ろれむいぷすむ (Hiragana generator)

#include <iostream>
#include <vector>
#include <string>
#include <fstream>
#include <iterator>
#include <algorithm>
#include <ctime>
#include <cstdlib>

#define MAX_NOUNS 3
#define NUM_SENTENCES 10

typedef std::vector<std::string> Vec;

void readFile(Vec &vec, const char* fileName){
    std::string str;
    std::ifstream file(fileName);
    if (file.is_open()){
        while (file.good()){
            getline(file, str);
            vec.push_back(str);
        }
        file.close();
    }else
        std::cout
            << "Error opening file: "
            << fileName
            << "."
            << std::endl;
}

int main(){
    srand(time(0));

    Vec nouns, verbs, particles;

    readFile(nouns, "nouns.txt");
    readFile(verbs, "verbs.txt");
    readFile(particles, "particles.txt");

    if (nouns.empty() || verbs.empty() || particles.empty())
        return 0;

    for (int i = 0; i != NUM_SENTENCES; ++i){

    int numNouns = rand() % MAX_NOUNS + 1;
    for (int i = 0; i != numNouns; ++i){
        std::cout
            << nouns[rand() % nouns.size()]
            << particles[rand() % particles.size()];
    }
    std::cout
        << verbs[rand() % verbs.size()]
        << "。"
        << std::endl;

    }
}