C++ Data files

how can i open a file from a program and count the lines in the files and return the total amount of lines in the file to the program?

Maybe not the most efficient method, but probably the easiest for text files

Code:

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#include <fstream>
#include <iostream>
#include <string>




int main(){

        std::ifstream in;
       
        std::string filename;
       
        std::cout << "Enter name of file" << std::endl;
       
        std::getline(std::cin,filename);//get name of file
       
        in.open(filename.c_str());//open it
       
        if(!in.is_open()){//see if open was successful
                std::cout << "Could not open " << filename;
                return 1;
        }
       
        std::string dummy;//dummy string to hold read info
        int n = 0;//line count
       
        dummy.reserve(500);//try reserve memory (not needed, but may help)
       
        while(!in.eof()){//while not at end of file
                std::getline(in,dummy);//read a line into a string
                ++n;//increase count       
        }
               
        std::cout << "Total line count = " << n;

}

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I think you have to count how many times the '\n' appeared in the text file.