1

您好，我是stackoverflow的新手，所以请原谅我犯的任何新手错误。我有一个正在尝试用 C++ 构建的程序，但遇到了一些问题。该程序应该让用户输入文件名，然后读取文件并计算文本文件中的字数并打印最后十个和前十个。一旦我在文本文件上为间距或包含大量单词的文本文件点击任何返回，我的程序似乎无法正常工作。任何人都可以帮助引导我走向正确的方向。

谢谢！！

#include <iostream>
#include <cmath>
#include <cstdlib>
#include <fstream>
#include <string>
#include <iomanip>
#include <stdio.h>
#include <sstream>
#include <algorithm>


using namespace std;

string  *tokenizedWords = new string[5000000]; //array to hold tokenized words
string *tokenizedReversed = new string[5000000]; //array to hold tokenized words reverse

int tokenize(string linesFromFile, string tokenizedWords[]);

int main()
{
    string linesFromFile; //holds the line read from a file
    int wordCount = 0; //int to keep wordcount in the while loop
    int firstLast = 10; //the amount for first ten and last ten words to print
    string theNameofTheFile; //to hold the filename

    cout << "Please enter a filename: " << endl; //asks the user
    cin >> theNameofTheFile;

    ifstream inputStream(theNameofTheFile.c_str());

    if(inputStream.is_open()) //check if the file opened correctly
    {
        while(std::getline(inputStream, linesFromFile)) //reads all of the lines
        {
            wordCount++;

            if(linesFromFile.length() > 0) //checks if the line is empty
            {

                wordCount = tokenize(linesFromFile,tokenizedWords);

                if(wordCount < firstLast) //if text file has less than ten words
                    {
                        cout << "This text file is smaller than 10 words so I can not print first and last 10 words." << endl;
                        return 0;
                    }

                if(wordCount > firstLast) //if textfile has more than ten words
                {

                    cout << endl;
                    cout << "The first ten words of the document are:" << endl;
                    cout << endl;

                    for(int j = 0; j < firstLast; j++)
                    {
                        cout << tokenizedWords[j] << endl;
                    }

                    cout << endl;
                    cout << "The last ten words of the document are:" <<  endl;
                    cout << endl;

                    std::reverse_copy(tokenizedWords, tokenizedWords+wordCount, tokenizedReversed);

                    for(int i = 0; i < firstLast; i++)
                    {
                        cout << tokenizedReversed[i] << endl;
                    }

                }
            }

            inputStream.close(); //close the file

            cout<< "Total amount of words is: " << wordCount << endl;
        }


    }

    else
    {
        //if wrong file is inputed
        cout << "Sorry the file " << theNameofTheFile << " does not exists " << endl;
    }

    return 0;
}

int tokenize(string linesFromFile, string tokenizedWords[])
{
    int totalWords (0);

   istringstream toTokenize(linesFromFile);
   while (toTokenize.good())
   {
      toTokenize >> tokenizedWords[totalWords++];
   }

    return (totalWords);
}
4

0 回答 0