在最近一直在閱讀xx項目，看到里面用到了map，讀大學期間基本上從來沒用到過這種stl（大學就用了Vector和list）。下面對map敲如下代碼：

運行截圖如下：

代碼如下：

#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;}cout << endl;//mapStudent.clear();mapStudent.insert(map<int, string>::value_type(4, "student_four"));mapStudent.insert(map<int, string>::value_type(5, "student_five"));mapStudent.insert(map<int, string>::value_type(6, "student_six"));for (iter = mapStudent.begin(); iter != mapStudent.end(); iter++)cout << iter->first << " " << iter->second << endl;cout << endl;//mapStudent.clear();mapStudent[7] = "student_seven";mapStudent[8] = "student_eight";mapStudent[9] = "student_nine";for (iter = mapStudent.begin(); iter != mapStudent.end(); iter++)cout << iter->first << " " << iter->second << endl;cout << endl;pair<map<int, string>::iterator, bool>insert_pair;insert_pair = mapStudent.insert(map<int, string>::value_type(1, "student_one"));if (insert_pair.second == true)cout << "插入<1,student_one>成功！\n";elsecout << "插入<1,student_one>失敗！\n";insert_pair = mapStudent.insert(map<int, string>::value_type(10, "student_ten"));if (insert_pair.second == true){cout << "插入<10,student_ten>成功！\n開始遍歷！\n";for (iter = mapStudent.begin(); iter != mapStudent.end(); iter++)cout << iter->first << " " << iter->second << "\n";cout << endl;}elsecout << "插入<10,student_ten>失敗！\n";//打印大小cout << "mapStudent的大小為：" << mapStudent.size() << endl << endl;//用數組方式遍歷for (int i = 1; i <= mapStudent.size(); i++) //此處從1開始，非0開始cout << mapStudent[i] << endl;cout << endl;//查找map<int, string>::iterator iter_find;iter_find = mapStudent.find(5);if (iter_find != mapStudent.end())cout << "Find, the value is " << iter_find->second << endl;cout << endl;//刪除和清空和Vector類似getchar();return 0; }

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