1

我创建了一个程序，该程序将逐行读取文本文件，并将每行中的各个单词分开（以空格分隔）。现在我希望能够编辑代码，以便第一行的所有标记都为 1，第二行的所有标记都为 2，如果有人可以帮助我，请在下面是我的代码：

#include <iostream>
using std::cout;
using std::endl;

#include <fstream>
using std::ifstream;
#include <cmath>
#include <string>

const int MAX_CHARS_PER_LINE = 512;
const int MAX_TOKENS_PER_LINE = 20;
const char* const DELIMITER = " ";
using namespace std;
int main()
{
    string filename;
  // create a file-reading object
 /*std::ifstream file1("file1.txt", ios_base::app);
std::ifstream file2("file2.txt");

std::ofstream combinedfile("combinedfile.txt");
combinedfile << file1.rdbuf() << file2.rdbuf();*/

  ifstream fin;
  //enter in file name combinedfile.txt
  cout <<"please enter file name (including .txt)";
  cin >> filename ;
  fin.open(filename); // open a file
  if (!fin.good()) 
    return 1; // exit if file not found

  // read each line of the file
  while (!fin.eof())
  {
    // read an entire line into memory
    char buf[MAX_CHARS_PER_LINE];
    fin.getline(buf, MAX_CHARS_PER_LINE);

    // parse the line into blank-delimited tokens
    int n = 0; // a for-loop index

    // array to store memory addresses of the tokens in buf
    const char* token[MAX_TOKENS_PER_LINE] = {}; // initialize to 0

    // parse the line
    token[0] = strtok(buf, DELIMITER); // first token
    if (token[0]) // zero if line is blank
    {
      for (n = 1; n < MAX_TOKENS_PER_LINE; n++)
      {
        token[n] = strtok(0, DELIMITER); // subsequent tokens
        if (!token[n]) break; // no more tokens
      }
    }

    // process (print) the tokens
    for (int i = 0; i < n; i++) // n = #of tokens
      cout << "Token[" << i << "] = " << token[i] << endl;
    cout << endl;
  }
  system("pause");
  return 0;
}

所以输出应该是这样的：

Token[1] = This
Token[1] = course
Token[1] = provides
Token[1] = detailed
Token[1] = coverage
Token[1] = of
Token[1] = the
Token[1] = concepts
Token[1] = and
Token[1] = syntax

Token[2] = Coverage
Token[2] = includes
Token[2] = inheritance,
Token[2] = overloaded
Token[2] = operators,
Token[2] = overloaded
Token[2]= default
Token[2] = operators,
4

2 回答 2

2

If you just want to separate words into two containers such that the first contains words from the first line, and the second contains words from the second line, you can use vectors to store them and string streams to extract words from a line of text:

#include <sstream>
#include <string>
#include<vector>
#include<fstream>
using namespace std;

int main()
{
    ifstream infile("test.txt");
    string line;
    string word;
    vector< vector<string> >  tokens(2);
    for (int ix = 0; ix < 2; ++ix)
    {    
        getline(infile, line);
        istringstream iss(line);
        while(iss >> word)
            tokens[ix].push_back(word);
    }   
}

Here, tokens[0] is a vector containing words from the first line, and tokens[1] contains words from the second line.

于 2013-08-16T10:47:13.057 回答
0

您可以将向量的向量创建为

vector<vector<string>> VEC;

并继续VEC[0]为第一行添加单词，然后在遇到要指向的换行符时递增计数器VEC[1]，依此类推。

于 2013-08-16T10:39:54.110 回答