Question

如何计算文本文件中的行数。我尝试使用以下代码，但输出始终为0。用户将输入他/她想要读入的.txt文件，然后程序将计算文件中的行数。

编辑：

   ifstream in (infile.c_str(), ios::in);
    if(!in.is_open())
    {
        cout << "Error - opening file: " << infile << endl;
        return;
    }

    while(!in.eof())
    {
        in >> type;
        if(in.fail()) break;
        //read corresponding object

        if(type == "Point2D,")
        {
            in >> p2d;
            //add to container
            points2d.push_back(p2d);
        }

        else if(type == "Point3D,")
        {
            in >> p3d;
            //add to container
            points3d.push_back(p3d);
        }

        else if(type == "Line2D,")
        {
            in >> line2d;
            //add to container
            lines2d.push_back(line2d);
        }

        else if(type == "Line3D,")
        {
            in >> line3d;
           //add to container
            lines3D.push_back(line3d);
        }
    }
 in.close();

while (getline(in, line))
    ++noOfRec;
    cout << noOfRec<<" records reading successfully!" << endl;
   //return 0;

Answer 1

 in.close();

您已经关闭了该文件。你应该再次打开它或者使用seekg（）

放回指向文件开头的指针

Answer 2

#include<iostream>
#include<fstream>
#include<string>
using namespace std;
int main() // <-------- HERE
{
   int c=0;
   string s;
   cin >> s; // include extension
   fstream input(s.c_str());
   while (getline(input, s))
     c++;
   cout << c << endl;
   return 0;
}

计算文本文件C ++中的行数

2 个答案: