/**
 * Simple number guessing game, annotated
 * @author Patrick Kage
 */

// include some standard functions
#include <stdlib.h>
#include <stdbool.h>

// standard input/output
#include <stdio.h>

// random number generator (+ time to seed RNG)
#include <time.h>
#include <ranlib.h>

/*
 * Here is the main function. It's the entry point for the application.
 * Don't worry too much about the arguments for now.
 */
int main(int argc, char** argv) {
    // First, let's seed the random number generator
    srand(time(0));

    // Generate a number 1-100. rand() generates a random integer, so we need
    // to take the modulo to get a number within our desired range.
    int target_number = rand() % 100;

    // Next, print our welcome message. printf() is the standard way of writing
    // to the terminal. Note that we explicitly have to add a newline to the end
    // of the statement
    printf("Welcome to the guessing game! Guess our number 1-100.\n");

    // Next, let's declare some variables for later.
    int guess = 0; // creates an integer
    char input[60]; // creates an array of length 60 filled with uninitialized data

    // Start the game loop
    while (true) {
        // Prompt for a guess, read into an input
        printf("Guess: ");
        scanf("%s", input);

        // Convert from string to int. If this fails, it's set to zero and a
        // global variable called errno is set.
        guess = atoi(input);

        // Handle the guess
        if (guess > target_number) {
            printf("Lower!\n");
        } else if (guess < target_number) {
            printf("Higher!\n");
        } else {
            // If we win, break out of the game loop
            printf("Hooray!\n");
            break;
        }
    }

    // Returning a number from the main function indicates whether the program
    // ran successfully. A non-zero exit code indicates a failure.
    return 0;
}