Question

此程序将文件从主目录拆分为两个文件，然后使用新名称拼接原始文件。

如何添加计数器以输出新文件中有多少行？

示例：此文件中有80行（放在新文件的末尾）

我该怎么办？

#include<iostream>
#include<fstream>
using namespace std;

void pause();

int main()
{
    char filename[] = "Lab2Test.txt";
    char filenameA[] = "LabTest-FA.txt";
    char filenameB[] = "LabTest-FB.txt";
    char filenew[] = "Lab2Test-NEW.txt";

    ifstream origin(filename);
    ofstream fA(filenameA);
    ofstream fB(filenameB);
    ofstream fnew(filenew);

    if (! origin)
    {
       cout << filename << " could not be opened." << endl;
       return -1;
    }

    string s;
    int i=0;
    while(getline(origin, s))
    {
        if(i % 2 == 1) //odd - write to LabTest-FA
            fA << s << endl;
        else
            fB << s << endl;
        i++;
    }

    fA.close();
    fB.close();

    ifstream fAA(filenameA);
    ifstream fBB(filenameB);

    string s1, s2;
    while(getline(fBB,s1))
    {
        fnew << "A. " << s1 << endl;
        if(getline(fAA,s2))
            fnew << "B. " << s2 << endl;
    }
}

void pause()
{
    cin.sync();
    cout << "Press any key to continue..." << endl;
    cin.ignore();
}

Answer 1

int counter = 0;
counter++;

每当您写信至fnew时

。

Answer 2

int countA, countB;
if(i % 2 == 1) //odd - write to LabTest-FA
{
    fA << s << endl;
    countA++;
}
else
{
    fB << s << endl;
    countB++;
}
i++;
fA << "There are" + countA + "lines in this file"  << endl;
fB << "There are" + countB + "lines in this file"  << endl;

fA.close();
fB.close();

如果字符串连接不起作用，我很抱歉，用C / C ++已经有一段时间了。

计算文本文件中的行

2 个答案: