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Section 1 Introduction

Section 1 Introduction. National 4/5 VB Course. What you should know after this lesson. What is a program Who writes programs Why is sequence important in programs. Programming. A program is a list of instructions that tell the computer what to do. A programmer writes the programs

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Section 1 Introduction

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  1. Section 1Introduction National 4/5 VB Course

  2. What you should know after this lesson • What is a program • Who writes programs • Why is sequence important in programs

  3. Programming • A program is a list of instructions that tell the computer what to do. • A programmer writes the programs • A user uses the programs You will be both programmer and user in this topic.

  4. What is VB • Visual Basic (VB) is a programming language that derived from BASIC – a general purpose programming language for beginners. Beginners All Purpose Symbolic Instruction Code. It’s aim was to create code to solve general types of problems.

  5. Getting Started – Sample Program Launch VB • We want to try running a VB program. • Drag the Sample folder from the PupilArea > Computing > Comp Science > VB folder into your VB folder • From the folder double click Sample.vbp (icon with the red line) and press run ► • Experiment with the program, what can it do?

  6. Sample Program • The sample program uses code to make objects visible/invisible • Has a This is how we join the program blocks together, you can unsnap a single or bunch of blocks by dragging them.

  7. Drawing • If we keep double clicking on the blocks you should notice the cat moves in a circular fashion. • Drag the “pen down” block from the pen tab, to the top of the program What happens when you keep double clicking it?

  8. Drawing a square • I don’t want to double click the block every time to draw a side of the square, I would rather double click it once and have it draw the square for me. • How can I change the program to make this happen? Hint on next page

  9. Drawing a Square 100 90 90 100 100 90 90 100

  10. Tasks • Create a program to draw a square. • Copy the diagram from the previous slide into your jotter. • Write the program to draw a square into your jotter.

  11. Adding a new Sprite • Sometimes it is nice to have more than one sprite on the screen. • Get a new surprise sprite • Write a program to draw a triangle using the new sprite. • Hint: the angle is 120

  12. All at once • Wouldn’t be easier if there was a start button? • Well there is go to the control tab and drag “when flag clicked” to the top of each of your sprite’s program. • Now when you click on the flag (top right) your program will run

  13. Review Question Write the question & answers in your jotter • What is a program? • Who writes programs? • Why is sequence important in programs?

  14. Extension Tasks Modify your program to draw the following shapes • A hexagon • A pentagon • A circle • A star

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