Lesson 3 Homework - Boolean Expressions and if Statements
import java.util.Scanner;
public class Exercise2 {
public static void main(String[] Strings) {
Scanner input = new Scanner(System.in);
System.out.print("Input a: ");
double a = input.nextDouble();
System.out.print("Input b: ");
double b = input.nextDouble();
System.out.print("Input c: ");
double c = input.nextDouble();
double result = b * b - 4.0 * a * c;
if (result > 0.0) {
double r1 = (-b + Math.pow(result, 0.5)) / (2.0 * a);
double r2 = (-b - Math.pow(result, 0.5)) / (2.0 * a);
System.out.println("The roots are " + r1 + " and " + r2);
} else if (result == 0.0) {
double r1 = -b / (2.0 * a);
System.out.println("The root is " + r1);
} else {
System.out.println("The equation has no real roots.");
}
}
}
Exercise2.main(null);
import java.util.Scanner;
public class Exercise4 {
public static void main(String[] args)
{
Scanner in = new Scanner(System.in);
System.out.print("Input value: ");
double input = in.nextDouble();
if (input > 0)
{
if (input < 1)
{
System.out.println("Positive small number");
}
else if (input > 1000000)
{
System.out.println("Positive large number");
}
else
{
System.out.println("Positive number");
}
}
else if (input < 0)
{
if (Math.abs(input) < 1)
{
System.out.println("Negative small number");
}
else if (Math.abs(input) > 1000000)
{
System.out.println("Negative large number");
}
else
{
System.out.println("Negative number");
}
}
else
{
System.out.println("Zero");
}
}
}
Exercise4.main(null);
import java.util.Scanner;
public class Exercise6 {
public static void main(String[] args)
{
Scanner in = new Scanner(System.in);
System.out.print("Input floating-point number: ");
double x = in.nextDouble();
System.out.print("Input floating-point another number: ");
double y = in.nextDouble();
x = Math.round(x * 1000);
x = x / 1000;
y = Math.round(y * 1000);
y = y / 1000;
if (x == y)
{
System.out.println("They are the same up to three decimal places");
}
else
{
System.out.println("They are different");
}
}
}
Exercise6.main(null);
import java.util.Scanner;
public class Exercise8 {
public static void main(String[] args)
{
Scanner in = new Scanner(System.in);
System.out.print("Input an alphabet: ");
String input = in.next().toLowerCase();
boolean uppercase = input.charAt(0) >= 65 && input.charAt(0) <= 90;
boolean lowercase = input.charAt(0) >= 97 && input.charAt(0) <= 122;
boolean vowels = input.equals("a") || input.equals("e") || input.equals("i")
|| input.equals("o") || input.equals("u");
if (input.length() > 1)
{
System.out.println("Error. Not a single character.");
}
else if (!(uppercase || lowercase))
{
System.out.println("Error. Not a letter. Enter uppercase or lowercase letter.");
}
else if (vowels)
{
System.out.println("Input letter is Vowel");
}
else
{
System.out.println("Input letter is Consonant");
}
}
}
Exercise8.main(null);
public class Exercise10 {
public static void main(String[] args)
{
int i;
System.out.println ("The first 10 natural numbers are:\n");
for (i=1;i<=10;i++)
{
System.out.println (i);
}
System.out.println ("\n");
}
}
Exercise10.main(null);
import java.util.Scanner;
public class Exercise12 {
public static void main(String[] args)
{
int i,n=0,s=0;
double avg;
{
System.out.println("Input the 5 numbers : ");
}
for (i=0;i<5;i++)
{
Scanner in = new Scanner(System.in);
n = in.nextInt();
s +=n;
}
avg=s/5;
System.out.println("The sum of 5 no is : " +s+"\nThe Average is : " +avg);
}
}
Exercise12.main(null);
import java.util.Scanner;
public class Exercise14 {
public static void main(String[] args)
{
int j,n;
System.out.print("Input the number(Table to be calculated): ");
{
System.out.print("Input number of terms : ");
Scanner in = new Scanner(System.in);
n = in.nextInt();
System.out.println ("\n");
for(j=0;j<=n;j++)
System.out.println(n+" X "+j+" = " +n*j);
}
}
}
Exercise14.main(null);
import java.util.Scanner;
public class Exercise16 {
public static void main(String[] args)
{
int i,j,n;
System.out.print("Input number of rows : ");
Scanner in = new Scanner(System.in);
n = in.nextInt();
for(i=1;i<=n;i++)
{
for(j=1;j<=i;j++)
System.out.print(j);
System.out.println("");
}
}
}
Exercise16.main(null);
import java.util.Scanner;
public class Exercise18 {
public static void main(String[] args)
{
int i,j,n,k=1;
System.out.print("Input number of rows : ");
Scanner in = new Scanner(System.in);
n = in.nextInt();
for(i=1;i<=n;i++)
{
for(j=1;j<=i;j++)
System.out.print(k++);
System.out.println("");
}
}
}
Exercise18.main(null);
import java.util.Scanner;
public class Exercise20 {
public static void main(String[] args)
{
int numberOfRows;
System.out.print("Input number of rows : ");
Scanner in = new Scanner(System.in);
numberOfRows = in.nextInt();
int number = 1;
for (int row = 1; row <= numberOfRows; row++)
{
for (int column = 1; column <= row; column++)
{
System.out.print(number + " ");
number++;
}
System.out.println();
}
}
}
Exercise20.main(null);
Notes
- if the boolean expression is true or false dictates whether the code will run
- if-else statements sets up alternate code if the first expression turns false
- else-if statements allow for more conditions to be defined
-
De Morgan's law:
-
!(a&&b) = (!a || !b)
-
!(a || b) = (!a && !b)
-
- Comparing objects through ==