compiled-assignment.txt

#
#	JAVA PROGRAMMING ASSIGNMENT
#	BASIC APPROACHES
---------------------------------------------------------------------------------------


#	QUESTION 1 ~
-----------------------------------------------------------------------

/**
 * question 1
 * @author benkimz
 */
import java.util.Scanner;

public class IncomeDebtRatio{
    
    //DECLARE VARIABLES
    
    private static double debt = 0, income;
    private static double mortgages, automobile_loan, credit_loan;
    
    public static void main(String args[]){
        Scanner keyboard = new Scanner(System.in);
        //IncomeDebtRatio compute = new IncomeDebtRatio();
        int number_of_users = 2;
        // Loop 20 times requesting for details about several users
        for(int i = 0; i < number_of_users; i++){
            
            System.out.print("\n Enter User Details:-\n");
            /*
                * Take details about:
                * income, mortgages, automobile loans, credit loans
            */
            try{
                System.out.print("\n Income: ");
                income = keyboard.nextDouble();
                System.out.print("\n Mortgages: ");
                mortgages = keyboard.nextDouble();
                System.out.print("\n Automobile Loan: ");
                automobile_loan = keyboard.nextDouble();
                System.out.print("\n Credit Card Loan: ");
                credit_loan = keyboard.nextDouble();
                
                debt = mortgages + automobile_loan + credit_loan;
                // Print the debt income ratio
                // Debt / Income
                System.out.print("\n \t Debt / Income Ratio: " + 
                        (debt / income) + "\n");                
            }catch(Exception e){
                System.out.println("...........invalid input............");
            }
        }         
    }
}

#	QUESTION 2 ~
-----------------------------------------------------------------
/**
 *
 * @author benkimz
 */
import java.util.Scanner;
public class DistanceLearning {
    public static void dashes(int count){
        for(int i=0;i<count;i++){System.out.print("-");}
    }    
    public static void main(String args[]) {
        Scanner keypad = new Scanner(System.in);
        while(true){
            dashes(30); 
            try{
                System.out.print("\n Enter Hours: ");
                int hours = keypad.nextInt();
                if(hours <= 0){break;}
                double cost = 0;
                if(hours <= 15){
                    cost += hours * 500;
                }else{
                    cost += hours * 445;
                } 
                dashes(30);
                System.out.print("\n Total cost: " + cost + "\n");                 
            }catch(Exception e){
                break;
            }
        }
    }
}




#	QUESTION 3 ~ 
--------------------------------------------------------------
/**
 *
 * @author benkimz
 */
import java.util.Scanner;
public class BodyMassIndex {
    public static void dashes(int count){
        for(int i=0;i<count;i++){System.out.print("-");}
    }  
    public static void main(String args[]) {
        Scanner keypad = new Scanner(System.in);
        double weight, height;
        while(true){
            try{
                dashes(30);
                System.out.print("\n Enter Weight: "); 
                weight = keypad.nextDouble();
                System.out.print("\n Enter Height: "); 
                height = keypad.nextDouble();
                dashes(30);
                System.out.print("\n Your BMI is: " + 
                        (weight / (height * height)) + "\n");                
            }catch(Exception e){
                break;
            }
            System.out.print("\n BMI VALUES \n"); 
            dashes(30);
            
            System.out.print("\n UNDER WEIGHT" + "\t\t\t" + "LESS THAN 18.5");
            System.out.print("\n NORMAL" + "\t\t\t" + "BETWEEN 18.5 AND 24.9");
            System.out.print("\n OVERWEIGHT" + "\t\t\t" + "BETWEEN 25 AND 29.9");
            System.out.print("\n OBESE" + "\t\t\t" + "30 OR GREATER");
            
            
            System.out.print("\n\n");
        }
    }
}




#	QUESTION 4 ~
-------------------------------------------------------------------
/**
 *
 * @author benkimz
 */

import java.util.Scanner;

public class QuadraticEquations {
    public static void main(String args[]) {
        Scanner keypad = new Scanner(System.in);
        
        double discriminant;
        
        while(true){
            try{
                double a, b, c;
                System.out.print("\n Enter coefficient a: "); a = keypad.nextDouble();
                System.out.print("\n Enter coefficient b: "); b = keypad.nextDouble();
                System.out.print("\n Enter coefficient c: "); c = keypad.nextDouble();
                discriminant = Math.pow(b, 2) - (4 * a * c);
                
                
                // PRINT SOME DASHES FOR A NICE LOOK
                System.out.print('\n');for(int i=0;i<60;i++){System.out.print('-');}
                
                if(discriminant == 0){
                    //ROOT1 == ROOT2
                    System.out.print("\n The roots are real and identical: [" + 
                            (-b / 2 * a) + ", " + (-b / 2 * a) + "]\n\n");
                }else if(discriminant > 0){
                    //ROOTS ARE REAL BUT UNIDENTICAL
                    System.out.print("\n The roots are real and unidentical: [" + 
                            ((-b + Math.sqrt(discriminant)) / 2 * a) + ", " + ((-b - Math.sqrt(discriminant)) / 2 * a) + "]\n\n");               
                }else{
                    //THE ROOTS ARE COMPLEX
                    
                    System.out.print("\n The roots are complex: [" + 
                            String.format("%.2f " + "+" + " %.2fi", (-b / 2 * a), (Math.sqrt(-discriminant) / 2* a)) + 
                            ", " + String.format("%.2f " + "+" + " %.2fi", (-b / 2 * a), (Math.sqrt(-discriminant) / 2* a)) + "]\n\n");                 
                }
            
