mapStudent.insert(pair<int, string>(3,"student_three"));    map<int, string>::iterator iter;    for(iter=mapStudent.begin();iter!= mapStudent.end();iter++){    cout<<iter->first<<" "<<iter->second<<endl;}return 0;}

第二种：用insert函数插入value_type数据

#include <map>#include <string>#include <iostream>using namespace std;int main(){map<int,string> mapStudent; mapStudent.insert(map<int, string>::value_type (1,"student_one"));    mapStudent.insert(map<int, string>::value_type (2,"student_two"));    mapStudent.insert(map<int, string>::value_type (3,"student_three"));    map<int, string>::iterator iter;    for(iter=mapStudent.begin();iter!= mapStudent.end();iter++){    cout<<iter->first<<" "<<iter->second<<endl;}return 0;}

第三种：用数组方式插入数据

#include <map>#include <string>#include <iostream>using namespace std;int main(){map<int,string> mapStudent; mapStudent[1]="student_one";  mapStudent[2]="student_two";    mapStudent[3]="student_three";    map<int, string>::iterator iter;    for(iter=mapStudent.begin();iter!= mapStudent.end();iter++){    cout<<iter->first<<" "<<iter->second<<endl;}return 0;}

真正有用的是下面的根据关键字查找（字符串类型）其他信息

#include <map>#include <string>#include <iostream>using namespace std;int main(){map<string,string>mapStudent; /* mapStudent.insert(map<string, string>::value_type ("zhangsan","student_one"));    mapStudent.insert(map<string, string>::value_type ("lisi","student_two"));    mapStudent.insert(map<string, string>::value_type ("wangwu","student_three"));*/mapStudent["zhangsan"]="bad boy";mapStudent["lisi"]="good boy";mapStudent["wangwu"]="good girl";    map<string,string>::iterator iter;    iter=mapStudent.find("lisi");    if(iter!=mapStudent.end()) cout<<iter->first<<":"<<iter->second<<endl;    iter=mapStudent.find("tianqi");    if(iter==mapStudent.end()) cout<<"There is no such a man"<<endl;return 0;}