处理从一个文本文件到另一个文本文件的行 [英] Processing lines from one text file to another

问题描述

我要感谢所有帮助我解决问题的人.终于可以按出生年份排列数据了！非常感谢.如果有人能帮我解决最后一个问题，那就太好了

I would like to give thanks to everyone who helped me with my problem. I was finally able to arrange the data by birth year! Very much appreciated. If anyone can help me with this final question, that'd be great

如果我的文本文件中有如下所示的行:

If I have lines in a text file that look like this:

1    4:48:08   Orvar Steingrimsson                 1979   30 - 39 ara      IS200 
2    4:52:25   Gudni Pall Palsson                  1987   18 - 29 ara      IS870 

我如何将这些数据输出到一个新的文本文件中，但只列出三件事:年份 - 名称 - 时间......以便这两行看起来像这样:

How can I output this data onto a new text file but only listing three things: year - name - time ... so that these two lines would look like this:

1979   Orvar Steingrimsson   4:48:08
1987   Gudni Pall Palsson    4:52:25

我的猜测是这样的:

ifstream in("inputfile.txt");
ofstream out("outputfile.txt");
int score, year;
string name, time, group, team;
while (getline(in,str));
in >> score >> time >> name >> year >> group >> team;
//and then do something like this
out << year << name << time << '
';

但是我有一种感觉，我将无法在整个文本文件和所有 200 行中循环播放.任何提示表示赞赏！谢谢

However I have a feeling I won't be able to loop this through the whole text file and all 200 lines. Any tips appreciated! Thanks

推荐答案

我知道年份总是每行的第 54 到 58 个字符"

所以，考虑一下:

int main ()
{
    ifstream  in("laugavegurinn.txt", ios::in);
    ofstream out("laugavegurinn2.txt");
    string str;
    multimap<int, string> datayear;

    while (getline(in,str)) {
         int year = stoi(str.substr(54, 4));
         datayear.insert(make_pair(year,str)); //use insert function
         // multimap don't have [] operator
           }

    for (auto v : datayear) 
        out << v.second << "
";

    in.close();
    out.close();
}

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