1. Welcome back to Software Development!

2. STAIR Design Method
STAIR

3. STAIR Design Method
STAIR
State the problem

4. STAIR Design Method
STAIR
State the problem
Tool identification

5. STAIR Design Method STAIR State the problem Tool identification
Algorithm

6. STAIR Design Method STAIR State the problem Tool identification
Algorithm
Implementation

7. STAIR Design Method STAIR State the problem Tool identification
Algorithm
Implementation
Refinement

8. STAIR – Step 1

9. STAIR – Step 1
State the problem

10. STAIR – Step 1
State the problem
Clear and concise

11. STAIR – Step 1 State the problem Clear and concise
Just a sentence (to maybe a paragraph)

12. STAIR – Step 1 State the problem Clear and concise
Just a sentence (to maybe a paragraph)
Indicates what you want to accomplish

13. STAIR – Step 1 State the problem Clear and concise
Just a sentence (to maybe a paragraph)
Indicates what you want to accomplish
As non-technical as possible

14. STAIR – Step 1 State the problem Clear and concise
Just a sentence (to maybe a paragraph)
Indicates what you want to accomplish
As non-technical as possible
Very important!

15. STAIR – Step 1 State the problem Clear and concise
Just a sentence (to maybe a paragraph)
Indicates what you want to accomplish
As non-technical as possible
Very important!
If you can’t simply state what you are supposed to do…

16. STAIR – Step 1 State the problem Clear and concise
Just a sentence (to maybe a paragraph)
Indicates what you want to accomplish
As non-technical as possible
Very important!
If you can’t simply state what you are supposed to do…how can you do it?

17. STAIR – Step 2

18. STAIR – Step 2
Tool identification

19. STAIR – Step 2 Tool identification
The programming “stuff” you think you will need…

20. STAIR – Step 2 Tool identification
The programming “stuff” you think you will need…
Will our program be making decisions?

21. STAIR – Step 2 Tool identification
The programming “stuff” you think you will need…
Will our program be making decisions? (diamonds in the flowchart)

22. STAIR – Step 2 Tool identification
The programming “stuff” you think you will need…
Will our program be making decisions? (diamonds in the flowchart)
Will our program need to loop?

23. STAIR – Step 2 Tool identification
The programming “stuff” you think you will need…
Will our program be making decisions? (diamonds in the flowchart)
Will our program need to loop?
Will I need variables to hold information?

24. STAIR – Step 2 Tool identification
The programming “stuff” you think you will need…
Will our program be making decisions? (diamonds in the flowchart)
Will our program need to loop?
Will I need variables to hold information?
What type of information?

25. STAIR – Step 2 Tool identification
The programming “stuff” you think you will need…
Will our program be making decisions? (diamonds in the flowchart)
Will our program need to loop?
Will I need variables to hold information?
What type of information? (strings, numbers, …)

26. STAIR – Step 2 Tool identification
The programming “stuff” you think you will need…
Will our program be making decisions? (diamonds in the flowchart)
Will our program need to loop?
Will I need variables to hold information?
What type of information? (strings, numbers, …)
How many?

27. STAIR – Step 2 Tool identification
The programming “stuff” you think you will need…
Will our program be making decisions? (diamonds in the flowchart)
Will our program need to loop?
Will I need variables to hold information?
What type of information? (strings, numbers, …)
How many?
For what?

28. STAIR – Step 2 Tool identification
The programming “stuff” you think you will need…
Will our program be making decisions? (diamonds in the flowchart)
Will our program need to loop?
Will I need variables to hold information?
What type of information? (strings, numbers, …)
How many?
For what? (user name, favorite color, …)

29. STAIR – Step 2 Tool identification
The programming “stuff” you think you will need…
Will our program be making decisions? (diamonds in the flowchart)
Will our program need to loop?
Will I need variables to hold information?
What type of information? (strings, numbers, …)
How many?
For what? (user name, favorite color, …)
Will we need anything .NET provides?

30. STAIR – Step 2 Tool identification
The programming “stuff” you think you will need…
Will our program be making decisions? (diamonds in the flowchart)
Will our program need to loop?
Will I need variables to hold information?
What type of information? (strings, numbers, …)
How many?
For what? (user name, favorite color, …)
Will we need anything .NET provides?
Console.ReadLine and/or Console.WriteLine

31. STAIR – Step 2 Tool identification
The programming “stuff” you think you will need…
Will our program be making decisions? (diamonds in the flowchart)
Will our program need to loop?
Will I need variables to hold information?
What type of information? (strings, numbers, …)
How many?
For what? (user name, favorite color, …)
Will we need anything .NET provides?
Console.ReadLine and/or Console.WriteLine
Will we need any algorithms we’ve already written?

