Laboratory Activity: Selection Structure

BowlingGame.java

import java.util.Scanner;

public class BowlingGame {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		System.out.println("Program: BOWLING SCOREBOARD\n");
		int score, total1 = 0, total2 = 0;
		try{
			System.out.println("\nFirst Try\n");
			System.out.println("Player1 Score:");
			score = sc.nextInt();
			total1+=score;
			System.out.println("Player2 Score:");
			score = sc.nextInt();
			total2+=score;
			System.out.println("\nSecond Try\n");
			System.out.println("Player1 Score:");
			score = sc.nextInt();
			total1+=score;
			System.out.println("Player2 Score:");
			score = sc.nextInt();
			total2+=score;
			System.out.println("\nThird Try\n");
			System.out.println("Player1 Score:");
			score = sc.nextInt();
			total1+=score;
			System.out.println("Player2 Score;");
			score = sc.nextInt();
			total2+=score;
			System.out.println("\nPlayer 1 Total Score : "+total1);
			System.out.println("Player 2 Total Score : "+total2);
			if (total1 > total2) System.out.println("\nCongratulations, Player 1. You won.");
			else if (total1 < total2) System.out.println("\nCongratulations, Player 2. You won.");
			else System.out.println("\nDraw!");
		}
		catch (Exception e) {
			System.out.println("\nInput error!");
		}
	}

}

CalculatorMenuSwitch.java

import java.util.Scanner;

public class CalculatorMenuSwitch {

	public static void main(String[] args) {
		Scanner sc = new Scanner (System.in);
		int num1, num2;
		char choice;
		System.out.println("Program: Simple Calculator\n");
		System.out.print("(1) Enter first number: ");
		num1 = sc.nextInt();
		sc.nextLine();
		System.out.print("(2) Enter second number: ");
		num2 = sc.nextInt();
		System.out.print("(3) Operations:\n[A]dd\n[S]ubtract\n[M]ultiply\n[D]ivide\n[Q]uit\n\nChoose operation to use: ");
		choice = sc.next().toLowerCase().charAt(0);
		switch(choice) {
		case 'a': System.out.println("\nResult: "+(num1 + num2)); break;
		case 's': System.out.println("\nResult: "+(num1 - num2)); break;
		case 'm': System.out.println("\nResult: "+(num1 * num2)); break;
		case 'd': System.out.println("\nResult: "+((double)(num1) / num2)); break;
		default: System.out.println("\nProgram terminating…");
		}
	}
}

DevelopmentalTask.java

import java.util.Scanner;

public class DevelopmentalTask {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		System.out.println("Program: Developmental Task Stage\n");
		System.out.println("Enter age: ");
		try {
			double age = sc.nextDouble();
			if (age < 0)
				System.err.println("\nError: There is no such thing as a negative age!");
			else if (age > 60) System.out.println("\nResult:\nLater Maturity");
			else if (age >= 36 && age <= 60) System.out.println("\nResult:\nMiddle Age");
			else if (age >= 18 && age < 36) System.out.println("\nResult:\nEarly Adulthood");
			else if (age >= 13 && age < 18) System.out.println("\nResult:\nAdolescence");
			else if (age >= 6 && age < 13) System.out.println("\nResult:\nMiddle Childhood");
			else System.out.println("\nResult:\nInfancy and Early Childhood");
		}
		catch(Exception e){
			System.err.println("\nError: Invalid input!");
		}
	}

}

GradeValidation.java

import java.util.Scanner;

public class GradeValidation {
	
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		System.out.println("Program: REMARKS FOR GRADES\n");
		System.out.println("Note: You can only input numbers between 0 to 100.\n");
		System.out.print("Enter grade: ");
		try {
			double grade = sc.nextDouble();
			if (grade > 100 || grade < 0)
				System.err.println("\nError: Out of range!");
			else if (grade >=90 && grade <= 100) System.out.println("\nRemarks: Excellent");
			else if (grade >=85 && grade < 90) System.out.println("\nRemarks: Very Good");
			else if (grade >=80 && grade < 85) System.out.println("\nRemarks: Good");
			else if (grade >=75 && grade < 80) System.out.println("\nRemarks: Poor");
			else System.out.println("\nRemarks: Fail");
		}
		catch(Exception e){
			System.err.println("\nError: Invalid input!");
		}
	}

