map_ints.cpp

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本文通过一个具体的C++程序示例介绍了如何使用STL中的map容器来存储整数到字符串的映射，并演示了如何读取用户输入的数字并将其转换为对应的英文单词。

name="google_ads_frame" marginwidth="0" marginheight="0" src="http://pagead2.googlesyndication.com/pagead/ads?client=ca-pub-5572165936844014&dt=1194442938015&lmt=1194190197&format=336x280_as&output=html&correlator=1194442937843&url=file%3A%2F%2F%2FC%3A%2FDocuments%2520and%2520Settings%2Flhh1%2F%E6%A1%8C%E9%9D%A2%2FCLanguage.htm&color_bg=FFFFFF&color_text=000000&color_link=000000&color_url=FFFFFF&color_border=FFFFFF&ad_type=text&ga_vid=583001034.1194442938&ga_sid=1194442938&ga_hid=1942779085&flash=9&u_h=768&u_w=1024&u_ah=740&u_aw=1024&u_cd=32&u_tz=480&u_java=true" frameborder="0" width="336" scrolling="no" height="280" allowtransparency="allowtransparency"> #ifdef __BCPLUSPLUS__
#include <map.h>
#else
#include <map>
#endif

#include <iostream.h>
#include <string.h>

using namespace std;
typedef map<int, string, less<int>> INT2STRING;

void main(void)
{
   // Create a map of ints to strings
   INT2STRING theMap;
   INT2STRING::iterator theIterator;
   string theString = "";
   int index, continue = 1;

   // Fill theMap with the digits 0 - 9, each mapped to its string counterpart
   // Note: value_type is a pair for maps...
   theMap.insert(INT2STRING::value_type(0,"Zero"));
   theMap.insert(INT2STRING::value_type(1,"One"));
   theMap.insert(INT2STRING::value_type(2,"Two"));
   theMap.insert(INT2STRING::value_type(3,"Three"));
   theMap.insert(INT2STRING::value_type(4,"Four"));
   theMap.insert(INT2STRING::value_type(5,"Five"));
   theMap.insert(INT2STRING::value_type(6,"Six"));
   theMap.insert(INT2STRING::value_type(7,"Seven"));
   theMap.insert(INT2STRING::value_type(8,"Eight"));
   theMap.insert(INT2STRING::value_type(9,"Nine"));
   // Read a Number from the user and print it back as words
   while (continue)
     {
       cout << "Enter /"q/" to quit, or enter a Number: ";
       cin >> theString;
       if(theString == "q")
         continue = 0;
       // extract each digit from the string, find its corresponding
       // entry in the map (the word equivalent) and print it
       for( index = 0; index < theString.length(); index++)
        {
          theIterator = theMap.find(theString[index] - '0');
          if(theIterator != theMap.end())   // is 0 - 9
            cout << (*theIterator).second << " ";
          else          // not 0 - 9
            cout << "[err] ";
        }
       cout << endl;
    }
}