ch-03-ex-02-solution.cpp
401c85835d5fmaster

ch-03-ex-02-solution.cpp
View Options

			/*
			* chapter-03-exercise-02.cpp
			*
			* Count number of rows in a file
			*
			* Created on: Sep 2, 2012
			* Author: Radu Popescu <radu.popescu@epfl.ch>
			*/

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

			int main(int argc, char *argv[]) {
			std::ifstream read_file("x_and_y.dat");
			if (!read_file.is_open()) {
			std::cout << "Error opening file." << std::endl;
			return 1;
			}

			int number_of_rows = 0;

			// This loop will read an empty line between the final EOL and the EOF
			// characters
			while (!read_file.eof()) {
			double dummy1, dummy2, dummy3, dummy4;
			read_file >> dummy1 >> dummy2 >> dummy3 >> dummy4;
			number_of_rows++;
			}
			std::cout << "Number of rows = " << number_of_rows << " (false)" << std::endl;

			// We try again
			number_of_rows = 0;
			read_file.clear();
			read_file.seekg(std::ios::beg);
			while (!read_file.eof()) {
			std::string line;
			getline(read_file, line);
			if (line.compare("") != 0) {
			number_of_rows++;
			}
			}
			std::cout << "Number of rows = " << number_of_rows << " (true)" << std::endl;

			read_file.close();

			return 0;
			}