Parse File Lines

File lines can be parsed with std::stringstream after reading them.

parse_file_lines.cpp

#include <cstdio>
#include <fstream>
#include <iostream>
#include <sstream>
#include <string>

int main() {
    int minimum = ;
    std::string filename = "scores.txt";

    std::ofstream setup(filename);
    setup << "Ada 91" << std::endl;
    setup << "Bjarne 74" << std::endl;
    setup << "Grace 88" << std::endl;
    setup.close();

    std::ifstream input(filename);
    std::string line;
    int passed = 0;

    while (std::getline(input, line)) {
        std::stringstream parser(line);
        std::string name;
        int score = 0;

        parser >> name >> score;
        if (score >= minimum) {
            ++passed;
        }
    }

    std::cout << "minimum=" << minimum << std::endl;
    std::cout << "passed=" << passed << std::endl;
    std::remove(filename.c_str());
    return 0;
}

#include <cstdio>
#include <fstream>
#include <iostream>
#include <sstream>
#include <string>

int main() {
    int minimum = ;
    std::string filename = "scores.txt";

    std::ofstream setup(filename);
    setup << "Ada 91" << std::endl;
    setup << "Bjarne 74" << std::endl;
    setup << "Grace 88" << std::endl;
    setup.close();

    std::ifstream input(filename);
    std::string line;
    int passed = 0;

    while (std::getline(input, line)) {
        std::stringstream parser(line);
        std::string name;
        int score = 0;

        parser >> name >> score;
        if (score >= minimum) {
            ++passed;
        }
    }

    std::cout << "minimum=" << minimum << std::endl;
    std::cout << "passed=" << passed << std::endl;
    std::remove(filename.c_str());
    return 0;
}

#include <cstdio>
#include <fstream>
#include <iostream>
#include <sstream>
#include <string>

int main() {
    int minimum = ;
    std::string filename = "scores.txt";

    std::ofstream setup(filename);
    setup << "Ada 91" << std::endl;
    setup << "Bjarne 74" << std::endl;
    setup << "Grace 88" << std::endl;
    setup.close();

    std::ifstream input(filename);
    std::string line;
    int passed = 0;

    while (std::getline(input, line)) {
        std::stringstream parser(line);
        std::string name;
        int score = 0;

        parser >> name >> score;
        if (score >= minimum) {
            ++passed;
        }
    }

    std::cout << "minimum=" << minimum << std::endl;
    std::cout << "passed=" << passed << std::endl;
    std::remove(filename.c_str());
    return 0;
}

line parsing Read a line from a file, then use a string stream to split the line into typed values.