EKT150 Introduction to Computer Programming. Wk1-Introduction to Computer and Computer Program

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1 EKT150 Introduction to Computer Programming Wk1-Introduction to Computer and Computer Program

2 A Brief Look At Computer Computer is a device that receives input, stores and processes data, and provides output in a useful format. Computers process data according to sets of instructions called computer programs Example: laptops, PCs, mainframes, even everyday objects such as mobile phones, washing-machines, TV sets, cars contain computers Hardware Physical components of a computer Example: Keyboard, screen, mouse, disks, memory, CD-ROM, and processing units Software Programs that run on a computer Example: Operating System such as windows XP -Vista -7, Word processing packages such as MS Word, registration program

3 Computer Hardware

4 Exercise : Distinguishing between input-process-output-storage The scenario: At the end of each month, a clerk enters the employee name, number of days present and absent, and the number of overtime done in the system. The system then calculates the normal salary, the amount for overtime and the total salary. The clerk then saves the information in the computer hard disk, and takes a backup on a cd. A report is produced for the clerk so that the latter can show to the manager. Task: Identify the following for that particular system Input: the employee name, number of days present and absent, the number of overtime Process(es): calculate normal income, calculate amount for overtime, calculate total salary Output: Report Storage: Harddisk, CD-ROM

5 How Computer Processes Information Computers are NOT intelligent Computers do what we tell them to do they don t do anything by themselves. We must clearly tell a computer what to do in a step by step manner using a programming language. Computers only understand electronic High voltage/low voltage The machine language Machine language is binary (two values: high/low) 1 s and 0 s

6 Why we use computer Computers produce fast, accurate and reliable results. While computers do the boring, repetitive, ordinary tasks, we can spend our efforts and time to work on more interesting and creative tasks. The use of computers in business and manufacturing decreases the cost of goods and services produced. It is more difficult and needs more time to find or grow up a skill-full labour in IT industry, while buying an additional computer and installing the required software on is easier and cheaper.

7 Programming / Program / Programmer Programming in general term is planning or implementation of a task or event command. In the computing field, is instructing a computer to perform specific tasks. Computer programming can be defined as the process of planning a set of sequence commands to be executed by a computer. Program be defined as a set of sequence commands that have been determined to be executed by a computer. Computers are just electronic devices that have the power to perform difficult tasks but they do not KNOW what to do therefore - programmers tell the computers what to do by writing programs

8 Types of Programming Machine language languages Strings of numbers giving machine specific instructions Example: , , Assembly language English-like abbreviations representing elementary computer operations (translated via assemblers) Example: LOAD BASEPAY ADD OVERPAY STORE GROSSPAY High level language Codes similar to everyday English. Use mathematical notations (translated via compilers) Example Code: grosspay = basepay + overtimepay Example high level languages: C, C++, Cobol, Java, Pascal (Delphi), Basic (Visual Basic) Fortran, SQL, T- SQL, C#

9 Programming Problem Problem that can be solve using programming language. Suppose you want to add 34 and 56, this is easy. But to add 100 numbers is difficult for us need to use calculator or paper and pencil. Or we can write a program for computer to help us. Can these problems solve by computer programming? Converting units from kilograms to grams. Counting the number of cars on a highway. Finding a life partner Total rain in a week How long we live What we want to eat for dinner

10 Use of programs to solve problems

11 Data, Information and Knowledge Data are the raw facts, gathered from the environment which does not have much meaning. Note: Data is plural, singular form is Datum. Information is the end product of the processing of data, which has more meaning, and is used in decision making. Knowledge is the proved and generalized form of information, that is used in strategic planning.

