第十五周项目 补充阅读程序（4）

/* *Copyright(c) 2016, 烟台大学计算机与控制工程学院 *All rights reserved. *文件名称:main.cpp *作    者：李德坤 *完成日期：2016年6月7日 *版本号：v1.0 * *问题描述：补充阅读（4） *输入描述：无 *输出描述：无 */#include <algorithm>#include<map>#include<iterator>#include<iostream>#include<cstring>using namespace std;struct ltstr{    bool operator()(const char* s1, const char* s2) const    {        return strcmp(s1, s2) < 0;    }};int main(){    map<const char*, int, ltstr> months;    months["january"] = 31;    months["february"] = 28;    months["march"] = 31;    months["april"] = 30;    months["may"] = 31;    months["june"] = 30;    months["july"] = 31;    months["august"] = 31;    months["september"] = 30;    months["october"] = 31;    months["november"] = 30;    months["december"] = 31;    cout << "june -> " << months["june"] << endl;    map<const char*, int, ltstr>::iterator cur  = months.find("june");    map<const char*, int, ltstr>::iterator prev = cur;    map<const char*, int, ltstr>::iterator next = cur;    ++next;    --prev;    cout << "Previous (in alphabetical order) is " << (*prev).first << endl;    cout << "Next (in alphabetical order) is " << (*next).first << endl;    return 0;}