32. STAIR – Step 3 cont

33. STAIR – Step 3 cont
Test Plan

34. STAIR – Step 3 cont
Test Plan
Before you write code

35. STAIR – Step 3 cont Test Plan Before you write code
Determine how to tell if your program is doing what it is supposed to

36. STAIR – Step 3 cont Test Plan Before you write code
Determine how to tell if your program is doing what it is supposed to
Think through what may go wrong

37. STAIR – Step 3 cont Test Plan Before you write code
Determine how to tell if your program is doing what it is supposed to
Think through what may go wrong…boundary conditions

38. STAIR – Step 3 cont Test Plan Before you write code
Determine how to tell if your program is doing what it is supposed to
Think through what may go wrong…boundary conditions
Write out a plan:

39. STAIR – Step 3 cont Test Plan Before you write code
Determine how to tell if your program is doing what it is supposed to
Think through what may go wrong…boundary conditions
Write out a plan:
We will look for these things to be working

40. STAIR – Step 3 cont Test Plan Before you write code
Determine how to tell if your program is doing what it is supposed to
Think through what may go wrong…boundary conditions
Write out a plan:
We will look for these things to be working
We will test these bad things to make sure our program still works right

41. STAIR – Step 3 cont Test Plan Before you write code
Determine how to tell if your program is doing what it is supposed to
Think through what may go wrong…boundary conditions
Write out a plan:
We will look for these things to be working
We will test these bad things to make sure our program still works right
Do this before you write code!

42. STAIR – Step 3 cont Test Plan Before you write code
Determine how to tell if your program is doing what it is supposed to
Think through what may go wrong…boundary conditions
Write out a plan:
We will look for these things to be working
We will test these bad things to make sure our program still works right
Do this before you write code!
Play computer

43. STAIR – Step 3 cont Test Plan Before you write code
Determine how to tell if your program is doing what it is supposed to
Think through what may go wrong…boundary conditions
Write out a plan:
We will look for these things to be working
We will test these bad things to make sure our program still works right
Do this before you write code!
Play computer
“Run” your algorithm step-by-step to see if it does what you expect

44. STAIR – Step 4

45. STAIR – Step 4
Implementation

46. STAIR – Step 4
Implementation (using the IDE…Visual Studio 2005)

47. STAIR – Step 4 Implementation (using the IDE…Visual Studio 2005)
This is the first time you are writing code!

48. STAIR – Step 4 Implementation (using the IDE…Visual Studio 2005)
This is the first time you are writing code!
Edit

49. STAIR – Step 4 Implementation (using the IDE…Visual Studio 2005)
This is the first time you are writing code!
Edit
Type in the C# code implementing your algorithms

50. STAIR – Step 4 Implementation (using the IDE…Visual Studio 2005)
This is the first time you are writing code!
Edit
Type in the C# code implementing your algorithms
Compile

51. STAIR – Step 4 Implementation (using the IDE…Visual Studio 2005)
This is the first time you are writing code!
Edit
Type in the C# code implementing your algorithms
Compile
Translate your C# code into machine language

52. STAIR – Step 4 Implementation (using the IDE…Visual Studio 2005)
This is the first time you are writing code!
Edit
Type in the C# code implementing your algorithms
Compile
Translate your C# code into machine language
The compiler will catch any language problems

53. STAIR – Step 4 Implementation (using the IDE…Visual Studio 2005)
This is the first time you are writing code!
Edit
Type in the C# code implementing your algorithms
Compile
Translate your C# code into machine language
The compiler will catch any language problems
Correct error and recompile

54. STAIR – Step 4 Implementation (using the IDE…Visual Studio 2005)
This is the first time you are writing code!
Edit
Type in the C# code implementing your algorithms
Compile
Translate your C# code into machine language
The compiler will catch any language problems
Correct error and recompile
Run the program!

55. STAIR – Step 5

56. STAIR – Step 5
Refinement

57. STAIR – Step 5 Refinement
Rarely will it run correctly the 1st (or 2nd) time

58. STAIR – Step 5 Refinement
Rarely will it run correctly the 1st (or 2nd) time
Two general types of bugs:

59. STAIR – Step 5 Refinement
Rarely will it run correctly the 1st (or 2nd) time
Two general types of bugs:
Crashes

60. STAIR – Step 5 Refinement
Rarely will it run correctly the 1st (or 2nd) time
Two general types of bugs:
Crashes
You will get an error message and the debugger will show you what line of code the error occurred on.

61. STAIR – Step 5 Refinement
Rarely will it run correctly the 1st (or 2nd) time
Two general types of bugs:
Crashes
You will get an error message and the debugger will show you what line of code the error occurred on.
Logic errors

62. STAIR – Step 5 Refinement
Rarely will it run correctly the 1st (or 2nd) time
Two general types of bugs:
Crashes
You will get an error message and the debugger will show you what line of code the error occurred on.
Logic errors
Your algorithm is wrong

63. STAIR – Step 5 Refinement
Rarely will it run correctly the 1st (or 2nd) time
Two general types of bugs:
Crashes
You will get an error message and the debugger will show you what line of code the error occurred on.
Logic errors
Your algorithm is wrong
Program isn’t doing what you really intended

64. STAIR – Step 5 Refinement
Rarely will it run correctly the 1st (or 2nd) time
Two general types of bugs:
Crashes
You will get an error message and the debugger will show you what line of code the error occurred on.
Logic errors
Your algorithm is wrong
Program isn’t doing what you really intended
Remember, the computer does exactly what you tell it to!

65. Clear and Unclear Windows