Программа-просмотрщик ascii - артов

 #include <iostream>
#include <vector>
#include <string>
#include <conio.h>
 
using namespace std;
 
ifstream* openFile(const string& fileName) {
    ifstream* ifs = new ifstream(fileName);
    return ifs;
}
 
void closeFile(ifstream* ifs) {
    ifs -> close();
    delete ifs;
}
 
std::vector<std::string>* readFile(const std::string& fileName) {
    std::ifstream* ifs = openFile(fileName);
    std::vector<std::string>* lines = new std::vector<std::string>;
    std::string line;
    while (getline(*ifs, line)) {
        lines->push_back(line);
    }
    closeFile(ifs);
    return lines;
}
 
int main() {
    string fileName;
    vector<string>* lines = nullptr;
    while (true) {
        cout << "Enter file name: ";
        cin >> fileName;
            if (lines != nullptr) {
                delete lines;
                lines = nullptr;
            }
            lines = readFile(fileName);
            for (const auto& line : *lines) {
                cout << line << endl;
            }
    }
    return 0;
}

#include <iostream>
#include <fstream>
#include <vector>
#include <string>
 
using namespace std;
 
ifstream* openFile(string filename) {
    ifstream* file = new ifstream(filename);
    return file;
}
 
void closeFile(ifstream* file) {
    file -> close();
    delete file;
}
 
vector<string>* readFile(string filename) {
 
    vector<string>* lines = new vector<string>();
    ifstream* file = openFile(filename);
    if (file -> is_open()) {
        string line;
        while (getline(*file, line)) {
            lines -> push_back(line);
        }
        closeFile(file);
    }
    return lines;
}
 
int main() {
    string filename;
    vector<string>* lines = nullptr;
    while (true) {
 
        cout << "Enter file name: ";
        cin >> filename;
 
        if (lines != nullptr) {
            delete lines;
            lines = nullptr;
        }
 
        lines = readFile(filename);
        if (lines -> empty()) {
            cout << "error open " << filename << endl;
        }
        else {
            cout << "File Contents " << filename << ":" << endl;
            for (const auto& line : *lines) {
                cout << line << endl;
            }
        }
    }
    return 0;
}