分割字符串的程序不工作？ [英] Program that splits strings isn't working?

问题描述

我创建了一个程序，它将一个字符串拆分为更好的字符串，基于。
例如，我输入字符串

I've created a program that splits a string into, well, more strings, based around a . So, for instance, say I input the string

Workspace.SiteNet.Character.Humanoid

它是支持打印

Workspace
SiteNet
Character
Humanoid

但是，它会输出

Workspace
SiteNet.Character
Character.Humanoid
Humanoid

这是代码。

#include "stdafx.h"
#include <Windows.h>
#include <iostream>
#include <vector>
#include <sstream>
#include <WinInet.h>
#include <fstream>
#include <istream>
#include <iterator>
#include <algorithm>
#include <string>
#include <Psapi.h>
#include <tlhelp32.h>


int main() {
  std::string str;
  std::cin >> str;
  std::size_t pos = 0, tmp;
  std::vector<std::string> values;
  while ((tmp = str.find('.', pos)) != std::string::npos) {
    values.push_back(str.substr(pos, tmp));
    pos = tmp + 1;
  }
  values.push_back(str.substr(pos, tmp));

  for (pos = 0; pos < values.size(); ++pos){
    std::cout << "String part " << pos << " is " << values[pos] << std::endl;
  }
  Sleep(5000);
}

推荐答案

找到 s 中的最后一个点，将点后的所有内容的子串推入向量，然后使 s 在最后一个点之前。重复此操作，直到没有点，然后将 s 插入向量。

I think it would be easier to find the last dot in s, push the substring of everything after the dot into the vector, then make s everything before the last dot. Repeat this until there are no dots, then push s into the vector.

#include <iostream>
#include <string>
#include <vector>

std::vector<std::string> split_at_dot(std::string& s) {
  std::vector<std::string> matches;
  size_t pos;
  // while we can find the last dot
  while((pos = s.find_last_of(".")) != -1) {
    // push back everything after the dot
    matches.push_back(s.substr(pos+1));
    // update s to be everything before the dot
    s = s.substr(0, pos);
  }
  // there are no more dots - push back the rest of the string
  matches.push_back(s);
  // return the matches
  return matches;
}

int main() {
  std::string s = "Workspace.SiteNet.Character.Humanoid";
  std::vector<std::string> matches = split_at_dot(s);
  for(auto match: matches) {
    std::cout << match << std::endl;
  }
}

当我在输入上运行它时，

When I run it on your input, I get:

Humanoid
Character
SiteNet
Workspace

请注意，这将给您您预期的答案。如果你真的很重要，你可以使用 std :: stack 或者简单地反转 std :: vector 调用函数后。

Notice that this will give you your expected answers in reverse. If it's really important that you get them in that order you can use a std::stack or simply reverse the std::vector after calling the function.

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