maxword.cpp

来自「C++&datastructure书籍源码,以前外教提供现在与大家共享」· C++ 代码 · 共 46 行

#include <iostream>
#include <string>
using namespace std;
#include "worditer.h"

#include "prompt.h"

// illustrates nested loops using WordStreamIterator class
// to find the word that occurs most often in a file
// Owen Astrachan, 2/13/96, 4/10/99

int main()
{
    int maxOccurs = 0;
    int wordCount = 0;
    string word,maxWord; 
    string filename = PromptString("enter file name: ");
    WordStreamIterator outer,inner;
    
    outer.Open(filename);         // open two iterators
    inner.Open(filename);
    
    for(outer.Init(); outer.HasMore(); outer.Next())
    {   wordCount++;
        word = outer.Current();       // current word for comparison
        int count = 0;                // count # occurrences
        
        for(inner.Init(); inner.HasMore(); inner.Next())
        {   if (inner.Current() == word)   // found another occurrence
            {   count++;
            }
        }
        if (count > maxOccurs)             // maximal so far
        {   maxOccurs = count;
            maxWord = word;
        }
        if (wordCount % 100 == 0)          // update "progress bar"
        {   cout << "..";
            if (wordCount % 1000 == 0) cout << endl;
        }
    }
    cout << endl << "word \"" << maxWord << "\" occurs " 
         << maxOccurs << " times" << endl;
    return 0;
}