1. Variables and Math in Code

2. Variables A variable is a storage block for information in your program “A” 011010 “A” Computer Program Memory Computer Program

3. Types of variables Different types of data require different types of “boxes” (variables). The main variable types we are going to use are: –Integer - for whole numbers eg. 1; 334; -3 –Double(float) – for decimal points eg. 1.2; 34.5 –String – for text or words eg. “hello” “s” –Boolean – for yes/no eg. True/False

4. Example of Variables Have a look at the following code examples: string Myname; Myname = “Bob”; Messagebox.show This would display a message with the text “Bob” in it. Alternatively you could have written: String Myname = Bob; To create and assign a value to the variable in one step. Have a look at the following website for more help on this concept: http://www.java2s.com/Tutorial/CSharp/0020__Language-Basics/Defineandassignvaluetovariables.htm The variable creation The variable assignment Using the variable

5. Maths in Code Maths in code is easy!! Plus = + Minus = - Multiply = * Divide = / Eg. Int mynumber = 1 + 2;

6. An example in code Create a new small program and add a button to the form. Then add the following code: int Number1; int Number2; int myTotal; Number1 = 3; Number2 = 6; myTotal = Number1 + Number2; messagebox.show(myTotal.ToString());

7. Your Turn! With all this new knowledge see if you can make your own simple calculator! (see programming task online…)