16-02-06.cpp

more efftive 代码

#include <iostream>
#include <hash_map>
#include <cstring>
using namespace std;

struct eqstr
{
  bool operator()(const char* s1, const char* s2) const
  {
    return strcmp(s1, s2) == 0;
  }
};

int main()
{
  hash_map<const char*, int, hash<const char*>, eqstr> days;
  
  days["january"] = 31;
  days["february"] = 28;
  days["march"] = 31;
  days["april"] = 30;
  days["may"] = 31;
  days["june"] = 30;
  days["july"] = 31;
  days["august"] = 31;
  days["september"] = 30;
  days["october"] = 31;
  days["november"] = 30;
  days["december"] = 31;
  
  cout << "september -> " << days["september"] << endl;
  cout << "april     -> " << days["april"] << endl;
  cout << "june      -> " << days["june"] << endl;
  cout << "november  -> " << days["november"] << endl;
}