Software Development Techniques - Topic 01

2,338 views
2,268 views

Published on

Published in: Technology
0 Comments
2 Likes
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total views
2,338
On SlideShare
0
From Embeds
0
Number of Embeds
1,237
Actions
Shares
0
Downloads
149
Comments
0
Likes
2
Embeds 0
No embeds

No notes for slide

Software Development Techniques - Topic 01

  1. 1. Topic 1 : Introduction to Module Er. Pradip Kharbuja
  2. 2. What will you learn? 1. Software Development Concept 2. Pseudo code 3. Flowchart 4. Algorithm 5. Data Representation 6. Desk Checking Compiled By: Er. Pradip Kharbuja
  3. 3. What will you learn? (Contd.) 7. Iteration 8. Selection 9. Functions 10.Array 11.Objects & Classes 12.Data Structures 13.Testing and Debugging Compiled By: Er. Pradip Kharbuja
  4. 4. Terminologies 1. Input 2. Output 3. Pseudo Code 4. Flowchart 5. Algorithm Compiled By: Er. Pradip Kharbuja
  5. 5. Terminologies 1. Input  The process of bringing information into a computer program  This may be from the user, or from another source such as a file 2. Output  Displaying or storing information outside the computer program  To the screen, or perhaps to another location or to store in file. Compiled By: Er. Pradip Kharbuja
  6. 6. Terminologies 3. Algorithm A method or logic or some calculations or step-by-step procedure to solve the given problem. An algorithm is procedure consisting of a finite set of unambiguous rules (instructions) which specify a finite sequence of operations that provides the solution to a problem. Compiled By: Er. Pradip Kharbuja
  7. 7. Terminologies 4. Pseudo Code It’s not real programming code, but it helps to write the real code. Pseudo code is a way to describe the algorithm in order to transform the algorithm into real source code. We write it before we write computer code because it allows us to ensure that the logic is correct. Compiled By: Er. Pradip Kharbuja
  8. 8. Terminologies 5. Flowchart • A flowchart is a type of diagram that represents an algorithm or process. • The diagrammatic representation illustrates a solution to a given problem. Compiled By: Er. Pradip Kharbuja
  9. 9. Symbols used in Flowchart Compiled By: Er. Pradip Kharbuja
  10. 10. Terminologies 1. Assembler 2. Compiler 3. Interpreter 4. Compilation 5. Execution 6. High Level Language 7. Low Level Language Compiled By: Er. Pradip Kharbuja
  11. 11. Write down the following words. • Software Development Techniques Compiled By: Er. Pradip Kharbuja
  12. 12. You wrote…. How? Did I tell you to write with pen? Did I tell you to write on copy? Also did I tell to open your pen’s cap before you write? But you did, because you are intelligent. But computer is stupid. Compiled By: Er. Pradip Kharbuja
  13. 13. Computer Programming • Computers are very stupid. • All they know how to do is add. • They don’t know how to deal with ambiguity. • Pick up the thing and put it on the other thing. • They are extremely obedient. • And that’s not always a good thing. • They can’t fill in the blanks. • You need to tell them everything. • This makes giving instructions to a computer very tricky. Compiled By: Er. Pradip Kharbuja
  14. 14. Computer Programming (Contd.) • At its simplest, you can think of a computer program as a list of sequential instructions. • Buying a copy : Go out of the home Go to the stationery shop Ask for copy Select copy Pay for copy Take copy home Compiled By: Er. Pradip Kharbuja
  15. 15. Computer Programming (Contd.) • Computers don’t understand English. • They only know 1 and 0. • We usually don’t speak 1 and 0. • Although, people did once in order to program computers. • It is known Machine Level Programming Language or Low Level Programming Language Compiled By: Er. Pradip Kharbuja
  16. 16. Computer Programming (Contd.) • To simplify the task of giving instructions to a computer, programming languages were created. • We write things in a language that’s semi-understandable to us. • The collection of instructions that are to be given to a computer are known as code. • The rules that govern how a computer program must be put together are called its syntax. Compiled By: Er. Pradip Kharbuja
