1. Lesson 2: Program design process & Intro to code
Unit 1: Introduction
Lesson 2: Program design process & Intro to code

2. Program Design Process
Define – Purpose, Input, Processes, Output (remember: P.I.P.O)
Visualize – What does the Input area look like? What does the Output Area look like?
Algorithm – Organize when input is received, when data is stored, when operations are performed when output is displayed etc.
Pre-Debug – Look for logical/organization errors in your algorithm
Program – Write the code based on your algorithm and syntax
Debug – Fix all syntactical errors & Logic/Mathematic errors
Accuracy check – Did your program give the result you wanted? If not, check your algorithm
(repeat the last two steps until the program works properly)

3. Program “Skeleton”
public class ProgramName { public static void main (String[] args) { //Variable Declarations //Input Statements //Processing/Logic Statements //Output Statements } }

4. Declaring a Variable Non Initialized Variable
VariableType VariableName ;
int myVariable;
Initialized Variable
VariableType VariableName = InitialValue;
int myVariable = 10;
Final (Immutable Variable)
final VariableType VARIABLENAME;
final int MYVARIABLE = 10;

5. Output Any data displayed to the user is considered output
Output will generally take two forms Editable/Non-Editable
Non-Editable – System.out.print (“ “); System.out.println (“ “); JOptionPane.showMessageDialog (“ “);
Editable - JOptionPane.showInputDialog (“ “);

6. Simple Program
public class SomeMath { public static void main (String [] args) { //Variable Declarations float numOne = 10; float numTwo = 5; float answer; //Arithmetic answer = numOne + numTwo; //Output System.out.println(“10 plus 5 is ” + answer) } }

7. Common Operators (Reference)
Relational
Arithmetic
Assignment
<
Less Than +
Addition =
<=
Less Than or Equal to -
Subtraction +=
Add to Existing Value
>
Greater Than *
Multiplication -=
Subtract from Existing Value
>=
Greater Than or Equal to /
Division *=
Multiply by Existing Value ==
Equal to %
Modulus (Remainder)
Divide by Existing Value !=
Not Equal to %=
Add Remainder to Existing Value
First bullet point here
Second bullet point here
Third bullet point here