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# CS 104 Study Guide for Exam 1 CS 104

UA
GPA 3.8

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This was my study guide for exam 1 in CS 104.
COURSE
Computer science principles
PROF.
Jeffrey gray
TYPE
Study Guide
PAGES
3
WORDS
KARMA
50 ?

## Popular in ComputerScienence

This 3 page Study Guide was uploaded by Julianna Pfadt on Saturday January 23, 2016. The Study Guide belongs to CS 104 at University of Alabama - Tuscaloosa taught by Jeffrey gray in Summer 2015. Since its upload, it has received 47 views. For similar materials see Computer science principles in ComputerScienence at University of Alabama - Tuscaloosa.

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Date Created: 01/23/16
UA CS 104 Computer Sciences Principles (for math majors) Exam 1 Study Guide Important Concepts to Review in the Slides:  Review Ch.1 of Blown to Bits 1. Moore’s Law 2. Metcalfe’s Law 3. Principles of Bits > exponential growth, nothing goes away, technology makes it a “flat world” 4. Very likely that there are transmission errors when messages are sent and they must be resent until the message is received correctly  Odd parity and even parity 1. 1001 even; 1000 odd 2. Used to detect errors > pattern for card game > ERROR CORRECTION  Credit cards and checksums 1. ERROR DETECTION 2. The Luhn Algorithm (*memorize this) Example: 49927398716  Reverse the credit card no. :61789372994  Sum the digits of the odd places: 6+7+9+7+9+4=S1=42  Double, the sum the digits in the even places (if doubled no. is two digits, sum the digits):  1,8,3,2,9 => 2,16,6,4,18 => 2,7,6,4,9  2+7+6+4+9=S2=28  Last digit of sum of S1 and S2 should be 0: 42+28=70  CONFIRMED  Binary Number 1. Long string of 0’s and 1’s  Byte = Binary Term; Bit = Binary Digit 1. 1 Byte = 8 Bits ~ 1 character 2. Subscript of 2 => binary no. 3. Subscript of 10 => decimal no.  Convert binary to decimal and decimal to binary 1. Powers of 2 => 2 , n=0,1,…,n 2. 10101 2 21 (10ltiply down, add across)  Hexadecimal: 1. 0-F: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F 2. Streams of bits converted to hex by 4-bit squeances: 100110110011 3. Color codes are in hexadecimal 4. Each 2-letter hex no. represents 256 values (a byte), or one part of RBG 5. Colors represented in 3 Bytes: red, blue, green  3 bytes in a pixel, each byte represents a color (RBG)  16 million colors!! (1byte*1byte*1byte = 256 ~16 million )  Octal: Base 8  Oct 31 = Dec25 1. “A” in text is represented as decimal 25, which is 31 in octals  Grayscale, red eye removal, color filters  Compression (optimize storage) 1. Lossless vs Lossy Compression 2. White&Black block patterns as compression with RLE  Computation: calculation that involves a process following a well-defined model understood and expressed in an algorithm  Turing Machine 1. Alan Turing > Father of CS 2. Can compute ANY algorithm  Hardware>you can touch it; software>set of instructions that tell the computer what to do (programs)  Compiler, translator, interpreter  Lower level vs. higher level  RAM, ROM, external storage  5 Phases of Software Development: 1. Understand the problem 2. Plan the logic 3. Code the program 4. Test the program 5. Deploy the program, produce, maintain  Types of errors: syntax errors and logical errors  Flowcharts and Pseudocode  Relational operators: <, >, =  Boolean/Logical operators: and, or, not  Loops: forever, repeat, repeat until  Variable swap in programming  Sturctures: sequence, decision, loop  Truth Tables  Broadcasting; and all other important concepts used in Maze Game  Parameter: an additional piece of information provided to the block that helps the block do its function  Procedural Abstraction: using parameters and same code to make code usable for many contexts (abstraction=> hiding the details)  When to Create a New Block 1. When a piece of code becomes very long 2. When code is very repetitive  Types of Blocks 1. Command: method; preforms a given set of instructions (no output) 2. Reporter: function; preforms given set of instructions (gives output) 3. Predicate: Boolean function; (output is True/False)  Validating parameters  Max Block, >= Block, Sum Method, Mystery blocks from quizzes  Storing data in a list, integrating through a list  Practice running through code to find the output and become familiar with Snap!

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