12 Properties of Well Designed Programs Well designed programs must be: Correct and accurate Easy to understand Easy to maintain and update Efficient - Reliable can be rely on Flexible easily adapt in other situation / problem Correct and accurate Easy to understa nd Easy to maintain and update Efficient Reliable Flexible

13 Steps involve in programming (Planning) Requirement Specification: Eliminate ambiguities, Clearly understand the problem Analyze the problem: Understand the inputs, outputs and processes used for manipulating the data, formulas and constraints Design: Write the algorithm (flowchart or pseudocode) to represent the solution Testing and verification: Check the algorithm. Implement the algorithm: Write a program Testing and Verification: Check the program Documentation

14 Algorithm An algorithm is the plan for writing a program. Steps required for solving a problem are listed by using an algorithm tool. Algorithm tools make program solutions more clear, more understandable, and easier to remember. Algorithms are written according to rules so that other programmers are also able to read and understand the solution easily.

15 Tools of Algorithm There are many Algorithm tools in use, but the most popular ones are Pseudo-Codes and Flowcharts. In this course for all problems we will use both of these tools but in general you choose only one.

16 Example flowchart / pseudo-code Pseudocode 1. Insert key 2. Free the gear 3. Turn on to starting position 4. IF (engine starts in 6 sec) 4.1 YES go to step NO IF (> 5 times) YES call workshop go to step NO go to step 3 5. Release the key 6. End

17 Structured Programming All programs can be written using three control structures Sequence One statement is executed after another Selection A statement is executed or skipped depending on whether a condition evaluates to TRUE or FALSE. Example: if, switch Repetition Statements are executed repeatedly until a condition evaluates to TRUE or FALSE. Example: while, for

18 Flowchart Flowcharts are graphical tools, containing a set of shapes, each expressing a different action in a sequence of program execution. There are many different shapes that are used for specific purposes, to avoid complexity, in this course, only a limited subset of these shapes will be shown and used in applications.

19 Flowchart Shapes Terminal Input Display Process Decision Connector Predefined Process Indicates the starting or ending of the program Used for data entry from keyboard. Use display on screen Indicates any type of internal operation inside the Processor or Memory (STORE INFORMATION & DO CALCULATIONS -variables) Used to ask a question that can be answered in a binary format (Yes/No, True/False) Allows the flowchart to be drawn without intersecting lines or without a reverse flow. Used to invoke a subroutine or an interrupt program.

20 Flowchart: Sequence/Selection/Repetition

21 Example: Using Connectors

22 Pseudo-code Pseudo-code is structured english that is used as an alternative method to flowcharts for planning structured programs. There are no general accepted standards for pseudocodes. We will work with a form that has minimum number of rules and is essentially language-independent. Pseudo-code instructions are written in English, they can be easily understood and reviewed by users. The only syntax rules to be concerned with involve the LOOP and SELECTION structures. They must be used as CAPITALISED words.

23 Pseudo-Code Constructs Assignment: Set num1 to 1 Num1 =1 Computation Input You can use either one of these assignment statements. We prefer the second one Use all arithmetic operators: addition (+), subtraction (-). Division (/), multiplication (*), modulus (%) Input : to enter from the keyboard Read : to read from a file Output Display : to display on screen Print : to print on the printer Selection IF.. END IF IF.. ELSE END IF IF.. ELSE IF.. ELSE END IF SWITCH.. CASE Repetition Repeat... Until (condition) While (condition) Begin : End For (condition) Begin : End

24 Example 1 Write an algorithm that will ask user to input a number then your design will calculate and display the square of input number:

25 Example 2 Write an algorithm that will ask user to input 10 students' marks and calculate the average students' mark and display all ten marks and the average students' mark:

26 Exercise Write an algorithm that will ask user to input height in meters then your design will convert and display the cm value of input number Write an algorithm to input a student's mark and determine the student's grade. Use table below to determine the grade B Grade >=90 A B C D < 60 E

27 References Yuksel Uckan, Problem Solving Using C,Structured Programming Techniques, McGraw-Hill Deitel and Deitel, C: How to Program, McGraw-Hill Cheng, H., C for Engineers and Scientists, McGraw Hill, Hanly, J.R. and Koffman, E.B., C Program Design for Engineers, 2 nd Ed., Addison-Wesley, ISBN :

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