将双空格替换为单空格 [英] replacing double space to single space

问题描述

如何使用C ++将双空格替换为单个空格

How can I replace the double space into single space using C++

例如:

"1  2  3  4  5" => "1 2 3 4 5"

这是我到目前为止所做的:

this is what I`ve done till now:

int _tmain(int argc, _TCHAR* argv[])
{
    string line;
    ifstream myfile(myFile);
    if(myfile.is_open())
    {
        cout<<"File Opened ...\n";
        while(myfile.good())
        {
            getline(myfile,line);
            splitLine(line);
            //cout<<line<<endl;
        }
    }
    else
        cout<<"File Not Found ...\n";
    myfile.close();
    return 0;
}

void splitLine(string line)
{
    int loc;
    cout<<line<<endl;
    while(loc = line.find(" "))
    {
        cout<<loc<<endl;
    }
}

推荐答案

在splitLines代码的while循环中，使用此代码.

In while loop of splitLines code, use this code.

  while((loc = line.find("  ")) != std::string::npos) //Two spaces here
  {
       line.replace(loc,2," "); //Single space in quotes
  }
  cout << line << endl;

就这样.我还没有尝试过，请告诉我它是否有效.

Thats it. I haven't tried it out, let me know if it works.

正如弗雷德指出的那样，在splitLines函数中使用按引用传递.上面的解决方案是次正规的，复杂度为O(n ^ 2).这个更好.

And as fred pointed out, use pass by reference in splitLines function. The above solution is sub-normal and is O(n^2) complexity. This one is better.

  int loc = -1;
  while((loc = line.find("  ",loc+1)) != std::string::npos) //Two spaces here
  {
       line.replace(loc,2," "); //Single space in quotes
  }
  cout << line << endl;

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