Logic & Computation Binary Tree Lecture 1
/**
* Lecture 1
*
* Code for students to begin investigating conditional operators and branching in Java, along with initializing Java primitives.
*
*/
import java.util.Scanner; // needed for Scanner to get user input
public class Lecture1
{
public static void main(String[] args)
{
// OUT OF BOUNDS
Scanner scanner = new Scanner( System.in ); //open a scanner for keyboard input from the user
int x, y; //int variables can only store integer values. Should be used over doubles when possible
double a, b, swap; //double variables can store decimal values
char letter; //char variables store a single character, such as 'c', '2', or '-' to give examples.
String word; //String variables store a sequence of characters, such as "asdf", "Wordy!", or better yet, "Hello World!"
//prompt user for input and receive it from the keyboard
System.out.println("Enter any number (positve, negative, integer, or decimal): ");
//get the first number from the user in Java
a = scanner.nextDouble(); //parses user input and finds a floating point value in the user-entered teat
System.out.println("\nEnter a second number (positve, negative, integer, or decimal): ");
//get the second number from the user in Java
b = scanner.nextDouble();
scanner.close(); //close the scanner
System.out.println("\n\n");
if(a > b) //swap a and b so that a < b
{
swap = a;
a = b;
b = swap;
}
//perform examples of conditional branching
if(a > 0 && b > 0)
{
System.out.println("\nEach of your numbers is positive.");
}
else if(a < 0 && b < 0)
{
System.out.println("\nEach of your numbers is negative.");
}
else if((a < 0 && b > 0) || (a > 0 && b < 0))
{
System.out.println("\nOne of your numbers is negative and the other is positive.");
if(a < 0)
{
System.out.println(a + " is the negative number.");
}
else
{
System.out.println(b + " is the negative number.");
}
//OUT OF BOUNDS
}
} //end of main
} //end of Lecture1