  17. 17. Computer Programming (Contd.) • So... what is a computer program? • It’s the collection of instructions and information that work together to make the computer do something. • Programs are made up of algorithms and data. • An algorithm is a fixed set of operations that is performed (usually) on data. • Data are the raw facts that the computer program holds. Compiled By: Er. Pradip Kharbuja
  18. 18. The History of Software Development • In the beginning, computer programs were written as 1s and 0s. • This programming language was known as machine code or Machine Level Programming Language or Low Level Programming Language. • Every different kind of computer had its own machine code. • So, machine code were machine dependent. Compiled By: Er. Pradip Kharbuja
  19. 19. The History of Software Development • Machine code was difficult for humans to work with. Too much to remember Too hard to see mistakes Too difficult to change programs once they had been written Too low level for people to write well Compiled By: Er. Pradip Kharbuja
  20. 20. The History of Software Development • A new kind of programming language, called assembly language, was introduced to make writing machine code easier. • It is also low level programming language. • Assembly language used (almost) human readable words to represent collections of 1s and 0s. • Machine code might need you to write 10110000 01100001 • Assembly language meant all you had to write was MOV AL, 61h Compiled By: Er. Pradip Kharbuja
  21. 21. The History of Software Development • The computer itself doesn't understand assembly language. • It is needed to be converted into machine code. • This was done through a process called assembling and done by Assembler. • Every computer has its own version of assembler. • If you learned how to write code on one computer, you needed to learn a new version of assembler to write code on another – Machine Dependent. Compiled By: Er. Pradip Kharbuja
  22. 22. The History of Software Development • Assembly language still wasn’t easy to write program code with. • Disadvantages of Low level Programming Language 1. Very hard to read or learn. 2. Harder to modify and maintain. 3. Machine dependent or not portable across different devices. Compiled By: Er. Pradip Kharbuja
  23. 23. The History of Software Development High Level Programming Language • easier to read, write, and maintain • generally machine independent • makes the process of developing a program simpler and more understandable • Example : C, Ada, BASIC, COBOL, C++, FORTRAN, LISP, Pascal, Java, PHP, C#.NET Compiled By: Er. Pradip Kharbuja
  24. 24. The History of Software Development High Level Programming Language • The most popular of these was a language called C. It’s still used even today. • C code was human readable and worked (mostly) across lots of different computers. • C => C++ => Java Compiled By: Er. Pradip Kharbuja
  25. 25. Terminologies • A compiler is a computer program that transforms source code written in a high level programming language into machine code. • This process is called Compilation. • You need to compile only once unless any source code is modified • Once a program has been compiled, it is now ready to execute. • Execution is the process of loading the program into the computer’s memory. • This is also known as running a program. Compiled By: Er. Pradip Kharbuja
  26. 26. Assembling and Execution • A. L. Program = Assembly Level Program Compiled By: Er. Pradip Kharbuja A. L. Program A. L. Program A. L. Program Machine Code Machine Code Machine Code System 1 System 2 System 3 Assembling Execution
  27. 27. Compilation and Execution Compiled By: Er. Pradip Kharbuja Machine Code Machine Code Machine Code System 1 System 2 System 3 Compilation Execution High Level Program Code
