C++ 字符串、标点符号、数组

Question

我需要能够仅使用 C++ 字符串才能更改下面的输入段落。我遇到的问题是，当我在末尾拉出带有标点符号的东西时，例如“programs-”，它会将它作为“programs-”拉入我的数组，而不是分别将“programs”和“-”拉入我的数组。我需要知道如何执行此操作，以便我可以将所有“-”替换为“.”。

如何将两者分开并将它们分别放在数组中它自己的 block 中？

#include <iostream>
#include <fstream>

using namespace std;


void read(string line[], string para[], int &d)
{
string temp;
int i = 0;

ifstream myfile ("paragraphwordsub.txt");
if (myfile.is_open())
{
    while ( temp != "$" )
    {
        myfile >> temp;
        line [i] = temp;
        cout << line[i] << " ";
        i++;
    }
    cout << endl;
    i=0;
    while (!myfile.eof())
    {
        myfile >> temp;
        para[i] = temp;
        cout << para[i] << " ";
        d++;
        i++;
    }

 myfile.close();
}

else cout << "Unable to open file";

cout << endl << endl << i << endl << para[73] << endl;

return;

}

int main()
{
  int const SIZE = 100;
  string a [SIZE];
  string b [SIZE];
  int counter = 0;

  read(a, b, counter);

  cout << endl << endl << counter << endl;


  return 0;

}

输入:

Whose programs is such? There were important programs to be done and Tommy were asked to do such- Tommy were sure Sam would do such- Samson could have done such, but Nicholsonnders did such- Sam got angry about that, because such were Tommy's programs- Tommy thought Samson could do such but Nicholsonnders realized that Tommy wouldn't do such- It ended up that Tommy blamed Sam when Nicholsonnders did what Samson could have done-

Answer 1

如果我对问题的理解正确，你想在你的输入中找到子字符串“-”的每一次出现并将其替换为子字符串“.”。

您可能一直希望因为 operator>> 从输入中一次读取一个“单词”，所以它会在“programs”的最后一个字母之后停止；但实际上它仅在涉及到空白或输入结束时才停止。似乎希望有一个流操纵器，您可以使用它来告诉它在标点符号处停止，但我不知道有任何这样的操纵器。

你可以尝试这样的事情:

myfile >> temp;
size_t position = temp.find("-");
while (found!=std::string::npos) {
  temp.replace(position, 1, ".");
}

如果你使用字符串变量而不是文字“-”和“.”，你可以概括它来进行任何你想要的替换(但是代替常量 1 在 replace() 的参数中，你必须使用要替换的子串的长度)。