            }catch(Exception e){
                break;
            }
        }
    }
}

---------------------------------------------------------------------------------------



#
#	JAVA PROGRAMMING ASSIGNMENT
#	AN ADVANCED APPROACH
---------------------------------------------------------------------------------------


#	QUESTION 1 ~
-----------------------------------------------------------------
/**
 * question 1
 * @author benkimz
 */
import java.util.Scanner;

@FunctionalInterface
interface OutputFormatting{
    public abstract void dashes(int count);
}

public class IncomeDebtRatio{
    
    //DECLARE VARIABLES
    
    private static double debt, income;
    
    public static void main(String args[]){
        OutputFormatting format = (int count)->{
            for(int i=0;i<count;i++){System.out.print("-");}
        };
        Scanner keyboard = new Scanner(System.in);
        //IncomeDebtRatio compute = new IncomeDebtRatio();
        int users_no = 2;
        // Loop 20 times requesting for details about several users
        for(int i = 0; i < users_no; i++){
            format.dashes(30); debt = 0.0;
            System.out.print("\n Enter User Details:-\n");
            /*
                * Take details about:
                * income, mortgages, automobile loans, credit loans
            */
            try{
                System.out.print("\n Income: ");
                income = keyboard.nextDouble();
                System.out.print("\n Mortgages: ");
                debt += keyboard.nextDouble();
                System.out.print("\n Automobile Loan: ");
                debt += keyboard.nextDouble();
                System.out.print("\n Credit Card Loan: ");
                debt += keyboard.nextDouble();
                format.dashes(30);
                // Print the debt income ratio
                System.out.print("\n \t Debt / Income Ratio: " + 
                        (debt / income) + "\n");                
            }catch(Exception e){
                System.out.println("...........invalid input............");
            }
        }         
    }
}


#	QUESTION 3 ~
----------------------------------------------------------------
/**
 *
 * @author benkimz
 */
import java.util.Scanner;
public class BodyMassIndex {
    public static void dashes(int count){
        for(int i=0;i<count;i++){System.out.print("-");}
    }  
    public static void main(String args[]) {
        Scanner keypad = new Scanner(System.in);
        double weight, height;
        while(true){
            try{
                dashes(30);
                System.out.print("\n Enter Weight: "); 
                weight = keypad.nextDouble();
                System.out.print("\n Enter Height: "); 
                height = keypad.nextDouble();
                dashes(30);
                System.out.print("\n Your BMI is: " + 
                        (weight / (height * height)) + "\n");                
            }catch(Exception e){
                break;
            }
            System.out.print("\n BMI VALUES \n"); 
            dashes(30);
            printRow(2, "UNDER WEIGHT", "LESS THAN 18.5",
                    "NORMAL", "BETWEEN 18.5 AND 24.9",
                    "OVERWEIGHT", "BETWEEN 25 AND 29.9",
                    "OBESE", "30 OR GREATER");
            System.out.print("\n\n");
        }
    }
    public static void printRow(int cols, String... args){
        int k = cols;
        for(String element: args){
            if(k > 0){
                System.out.print(element + "\t\t\t");
            }else{
                System.out.print("\n" + element + "\t\t\t");
                k = cols;
            }
            k -= 1;
        }
    }
}



#	QUESTION 4 ~
----------------------------------------------------------------------
/**
 *
 * @author benkimz
 */

import java.util.Scanner;

@FunctionalInterface
interface RootsFinder{
    abstract void getRoots(double a, double b, double c);
}

class Complex{
    public String value(double real, double imaginary, String symb){
        return String.format("%.2f " + symb + " %.2fi", real, imaginary);
    }
    protected String symb;
    Complex(String... args){this.symb = args[0];}
}

public class QuadraticEquations {
    public static void main(String args[]) {
        //CUSTOM TYPE COMPLEX
        Complex complex = new Complex("j");
        
        RootsFinder roots = (double a, double b, double c) -> {
            double discriminant = Math.pow(b, 2) - (4 * a * c);
            System.out.print('\n');for(int i=0;i<60;i++){System.out.print('-');}
            if(discriminant == 0){
                //ROOT1 == ROOT2
                System.out.print("\n The roots are real and identical: [" + 
                        (-b / 2 * a) + ", " + (-b / 2 * a) + "]\n\n");
            }else if(discriminant > 0){
                //ROOTS ARE REAL BUT UNIDENTICAL
                System.out.print("\n The roots are real and unidentical: [" + 
                        ((-b + Math.sqrt(discriminant)) / 2 * a) + ", " + ((-b - Math.sqrt(discriminant)) / 2 * a) + "]\n\n");               
            }else{
                //THE ROOTS ARE COMPLEX
                System.out.print("\n The roots are complex: [" + 
                        complex.value((-b / 2 * a), (Math.sqrt(-discriminant) / 2* a), "+") + ", " + 
                        complex.value((-b / 2 * a), (Math.sqrt(-discriminant) / 2* a), "-") + "]\n\n");                 
            }
        };

        Scanner keypad = new Scanner(System.in);
        while(true){
            try{
                double a, b, c;
                System.out.print("\n Enter coefficient a: "); a = keypad.nextDouble();
                System.out.print("\n Enter coefficient b: "); b = keypad.nextDouble();
                System.out.print("\n Enter coefficient c: "); c = keypad.nextDouble();
                roots.getRoots(a, b, c);
            }catch(Exception e){
                break;
            }
        }
    }
}
---------------------------------------------------------------------------------------