  28. 28. How to Write A Program • First, decide what information you are going to need to store. This is data representation • Decide how you are going to get that information. This is known as input • Decide how you are going to manipulate that information. This is your algorithm. • Decide how you are going to display that information. This is known as output. Compiled By: Er. Pradip Kharbuja
  29. 29. Task : Print Hello World 1. Problem Identifying 2. Requirement Analysis 3. Program Design a. Pseudo Code b. Flowchart c. Source Code 4. Output Compiled By: Er. Pradip Kharbuja
  30. 30. 1. Problem Identifying • Displaying “Hello World” Text Compiled By: Er. Pradip Kharbuja
  31. 31. 2. Requirement Analysis Output Hello World Compiled By: Er. Pradip Kharbuja
  32. 32. 3. Program Design a. Pseudo Code • Start • Output “Hello World” • Stop Compiled By: Er. Pradip Kharbuja
  33. 33. 3. Program Design b. Flowchart Stop Start Output "Hello World" Compiled By: Er. Pradip Kharbuja
  34. 34. 3. Program Design c. Source Code • - We will do it in programming language : Java / C / C++ / Visual Basic Compiled By: Er. Pradip Kharbuja
  35. 35. 4. Output • - Output must be shown at 3 times a. Negative Input b. Normal Input c. High Input - Current Pseudo Code Output a. Hello World b. Hello World c. Hello World Compiled By: Er. Pradip Kharbuja
  36. 36. Task #1 Input your name and display. • You must display text “Enter your name : ” • You must display text “Your name is : ” Compiled By: Er. Pradip Kharbuja
  37. 37. What you have to do? 1. Problem Identifying 2. Requirement Analysis 3. Program Design a. Pseudo Code b. Flowchart c. Source Code 4. Output Compiled By: Er. Pradip Kharbuja
  38. 38. Task #1 1. Problem Identifying • Take user input with displaying text • Display result with certain text 2. Requirement Analysis Input Output Enter your name : n1 Your name is : n1 Compiled By: Er. Pradip Kharbuja
  39. 39. Task #1 3. Program Design a. Pseudo Code Start Output “Enter your name : “ Input n1 Output “Your name is : ” Output n1 Stop Compiled By: Er. Pradip Kharbuja
  40. 40. Task #1 3. Program Design b. Flowchart Stop Start Output “Enter your name : " Input n1 Output n1 Compiled By: Er. Pradip Kharbuja Output “Your name Is “
  41. 41. Task #1 4. Output  Output 1 • Enter your name : David • Your name is : David  Output 2 • Enter your name : 124 • Your name is : 124  Output 3 • Enter your name : • Your name is : Compiled By: Er. Pradip Kharbuja
  42. 42. Task #2 Now take 2 numbers and display them. • You must display text  Enter 1st number :  Enter 2nd number :  The 1st number :  The 2nd number : Compiled By: Er. Pradip Kharbuja
  43. 43. Task #3 Take following inputs and display them: 1. First Name 2. Last Name 3. Address 4. Phone Number 5. Age Compiled By: Er. Pradip Kharbuja
  44. 44. Task #4 Take 2 inputs from user and add them. Compiled By: Er. Pradip Kharbuja
  45. 45. Task #4 1. Problem Identifying • Take 2 user inputs • Sum them • Display the result 2. Requirement Analysis Input Process Output n1 n2 n3 = n1 + n2 n3 Compiled By: Er. Pradip Kharbuja
  46. 46. Task #4 3. Program Design a. Pseudo Code Start Input n1 Input n2 n3 = n1 + n2 Output “The sum is : ” + n3 Stop Compiled By: Er. Pradip Kharbuja
  47. 47. Task #4 3. Program Design b. Flowchart Stop Start Input n1 Output “The sum is : “ + n3 Input n2 n3 = n1 + n2 Compiled By: Er. Pradip Kharbuja
  48. 48. Task #4 4. Output  Output 1 (with Negative Input) -5 -20 The sum is -25  Output 2 (with Normal Input) 10 20 The sum is 30  Output 3 (with High Input) 3000 4000 The sum is 7000 Compiled By: Er. Pradip Kharbuja
  49. 49. Assignment #1 1. Program demonstrating sum, subtraction, multiplication, division 2. Averaging five ages 3. Find the area of rectangle 4. Find the area of circle  Assignment Deadline: 18th August, 2014 before 2:00 PM Compiled By: Er. Pradip Kharbuja
  50. 50. End of Topic - 1 Compiled By: Er. Pradip Kharbuja

×