1. Introduction to Computing Dr. Nadeem A Khan

2. Lecture 9

3. Built-in Functions (Contd.) Fixed length string formatting: Fixed length string formatting: ► FunctionString Value Format$(1234567890, “@@@@@@@@@@”)? Format$(123, “@@@@@@@@@@”)? Format$(“1234.56”, “@@@@@@@@@@”)? Format$(“$1,234.56”, “@@@@@@@@@@”)? Format$(1/4, “@@@@@@@@@@”)?

4. Sub Text1_KeyPress(KeyAscii as Integer) statements statements End Sub ► Text1_KeyPress event will occur when Text1 has the focus and a key is pressed Text1 has the focus and a key is pressed The Keypress Event Procedure

5. Sub Text1_KeyPress(KeyAscii as Integer) statements statements End Sub ► Keyascii  is a variable (of type Integer)  gets the ANSI value of the pressed key  value is used to display the corresponding character in the Text1 at the end of this procedure The Keypress Event Procedure (Contd.)

6. The ANSI (ASCII) Code ► A 7 bit code representing one of the 95 characters (including space) ► Normally one byte is used to store this code

7. What will happen in these cases? Sub Text1_KeyPress(KeyAscii as Integer) Let KeyAscii =65 Let KeyAscii =65 End Sub Sub Text1_KeyPress(KeyAscii as Integer) Let KeyAscii =0 Let KeyAscii =0 End Sub The Keypress Event Procedure (Contd.)

8. Generating Random Numbers The function: Rnd The function: Rnd ► Generates a random number from 0 up to but not including 1 Picture1.Print Rnd‘print a different number each time Let numvar= Rnd‘a random value is assigned

9. Generating Random Numbers (Contd.) The function: Rnd The function: Rnd Display numbers from the set {1,2,3,4,5,6} randomly!

10. Generating Random Numbers (Contd.) The statement: Randomize Timer? The statement: Randomize Timer?

11. Generating Random Numbers (Contd.) The statement: Randomize Timer The statement: Randomize Timer Sub Command1_Click ( ) Rem Display a lottery number Picture1.Cls Randomize Timer Picture1.Print Int(10*Rnd); Picture1.Print Int(10*Rnd) End Sub

12. Read Chapter 4 completely