Introduction to Computer Programming CS 126 Lecture 2 Zeke Maier

Plan for Today Questions Administrivia Course Census Results Java Introduction Assignment CEC Accounts

Questions: Jobs Job market is tight right now Google, Microsoft, Boeing, Monsanto… FBI, NSA, smaller firms, start a new company! PositivesNegatives Job SatisfactionActivity $50,000Monotony Still GrowingCeiling

Questions: Job Skills Multitude of languages –.NET, Java, C/C++, Ruby… – HTML, CSS, Javascript, ActionScript/Flash,.NET, Ruby, PHP, Python… – SQL Source Revision Control –Subversion, CVS, GIT Other –Projects, Aptitude, Coding Style, Methodology

Administrivia –Teaching Assistant schedule –Telesis for grades –Calendar updated –AIM account –Assignment cover sheet

Course Census Results

Course Goals “Understand how computers operate to strengthen my everyday interactions” “Gain a basic understanding of programming to evaluate potential future endeavors” Additional Comments “Can I do well without previous programming experience?”

Languages Syntax –Rules of writing structure Semantics –Meaning of what is written class Hello { //My first program! public static void main(String args[]) { system.out.println(“Hello, World!”); }

Programming Languages A language for describing computer computations –High level languages Description: abstraction of low level languages Examples: Java, C++,… –Low level languages Description: 1s and 0s, computer executable Examples: assembly & machine code

High Level Languages: Basic Elements Primitives –Numbers, characters, strings, addition… Means of combination –x=3+4; Means of abstraction –Data abstraction (Facebook profile) Means of capturing common patterns –Inheritance

High to Low Level

Java Object Oriented Programming Language –Programs are a collection of communicating objects Class = type of object Object = instantiation of class Class –Models something… –Consists of: Data members Methods

Program Sequence of instructions which specify a computation –Take in input –Perform operations –Produce output –Testable

Debugging Process of tracking down and correcting bugs –Compile-time errors Syntax –Run-time errors Exceptions –Logic errors Semantic Experimental debugging

Assignment Lab 0 to be done in lab sections today Readings –Friday AD Chapter 1 KG Notes