Computer Programming 1 Introduction

1. Introduction to
Computer Programming
Lesson 1
NEIL A. MUTIA, MIT

2. What is Computer Programming?
 Programming is giving a set of instructions to a computer to
execute a specific task.
 Programming is the process of taking an algorithm and
encoding it into a notation, a programming language, so
that it can be executed by a computer.
 Programming is the mental process of thinking up
instructions to give to a machine (like a computer).

3. What is Computer Programming?
 Analogy of Computer Programming
If you’ve ever cooked using a recipe before, you can think
of yourself as the computer and the recipe’s author as a
programmer. The recipe author provides you with a set of
instructions which you read and then follow. The more
complex the instructions, the more complex the result!

4. What is Computer Programming?
 Procedures when cooking the Adobo

5. Computer Programming Terminologies
 Computer Programmer -The person who created a computer program.
 Computer Program - The set of instructions given to the computer to be
executed. Also known as Algorithm.
 Codes - Each line of instruction inside the computer program
 Programming Language - is a vocabulary and set of grammatical rules for
instructing a computer or computing device to perform specific tasks.
 Example: Java, C++, C, Ruby, Python, etc.
 Compiler - a special program that processes statements written in a
particular programming language and turns them into machine language or
"code" that a computer's processor uses.
 Bugs – Computer Program Errors.
 Text Editor – Software application used by programmers to write computer
programs

6. Computer Programming Terminologies
 Debugging – finding the errors in the program
 Compiling – telling the computer to convert the codes to machine
language.
 Run or Execute the program – telling the computer to perform what is the
intended task of the program
 Syntax - refers to the rules that define the structure of a language.

7. Computer Programming Products
 Calculator
 Smartphones
 Smart TV
 Point of Sale System
 Websites
 Phone Applications
 Automatic/High Tech Cars
 Computer Programs
 Computer boxes in vehicles/motorcycles
 Satellites
 And many more..

8. Computer Programming Sample Salary

9. The Java Virtual Machine
 Machine language consists of very simple instructions that can be executed
directly by the CPU of a computer.
 Almost all programs, though, are written in high-level programming
languages such as Java, Pascal, or C++.
 A program written in a high-level language cannot be run directly on any
computer.
 It has to be translated into machine language. This translation can be done
by a program called a compiler.
 Once the translation is done, the machine-language program can be run
any number of times, but of course it can only be run on one type of
computer.
 If the program is to run on another type of computer it has to be re-
translated, using a different compiler, into the appropriate machine
language.

10. The Java Virtual Machine
 There is an alternative to compiling a high-level language program.
Instead of using a compiler, which translates the program all at once,
you can use an interpreter, which translates it instruction-by-
instruction, as necessary.
 The designers of Java chose to use a combination of compilation and
interpretation.
 Programs written in Java are compiled into machine language, but it is
a machine language for a computer that doesn’t really exist. This so-
called “virtual” computer is known as the Java virtual machine.
 The machine language for the Java virtual machine is called Java
bytecode.

11. The Java Virtual Machine

12. Fundamental Building Blocks of Programs
 There are two basic aspects of programming: data and
instructions.
 To work with data, you need to understand variables and
types.
 A variable is just a memory location (or several locations treated as
a unit) that has been given a name so that it can be easily referred to
and used in a program.
 a variable has a type that indicates what sort of data it can hold.
Examples of variable types
Integers – hold whole numbers (positive and negative numbers) ( -2, -1, 0,
1, 2)
Double - holds a real or decimal based number. (-2, 5, 2.5, 0.33)
Character – holds only one character ( A, c, Z, -, ! )
String – holds multiple characters. ( words or phrase or sentences )

13. Fundamental Building Blocks of Programs
 To work with instructions, you need to understand control
structures and subroutines
 Control structures are special instructions that can
change the flow of control.
 There are two basic types of control structure:
 Loops, which allow a sequence of instructions to be repeated over
and over, and
 Branches (Conditions), which allow the computer to decide
between two or more different courses of action by testing
conditions that occur as the program is running.

14. Program Example

15. Beginners for Programming Must Learn
the following:
 Flowcharts - A flowchart is a diagrammatic representation of an algorithm.
A flowchart can be helpful for both writing programs and explaining
the program to others.

16. Beginners for Programming Must Learn
the following:
 Pseudocode - In computer field, pseudocode is a plain language description of
the steps in an algorithm or another system
 Pseudocode example:
 Start
 Input numbers for variable a & b
 Get the sum of a & b
 Print the sum
 End

17. Beginners for Programming Must Learn
the following:
 Entry Level Programs – a simple programs that execute simple process.

18. Things needed to perform programming
 The Java Virtual Environment – enables the java program to run/execute un a
computer. JDK installer is needed and must be installed in a computer
 Text Editor – enables the programmer to types the codes.

19. Assignment 1
 Create an essay about what you understand from this discussion. You
can discuss each of the topics presented as long as it is from your
own words. Discussion must be at least 300 words. Send directly your
essay to me using Facebook Messenger. Please observe correct
spellings and grammars. Thank you.