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@rjlutz rjlutz/AdditionQuiz.java
Last active Jun 11, 2017

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Selections - examples from Liang Intro to Java Comprehensive 10e
import java.util.Scanner;
public class AdditionQuiz {
public static void main(String[] args) {
int number1 = (int)(System.currentTimeMillis() % 10);
int number2 = (int)(System.currentTimeMillis() / 7 % 10);
// Create a Scanner
Scanner input = new Scanner(System.in);
System.out.print(
"What is " + number1 + " + " + number2 + "? ");
int answer = input.nextInt();
System.out.println(
number1 + " + " + number2 + " = " + answer + " is " +
(number1 + number2 == answer));
}
}
import java.util.Scanner;
public class ChineseZodiac {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.print("Enter a year: ");
int year = input.nextInt();
switch (year % 12) {
case 0: System.out.println("monkey"); break;
case 1: System.out.println("rooster"); break;
case 2: System.out.println("dog"); break;
case 3: System.out.println("pig"); break;
case 4: System.out.println("rat"); break;
case 5: System.out.println("ox"); break;
case 6: System.out.println("tiger"); break;
case 7: System.out.println("rabbit"); break;
case 8: System.out.println("dragon"); break;
case 9: System.out.println("snake"); break;
case 10: System.out.println("horse"); break;
case 11: System.out.println("sheep"); break;
}
}
}
import java.util.Scanner;
public class ComputeAndInterpretBMI {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
// Prompt the user to enter weight in pounds
System.out.print("Enter weight in pounds: ");
double weight = input.nextDouble();
// Prompt the user to enter height in inches
System.out.print("Enter height in inches: ");
double height = input.nextDouble();
final double KILOGRAMS_PER_POUND = 0.45359237; // Constant
final double METERS_PER_INCH = 0.0254; // Constant
// Compute BMI
double weightInKilograms = weight * KILOGRAMS_PER_POUND;
double heightInMeters = height * METERS_PER_INCH;
double bmi = weightInKilograms /
(heightInMeters * heightInMeters);
// Display result
System.out.println("BMI is " + bmi);
if (bmi < 18.5)
System.out.println("Underweight");
else if (bmi < 25)
System.out.println("Normal");
else if (bmi < 30)
System.out.println("Overweight");
else
System.out.println("Obese");
}
}
import java.util.Scanner;
public class ComputeTax {
public static void main(String[] args) {
// Create a Scanner
Scanner input = new Scanner(System.in);
// Prompt the user to enter filing status
System.out.print("(0-single filer, 1-married jointly or " +
"qualifying widow(er), 2-married separately, 3-head of " +
"household) Enter the filing status: ");
int status = input.nextInt();
// Prompt the user to enter taxable income
System.out.print("Enter the taxable income: ");
double income = input.nextDouble();
// Compute tax
double tax = 0;
if (status == 0) { // Compute tax for single filers
if (income <= 8350)
tax = income * 0.10;
else if (income <= 33950)
tax = 8350 * 0.10 + (income - 8350) * 0.15;
else if (income <= 82250)
tax = 8350 * 0.10 + (33950 - 8350) * 0.15 +
(income - 33950) * 0.25;
else if (income <= 171550)
tax = 8350 * 0.10 + (33950 - 8350) * 0.15 +
(82250 - 33950) * 0.25 + (income - 82250) * 0.28;
else if (income <= 372950)
tax = 8350 * 0.10 + (33950 - 8350) * 0.15 +
(82250 - 33950) * 0.25 + (171550 - 82250) * 0.28 +
(income - 171550) * 0.33;
else
tax = 8350 * 0.10 + (33950 - 8350) * 0.15 +
(82250 - 33950) * 0.25 + (171550 - 82250) * 0.28 +
(372950 - 171550) * 0.33 + (income - 372950) * 0.35;
}
else if (status == 1) { // Compute tax for married file jointly
// Left as exercise
}
else if (status == 2) { // Compute tax for married separately
// Left as exercise
}
else if (status == 3) { // Compute tax for head of household
// Left as exercise
}
else {
System.out.println("Error: invalid status");
System.exit(1);
}
// Display the result
System.out.println("Tax is " + (int)(tax * 100) / 100.0);
}
}
import java.util.Scanner;
public class LeapYear {
public static void main(String args[]) {
// Create a Scanner
Scanner input = new Scanner(System.in);
System.out.print("Enter a year: ");
int year = input.nextInt();
// Check if the year is a leap year
boolean isLeapYear =
(year % 4 == 0 && year % 100 != 0) || (year % 400 == 0);
// Display the result in a message dialog box
System.out.println(year + " is a leap year? " + isLeapYear);
}
}
import java.util.Scanner;
public class Lottery {
public static void main(String[] args) {
// Generate a lottery
int lottery = (int)(Math.random() * 100);
// Prompt the user to enter a guess
Scanner input = new Scanner(System.in);
System.out.print("Enter your lottery pick (two digits): ");
int guess = input.nextInt();
// Get digits from lottery
int lotteryDigit1 = lottery / 10;
int lotteryDigit2 = lottery % 10;
// Get digits from guess
int guessDigit1 = guess / 10;
int guessDigit2 = guess % 10;
System.out.println("The lottery number is " + lottery);
// Check the guess
if (guess == lottery)
System.out.println("Exact match: you win $10,000");
else if (guessDigit2 == lotteryDigit1
&& guessDigit1 == lotteryDigit2)
System.out.println("Match all digits: you win $3,000");
else if (guessDigit1 == lotteryDigit1
|| guessDigit1 == lotteryDigit2
|| guessDigit2 == lotteryDigit1
|| guessDigit2 == lotteryDigit2)
System.out.println("Match one digit: you win $1,000");
else
System.out.println("Sorry, no match");
}
}
import java.util.Scanner;
public class SimpleIfDemo {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.println("Enter an integer: ");
int number = input.nextInt();
if (number % 5 == 0)
System.out.println("HiFive");
if (number % 2 == 0)
System.out.println("HiEven");
}
}
import java.util.Scanner;
public class SubtractionQuiz {
public static void main(String[] args) {
// 1. Generate two random single-digit integers
int number1 = (int)(Math.random() * 10);
int number2 = (int)(Math.random() * 10);
// 2. If number1 < number2, swap number1 with number2
if (number1 < number2) {
int temp = number1;
number1 = number2;
number2 = temp;
}
// 3. Prompt the student to answer �what is number1 � number2?�
System.out.print
("What is " + number1 + " - " + number2 + "? ");
Scanner input = new Scanner(System.in);
int answer = input.nextInt();
// 4. Grade the answer and display the result
if (number1 - number2 == answer)
System.out.println("You are correct!");
else {
System.out.println("Your answer is wrong.");
System.out.println(number1 + " - " + number2 +
" should be " + (number1 - number2));
}
}
}
import java.util.Scanner;
public class TestBooleanOperators {
public static void main(String[] args) {
// Create a Scanner
Scanner input = new Scanner(System.in);
// Receive an input
System.out.print("Enter an integer: ");
int number = input.nextInt();
if (number % 2 == 0 && number % 3 == 0)
System.out.println(number + " is divisible by 2 and 3.");
if (number % 2 == 0 || number % 3 == 0)
System.out.println(number + " is divisible by 2 or 3.");
if (number % 2 == 0 ^ number % 3 == 0)
System.out.println(number +
" divisible by 2 or 3, but not both.");
}
}
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