Lecture Notes on 10 Jun 2016

Read Chapter 3: Selections

Binary Arithmetic
  - Convert decimal numbers to 8 bit binary
  - Convert binary numbers to decimal
  - Represented negative numbers using 2's complement

Learning Java

* Write the Hello World program

* Characterset - ASCII and Unicode

* Variables -
    start with letter, underscore, $ sign
    followed by n number of letters, digits, and underscores and $ signs
    it cannot be reserved word

* Types
  - primitive
    short 16 bits
    int   32 bits
    long  64 bits
    float 32 bits
    double 64 bits
    char  16 bits
    boolean true or false
    byte  8 bits

  - reference
    String 
    Scanner

* Declare Variables
  int wheels;
  double gpa;
  char letter;
  boolean isSunny;
  String name;

* Define variables
  int wheels = 4;
  double gpa = 3.56;
  boolean isSunny = true;
  char letter = '\u006B';
  String name = "Alan";
  Scanner sc = new Scanner (System.in);

* Operators:
  - Arithmetic: + - * / % ++ --
  - Comparison: < <= > >= == !=
  - Boolean: ! && || ^
  - Bitwise
  - Shift



/*
  File: EasterSunday.java

  Description: this program computes Easter Sunday using Gauss' algorithm

  Student Name: John Doe

  Student UT EID: jd123

  Course Name: CS 312

  Unique Number: 87525

  Date Created: 10 Jun 2016

  Date Last Modified: 10 Jun 2016

*/

import java.util.Scanner;

public class EasterSunday
{
  public static void main (String[] args)
  {
    // create the Scanner object
    Scanner sc = new Scanner (System.in);

    // prompt user to enter year
    System.out.print ("Enter year: ");

    // read the year
    int y = sc.nextInt ();

    // compute Easter Sunday using Gauss' algorithm
    int a = y % 19;

    // fill in the computations

    int n = 4;

    int p = 15;

    // print out the result

    if (n == 3)
    {
      System.out.println ("\nIn " + y + ", Easter Sunday is on " + p + " March.");
    }

    if (n == 4)
    {
      System.out.println ("\nIn " + y + ", Easter Sunday is on " + p + " April.");
    }


  }
}