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CS 159, Chs 5 - 7 (What was covered for Midterm 2)

by: Constanza Fernandez

CS 159, Chs 5 - 7 (What was covered for Midterm 2) CS 15900

Marketplace > Purdue University > ComputerScienence > CS 15900 > CS 159 Chs 5 7 What was covered for Midterm 2
Constanza Fernandez

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About this Document

These notes cover everything from the book chapters 5 - 7 and also include lecture notes for all of these chapters.
Programming Applications For Engineers
Alan Robert Bunning
Study Guide
CS, CS159, CS15900, programming, ComputerScience, Computer Science, Introduction to C Programming Language, C Programming Language, CS 15900, CS 159
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This 3 page Study Guide was uploaded by Constanza Fernandez on Wednesday April 20, 2016. The Study Guide belongs to CS 15900 at Purdue University taught by Alan Robert Bunning in Spring 2016. Since its upload, it has received 230 views. For similar materials see Programming Applications For Engineers in ComputerScienence at Purdue University.

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Date Created: 04/20/16
Study Guide: CS Exam 2 Logical data: true 1, false 0 Logical and comparison operators: Positive expressions are preferred Do what makes most sense to you De Morgan’s Rule: to negate an expression, apply the not operator to each operand and switch and/or operators && Short circuit logic: if the 1 st expression is false, 2 nd is not st evaluated (use expression most likely to be false 1 ) st nd || Short circuit logic: if the 1 expression is true, 2 is not evaluated (use expression most likely to be true 1 ) st Selection statements When + than 1 statement One-way selection: if statement (nothing happens if false) after if/else, use {} Two-way selection: if…else statement -Block of statements- Multi-way selection: if…else if statement, switch statement If the else condition is not required/null statement: rewrite condition Nested if statements: use && operator Dangling else problem: since spacing is ignored by the Conditional expressions: 3 operands, 2 operators compiler, else is paired with most recent unpaired if expression ? expression1 : expression 2 Conditional expressions can also be nested, but should be avoided. Switch statement: control expression evaluates to multiple alternatives When the expression matches one of the constants, it Default: didn’t match executes from that point to any other the end unless you use “break” Character test functions: Repetition: series of instructions several times/iterations (executions). Looping: repeat instruction until terminating condition is reached.  Initialization: assign beginning values to variables before loop begins  Control expression: determines whether the body of the loop is to be executed  Control variable: regulates the number of times a loop is executed  Loop updating: process which changes something in the loop – will cause the loop to terminate Infinite loop: repeats endlessly (has no terminating condition or it isn’t reached. Interrupt it: CTRL-C Pre-test loop: control expression checked before loop is executed, body may never be executed (while or for) Post-test loop: control expression checked after loop is executed, body executed at least once (do…while) 1. While statement: most common, body executed when condition remains true. 2. For statement: loop choice executed for a finite number of iterations. Use ONLY with counter controlled processes, make use of all 3 expressions with every for loop 3. Do…while statement: executes body at least once, use for input validation Input validation:  Use function to collect user’s input & return it as single value  Provide user with unlimited opportunities  Do not validate for particular data types  Display error message when user makes a mistake Do not use: Don’t use 1. Goto statement: jump from one location to another in a break or comma program, may produce unpredictable results & violates operator rules 2. Break statement: jumps to the end of a control statement 3. Continue statement: jumpts to beginning of control statement 4. Comma expressions: multiple expressions separated by commas 5. Recursion: function calls itself to solve smaller part of same problem Big-O Notation Standard input/output: Scanf – stdin, Printf - stdout Using files in a program when:  So much output it scrolls off screen  Too much data to be typed  Don’t want to type anymore


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