gistfile1.cpp

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

// Creates the structure Scenea
struct Scene { 
    // Constructor that passes the arguments to text and to next which sets scene_text to the value of text and next_scenes to the value of next
    Scene(std::string text, std::vector<int> const& next) { 
        scene_text = text; 
        next_scenes = next; 
    }
 
    // Declares scene_text as type string
    std::string scene_text; 

    // Creates the vector next_scenes
    std::vector<int> next_scenes; 
}; 
 
int main() {

    // Creates a vector of the type Scene called scenes
    std::vector<Scene> scenes;

    // Creates an input stream called "in" that reads from "data.scn"
    std::ifstream in("data.scn"); 

    while(true) {

        // Creates the string scene_text and sets its value to ""
        std::string scene_text = ""; 

        // If the user does not enter anything, then break
        if (!std::getline(std::cin, scene_text)) 
            break; 

        // Creates a vector of type int titled "choices"
        std::vector<int> choices; 

        // Creates an integer titled choice and sets it to 0
        int choice = 0; 

        // While the user enters something to be stored in choice, create a new memory cell in the vector choices with the value of choice
        while (std::cin >> choice) 
             choices.push_back(choice); 

        // Ignore the previous newline characters in the cin buffer 1024 times
        std::cin.ignore('\n', 1024); // 1024 can be any big number. 

        // Add a new memory cell to the vector scenes containing an instance of Scene with the arguements scene_text and choices
        scenes.push_back(Scene(scene_text, choices)); 
    }

    // Create an integer titled "current"
    int current = 0; 

    // While true != null...
    while (true) { 
        // Create a variable titled "choice" with the value 0
        int choice = 0; 

        // Output the content of the scene with the value of current's member variable scene_text then go to the next line
        std::cout << scenes[current].scene_text << std::endl; 

        // Take in the user's choice and store it in choice
        std::cin >> choice; 

        // Sets current to the value of the vector scene's memory cell with the value of current's member variable next_scenes with the memory cell choice
        current = scenes[current].next_scenes[choice]; 
    } 
}