每 X 行读取并写入文件

发布于 2025-01-01 23:41:48 字数 477 浏览 1 评论 0原文

#include <iostream>
#include <fstream>

using namespace std;

int main()
{
    ifstream  stream1("source.txt");
    string line ;
    ofstream stream2("target.txt");

        while( std::getline( stream1, line ) )
        {
            stream2 << line << endl;
            cout << line << endl;
        }


    stream1.close();
    stream2.close();    return 0;
}

我想让这个程序每 10 行读取一次并将其写入我的文件中。

我该怎么做呢？

原文

#include <iostream>
#include <fstream>

using namespace std;

int main()
{
    ifstream  stream1("source.txt");
    string line ;
    ofstream stream2("target.txt");

        while( std::getline( stream1, line ) )
        {
            stream2 << line << endl;
            cout << line << endl;
        }


    stream1.close();
    stream2.close();    return 0;
}

I want to make this program read every 10th line and write it into my file.

How do i go about doing this?

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秋凉 2025-01-08 23:41:48

您需要读取每一行并增加一个计数器。如果计数器达到 10，则需要写入该行并重置计数器。

int lineNumber = 0;

while( std::getline( stream1, line ) )
{
    if (lineNumber == 10)
    {
         stream2 << line << endl;
         cout << line << endl;
         lineNumber = 0
    }

    lineNumber++;
}

You need to read every line and increment a counter. If the counter reach 10, you need to write the line and reset the counter.

int lineNumber = 0;

while( std::getline( stream1, line ) )
{
    if (lineNumber == 10)
    {
         stream2 << line << endl;
         cout << line << endl;
         lineNumber = 0
    }

    lineNumber++;
}

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