AlgebraTutot_TimB_11-13

package Algebra_Tutor;

import java.util.Scanner;
import java.util.Random;

public class main {

    public static int generate_random_num(){
       Random random_num = new Random();
       int rand_num = -100 + random_num.nextInt(200);
       return rand_num;
    }

    public static void display_menu(){
    System.out.println("Please select from the 3 following modes of study. These will help you break down and understand the line
    equation (y = m(x) + b).");
    System.out.println("1. Solve for y.");
    System.out.println("2. Solve for m.");
    System.out.println("3. Solve for b.");
    System.out.println("4. Select to quit.");
    }

    public static boolean solve_for_y(){
    int m = generate_random_num();
    int x = generate_random_num();
    int b = generate_random_num();
    int y = 0;
    boolean correct = true;
    boolean incorrect = false;
    Scanner user_input = new Scanner(System.in);

    System.out.println("Solve for y in the below equation.");
    System.out.println("y = " + m + "(" + x + ") + " + b);
    y = user_input.nextInt();
    int correct_answer = m * x + b;

    if (correct_answer == y){
        System.out.println("Great job! You have entered the correct answer.");
        return correct;
        }
    else if (correct_answer != y){
        System.out.println("You have entered an incorrect answer.");
        return incorrect;
        }
    }

    public static boolean solve_for_m(){
    double m = 0;
    int x = generate_random_num();
    int b = generate_random_num();
    int y = generate_random_num();
    boolean correct = true;
    boolean incorrect = false;
    Scanner user_input = new Scanner(System.in);

    System.out.println("Solve for m in the below equation.");
    System.out.println(y + " = m(" + x + ") + " + b);
    m = user_input.nextDouble();
    double correct_answer = (y - b)/(x * 1.0);

    if (correct_answer == m){
        System.out.println("Great job!  You have entered the correct answer.");
        return correct;
        }
    else if (correct_answer != y){
        System.out.println("You have entered an incorrect answer.");
        return incorrect;
        }
    }

    public static boolean solve_for_b(){
    int m = generate_random_num();
    int x = generate_random_num();
    double b = 0;
    int y = generate_random_num();
    boolean correct = true;
    boolean incorrect = false;
    Scanner user_input = new Scanner(System.in);

    System.out.println("Solve for b in the below equation.");
    System.out.println(y + " = " + m + "(" + x + ") + b");
    b = user_input.nextDouble();
    double correct_answer = y - m * (x * 1.0);


    if (correct_answer == b){
        System.out.println("Great job! You have entered the correct answer.");
        return correct;
        }
    else if (correct_answer != b){
        System.out.println("You ahve entered an incorrect answer.");
        return incorrect;
        }
    }

    public static void Main(String[] args){

    Scanner user_input = new Scanner(System.in);
    int study_mode = 0;
    int correct_count = 0;
    int incorrect_count = 0;
    int total_questions = 0;

    while(study_mode != 4){
        display_menu();
        study_mode = user_input.nextInt();
        if (incorrect_count > 3){
            System.out.println("Remember to follow the order of operations.");
            incorrect_count = 0;
        }
        else if (study_mode == 1){
             solve_for_y();
             if (solve_for_y() == true){
             correct_count++;
             total_questions++;
             }
             else {
             incorrect_count++;
             total_questions++;
             }
        }
        else if (study_mode == 2){
             solve_for_m();
             if (solve_for_m() == true){
             correct_count++;
             total_questions++;
             }
             else {
             incorrect_count++;
             total_questions++;
            }
        }
        else if (study_mode == 3){
             solve_for_b();
             if (solve_for_b() == true){
             correct_count++;
             total_questions++;
             }
             else {
             incorrect_count++;
             total_questions++;
            }
        }

    System.out.println("You have quit.");

    }
  }
}