CS 160 Introduction to Computer Science Who are

CS 160 Introduction to Computer Science

Who are we Instructor Tu N. Nguyen, Ph. D. Assistant Professor Department of Computer Science Purdue University, Fort Wayne Office: ETCS 215 H Phone: (260) 481 -6343 Email: nguyent@pfw. edu URL: https: //users. pfw. edu/nguyent/

Who are we Teaching assistant Sanjeev Khemani Email: khemsd 01@pfw. edu

Class information • Class website: https: //users. pfw. edu/nguyent/teaching/fall 20/cs 160/ • Class Brightspace (for submission only) • Announcement Page – Check the web page periodically • Tentative schedule (the schedule is subject to change 24 hours in advance with an announcement). – Will be updated via website: • Help Hot Line: nguyent@pfw. edu

Course Requirements • Syllabus

What we are doing here?

Communication

Human & computer

Why Program? ■ ■ Computers can do countless things How? They are programmable! They are used in nearly every industry Computer programming is an art and a science

What is a Program? ■ Computers follow instructions ■ A computer program is a set of instructions ■ We need to learn its language to properly instruct it! ■ There are many, but we will use Java

Programming Languages • High level programming languages followed that were not processor dependent. • Some common programming languages: Java C Visual Basic BASIC C++ Python COBOL C# Ruby Pascal PHP Java. Script

Development Process

Running Your Code ■ Integrated Developer Environments (IDEs) give you everything you need! – Text editor – Debugger – Other handy features ■ We will use Eclipse in class and in lab – Netbeans or Intelli. J is fine too ■ This class won’t use command line → wait for C and Unix!

Compiler ■ A compiler is a program that translates source code into an executable form. ■ Syntax errors that may be in the program will be discovered during compilation. – These violate a language’s rules – Errors prevent compilation, so code will not run! ■ Average compilers: source code → executables, machine code ■ Java uses. byte files with byte code instead, for the sake of Portability

The Java Virtual Machine ■ Java byte codes are same on all computers. Java code is highly portable as a result! ■ JVMs exist on many platforms: • Windows • Mac • Linux • Uni x • BS D • Etc.

Portability ⦿ We use the Java Development Kit, JDK, from http: //java. sun. com

Parts of a Java Program ■ Example program:

Live Demo ■ JDK ■ Eclipse

Programming Languages What is an algorithm? ■ An algorithm is a set of well defined steps used to complete a task. ■ The steps in an algorithm are performed sequentially. ■ Programmers take abstract algorithms and write them in code the computer can understand!

Algorithm Example ■ The number of hours you worked is 8 ■ The pay rate per hour is 25. 00 ■ How would you calculate your total pay?

This is how! Pay = 8 * 25

This is how in Java!