}

MenuCalculatorIf.java

import java.util.Scanner;

public class MenuCalculatorIf {

	public static void main(String[] args) {
		Scanner sc = new Scanner (System.in);
		int num1, num2;
		char choice;
		System.out.println("Program: Simple Calculator\n");
		System.out.print("(1) Enter first number: ");
		num1 = sc.nextInt();
		sc.nextLine();
		System.out.print("(2) Enter second number: ");
		num2 = sc.nextInt();
		System.out.print("(3) Operations:\n[A]dd\n[S]ubtract\n[M]ultiply\n[D]ivide\n[Q]uit\n\nChoose operation to use: ");
		choice = sc.next().toLowerCase().charAt(0);
		if(choice == 'a') System.out.println("\nResult: "+(num1 + num2));
		else if(choice == 's') System.out.println("\nResult: "+(num1 -num2));
		else if(choice == 'm') System.out.println("\nResult: "+(num1 * num2));
		else if(choice == 'd') System.out.println("\nResult: "+((double)(num1) / num2));
		else System.out.println("\nProgram terminating…");
	}

}

OddEvenValidation.java

import java.util.Scanner;

public class OddEvenValidation {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		System.out.println("Program: ODD-EVEN NUMBER DETECTOR\n");
		System.out.println("\nNote: You can only input numbers between\n"+Long.MIN_VALUE+" and"+Long.MAX_VALUE+".\n\n");
		System.out.println("Please enter a number:");
		try{
		long x = sc.nextLong();
		if (x % 2 == 0) System.out.println("\nResult:\n"+x+" is EVEN!");
		else System.out.println("\nResult:\n"+x+" is ODD!");
		}
		catch (Exception e) {
		System.out.println("\nInput error! Please input a number and it should be\nwithin the maximum and minimun limits.");
		}
	}
}

OwnerValidation.java

import java.util.Scanner;

public class OwnerValidation {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		System.out.print("Program: OWNER VALIDATION\n");
		System.out.print("\nEnter Owner's Name: ");
		String owner = sc.next();
		System.out.print("Result: ");
		if(owner.equalsIgnoreCase("mart") || owner.equalsIgnoreCase("anne")) System.out.print("is the owner!");
		else System.out.print("is owner of nothing");
	}
}

Payroll.java

import java.util.Scanner;

public class Payroll {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		double base, total=0;
		System.out.println("Program: PAYROLL (Weekly)");
		System.out.print("\nEnter Base Pay Per Hour ($): ");
		base = sc.nextFloat(); sc.nextLine();
		System.out.print("Enter Hours Worked: ");
		int hours = sc.nextInt(); sc.nextLine();
		if (base < 8 || hours > 60 || base < 0 || hours < 0) {
			System.err.println("Error! One of the inputs or more violates the requirements.");
			System.exit(0);
			}
		else if (hours <= 40) total = hours * base;
		else if (hours > 40) total = 40 * base + (hours - 40) * base * 1.5;
		System.out.printf("Total Wage: $%,.2f",total);
	}
}

PointGradeValidation.java

import java.util.Scanner;

public class PointGradeValidation {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int sID = 0;
		double exam1, exam2, exam3, exam4, average = 0, grade = 0;
		String name, dept, course, subj, remarks = "";
		System.out.println("Program: Student Average Grade Calculator\n");
		System.out.println("Please fill out the following fields:");
		try { // Try-Catch to only allow NUMBERS for Student ID Number
			System.out.print("Student ID\t\t: ");
			sID = sc.nextInt();
			sc.nextLine(); // This is necessary to position the pointer to the next line
		}
		catch(Exception e) { // Error Message in case someone types letters/special characters on Student ID
			System.err.println("\nError: Student ID should only contain numbers. Please start the program again.");
		}
		System.out.print("Name\t\t\t: ");
		name = sc.nextLine();
		System.out.print("Department\t\t: ");
		dept = sc.nextLine();
		System.out.print("Course\t\t\t: ");
		course = sc.nextLine();
		System.out.print("Subject\t\t\t: ");
		subj = sc.nextLine();
		try { 				// Try-Catch to only allow NUMBERS for Exam Grades
		System.out.print("First Examination\t: ");
		exam1 = sc.nextDouble();
		System.out.print("Second Examination\t: ");
		exam2 = sc.nextDouble();
		System.out.print("Third Examination\t: ");
		exam3 = sc.nextDouble();
		System.out.print("Final Examination\t: ");
		exam4 = sc.nextDouble();

