standard library file i/o

slf.cpp

#include <iostream> /// std::cout; std::endl;
#include <fstream> /// std::ifstream; std::ofstream;
#include <vector> /// std::vector;

int main ()
{
    std::vector <std::string> vec_data; /// declares and define vector name vec_data that stores strings
    std::string temp_store; /// declares and define temp_store to store a temporary data 

    std::ifstream read("data.txt"); /// declares and define read that opens the file name data.txt

    if (!read) { /// if the stream is in error state or failbit then execute this code 
        std::cout << "failed to open the file " << std::endl;
        goto EXIT; /// jumps to statement EXIT:
    }

    while (std::getline(read, temp_store)) { /// reads the file and stores to temp_store ends until the end of file (eofbit)
        vec_data.push_back (temp_store); /// stores each data in a vector vec_data
    }

    for (auto vd : vec_data) /// displays the data stored in a vector vec_data
        std::cout << vd << std::endl;
    
    EXIT:
    return 0;
}