public class Homework1_1 {

public static void main(String[] args) {
int radius = 2;
double area;
final double pi = 3.142;

area= pi * radius * radius;

System.out.println("The area is: " + area);
}

}

public class Homework1_2 {

public static void main(String[] args) {
int radius;
double pi;
double area;

Scanner readInput = new Scanner(System.in);

//extra line feed
System.out.println();

System.out.print("Enter pi: ");
pi = readInput.nextDouble();

System.out.print("Enter the radius: ");
radius = readInput.nextInt();

area= pi * radius * radius;

System.out.println("The area is: " + area);
}

}

public class Homework1_3 {

public static void main(String[] args) {
double pi;
double area;

Scanner readInput = new Scanner(System.in);

//extra line feed
System.out.println();

System.out.print("Enter pi: ");
pi = readInput.nextDouble();

System.out.print("Enter the radius: ");
byte newRadius = readInput.nextByte();

area= pi * newRadius * newRadius;
System.out.println("The area is: " + area);

//extra line feed
System.out.println();
System.out.print("What is your first name?: ");
char yourInitial = readInput.next().charAt(0);

System.out.println("Hello Mr. " + yourInitial + ".");

//the input buffer will still have enter character '\n'
// so that needs to be cleaned.
//You can do that by using .nextLine() method.
readInput.nextLine();

//extra line feed
System.out.println();
System.out.printf("5185 is fun course.\n\n");

System.out.printf("First Name \tLast Name \tCity \n");
System.out.printf("----------- \t--------- \t--- \n");
System.out.printf("Bill    \tClinton \tHarlem\n");

System.out.printf("\n");

//extra line feed
System.out.println();
System.out.printf("How do you print double quotes?\n");
System.out.printf("Who said\"Test Scores Can Be Used ....\"\n");

String firstName;
String lastName;
String city;
String zipCode;

System.out.print("What is your first name: ");
firstName = readInput.next();
while (firstName.length() < 11)
   firstName += " ";
System.out.print("What is your last name: ");
lastName = readInput.next();
while (lastName.length() < 11)
   lastName += " ";
System.out.print("What is your city: ");
city = readInput.next();
while (city.length() < 11)
   city += " ";
System.out.print("What is your zip code: ");
zipCode = readInput.next();

System.out.printf("First Name \tLast Name \tCity    \tZip Code \n");
System.out.printf("----------- \t--------- \t---    \t---- \n");
System.out.printf(firstName + " \t" + lastName + " \t" + city + " \t" + zipCode + " \n");
}
}

Project: Calculating Future Investment Value Problem Description:...