		 /*************** PROCESS ***************/
		if ((exam1 < 0 || exam1 > 100)&&(exam2 < 0 || exam2 >
		100)&&(exam3 < 0 || exam3 > 100)&&(exam4 < 0 || exam4 > 100)) {
		System.err.println("\nError: One of the grades or more is/are not between 0 and 100!");
		System.exit(0);
		}
		average = (exam1+exam2+exam3+exam4)/4; // Average of 4 Exams
		grade = (100-average+10)/10; // Point Grade Formula
		if (average < 0 || average > 100)
			System.err.println("\nError: Out of range or invalid");
		else if (average == 100) remarks = "Passed-Excellent";
		else if (average >= 90 && average < 100) remarks = "Passed-Very Good";
		else if (average >= 85 && average < 90) remarks = "Passed-Average";
		else if (average >= 80 && average < 85) remarks = "Passed-Good";
		else if (average >= 75 && average < 80) remarks = "Passed-Satisfactory";
		else if (average >= 50 && average < 75) {
			remarks = "Failed";
			grade = 5.0;
		}
		else if (average > 0 && average < 50) {
			remarks = "Dropped";
			grade = 9.0;
		}
		else if (average == 0) {
			remarks = "No such grade";
			grade = 0.0;
		}

		/*************** OUTPUT ***************/
		System.out.println("--------Student Details--------");
		System.out.println("ID\t\t: "+sID);
		System.out.println("Name\t\t: "+name);
		System.out.println("Department\t: "+dept);
		System.out.println("Course\t\t: "+course);
		System.out.println("Subject\t\t: "+subj);
		System.out.println("---------Grade Details---------");
		System.out.println("First\tSecond\tThird\tFourth");
		System.out.println(exam1+"\t"+exam2+"\t"+exam3+"\t"+exam4);
		System.out.printf("Average\t\t: %.2f\n",average);
		System.out.printf("Point Grade\t: %.2f\n",grade);
		System.out.println("Remarks\t\t: "+remarks);
		}
		catch(Exception e){ // Error Message in case someone types letters/special characters on Exam Scores
		System.err.println("\nError: Invalid input!");
		}


	}

}

PositiveNegative.java

import java.util.Scanner;

public class PositiveNegative {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		System.out.println("Program: POSITIVE-NEGATIVE NUMBER DETECTOR\n");
		System.out.println("\nNote: You can only input numbers between\n"+Long.MIN_VALUE+" and"+Long.MAX_VALUE+".\n\n");
		System.out.println("Please enter a number:");
		try{
		long x = sc.nextLong();
		if (x == 0) System.out.println("\nResult:\n"+x+" is neither positive nor negative.");
		else if (x > 0) System.out.println("\nResult:\n"+x+" is POSITIVE!");
		else System.out.println("\nResult:\n"+x+" is NEGATIVE!");
		}
		catch (Exception e) {
		System.out.println("\nInput error! Please input a number and it should bewithin the maximum and minimun limits.");
		}
	}

}

TrafficLight.java

import java.util.Scanner;

public class TrafficLight {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		System.out.println("Program: TRAFFIC LIGHT COLORS\n");
		System.out.println("Available Colors: Green, Orange, Red");
		System.out.print("\nEnter color: ");
		String color = sc.next();
		System.out.print("Result: ");
		if(color.equalsIgnoreCase("green")) System.out.print("Go!");
		else if(color.equalsIgnoreCase("orange")) System.out.print("Ready!");
		else if(color.equalsIgnoreCase("red")) System.out.print("Stop!");
		else System.out.print("That color does not belong to the traffic light colors specified above.");
	}
}

UserAccountValidation.java

import java.util.Scanner;

public class UserAccountValidation {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		System.out.print("Program: Simple Calculator with Login\n");
		System.out.print("\nEnter username\t: ");
		String user = sc.next(); sc.nextLine();
		System.out.print("Enter password\t: ");
		String pass = sc.next(); sc.nextLine();
		if (user.equalsIgnoreCase("admin") && pass.equalsIgnoreCase("pwd12345")) {
			int num1, num2;
			char choice;
			System.out.println("\nProgram: Simple Calculator\n");
			System.out.print("(1) Enter first number: ");
			num1 = sc.nextInt();
			sc.nextLine();
			System.out.print("(2) Enter second number: ");
			num2 = sc.nextInt();
			System.out.print("(3) Operations:\n[A]dd\n[S]ubtract\n[M]ultiply\n[D]ivide\n[Q]uit\n\nChoose operation to use: ");
			choice = sc.next().toLowerCase().charAt(0);
			switch(choice) {
			case 'a': System.out.println("\nResult: "+(num1 + num2)); break;
			case 's': System.out.println("\nResult: "+(num1 - num2)); break;
			case 'm': System.out.println("\nResult: "+(num1 * num2)); break;
			case 'd': System.out.println("\nResult: "+((double)(num1) / num2)); break;
			default: System.out.println("\nProgram terminating…");
			}
		}
		else System.err.println("Invalid username and password combination!");
	}
}