Read a file and count its lines and words

Description: Write poem.txt with three lines, then read it and print the number of lines and words.

Hint:

• std::getline reads a line, and an istringstream counts the words of the line.

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Solution

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

int main() {
    std::ofstream("poem.txt") << "Roses are red\nViolets are blue\nC++ is fun\n";

    std::ifstream in("poem.txt");
    std::string line;
    int lines = 0, words = 0;
    while (std::getline(in, line)) {
        lines++;
        std::istringstream ls(line);
        std::string w;
        while (ls >> w) words++;
    }
    std::cout << "Lines: " << lines << '\n' << "Words: " << words << '\n';
}

How it works

• The first stream is closed at the end of the line (RAII), so the file is complete before we read it.

Read C++ File Handling.

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