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### P.Lecture - 2.12.08

Course: EE 312, Spring 2008
School: University of Texas
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Word Count: 1505

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Assignment Announcements 3 out today Assignment 3 and 4 logisitics Exam 1 Thursday 55 minute exam (9:30 10:25) Program Development Measurement g p SLOC, person hours, logic defects Topics for today Topics for today Scope of variables Exam Review Exam Review 1 Global (External) Variables Variables declared outside functions are global External variables can be shared by several (all) functions:...

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Assignment Announcements 3 out today Assignment 3 and 4 logisitics Exam 1 Thursday 55 minute exam (9:30 10:25) Program Development Measurement g p SLOC, person hours, logic defects Topics for today Topics for today Scope of variables Exam Review Exam Review 1 Global (External) Variables Variables declared outside functions are global External variables can be shared by several (all) functions: #include <stdio.h> int i; /* i is a global variable */ void print_count(void) { printf("T minus %d and counting\n", i); } int main(void) { for (i = 10; i > 0; i) { print_count(); } return 0; } E External variables retain their values throughout the execution of the program l i bl i h i l h h h i f h External variables should be used sparingly, if at all If an external variable is assigned an incorrect value, it is difficult to identify the guilty function Functions that use external variables are hard to reuse 2 Local Variables Variables declared inside a function are local to that function Variables declared inside a function are local to that function Example: float max(float a, float b) { float big; / big is a local variable / float big; /* big is a local variable */ if (a > b) { big = a; } else { big = b; } return big; return big; } Local variable exists only when the enclosing function is executing L l Local variable is visible only to statements in the enclosing function i bl i i ibl l i h l i f i Names of local variables can be reused for other purposes in the same program same program 3 Parameters A function header can contain parameter declarations f h d d l void swap( int i, int j) { int temp; int temp; temp = i; i = j; j = temp; j = temp; } A variable declared as a parameter in a function header a ab e dec a ed as a pa a ete a u ct o eade exists only as long as the function is executing It is a local variable It derives its value from the arguments passed at function call time 4 Inside of Blocks A block of statements can contain declarations if (i < j) { int temp; int temp; temp = i; i = j; j = temp; } A variable declared in a block exists only as long as statements in the block are executing y A variable declared in a block is visible only to statements in the block A block can appear anywhere a statement is A block can appear anywhere a statement is allowed 5 Scope Rules When a declaration inside a block (or function) uses an identifier When a declaration inside a block (or function) uses an identifier that is already visible, the new declaration temporarily "hides" the old one At th At the end of the block, the identifier regains its old meaning d f th bl k th id tifi i it ld i int i; /* Declaration 1 global */ void f (int i) { /* Declaration 2 a parameter */ i = 1; i = 1; } void g (void) { int i; ; / /* Declaration 3 a local */ / if (i > 0) { int i; /* Declaration 4 local to block */ i = 2; } Resolution rules: i = 3; } 1. Look for most local void h (void) { void h (void) { 2. Look for a parameter 2 Look for a parameter i = 4; 3. Look for a global } 6 Exam Review 7 Exam Topics I Introduction to C (e.g., strengths, weaknesses) d i C( h k ) Chapter 1 and Lecture 1 Variables and Assignment Variables and Assignment Chapters 2, 4, 7 and Lecture 2 Formatted I/O Chapter 3 and Lecture 3 Control Statements Chapters 5 6 and Lectures 4 5 Chapters 5, 6 and Lectures 4, 5 Arrays Chapter 8 and Lectures 6, 7 p Functions Chapter 9 and Lecture 8 Scope of Variables Chapter 10 and Lecture 9 (today) 8 Requested Review Topics 9 Loops -- two basic patterns Countcontrolled loop: Number of iterations is determined before the loop starts Counts each iteration using a counter variable Counts each iteration using a counter variable Stop when the desired number of iterations has been performed: for (i = 1; i < 100; i++ ) { printf ("the value of i is: %d ",i); } Eventcontrolled loop: Before each iteration, check whether some event has occurred Continue until that event occurs Number of iterations not known beforehand Number of iterations not known beforehand The event signal is in the condition; may change during an iteration. Boolean variable often used to flag the signal: while (condition) { / loop while the condition is true / while (condition) { /* loop while the condition is true */ /* do other stuff */ } while Statement while statement has the form while ( condition ) statement The body is executed repeatedly as long as the condition is true (has a The body is executed repeatedly as long as the condition is true (has a nonzero value) condition is tested before each execution of the body Example: i = 10; /* count down from */ 10 while (i > 0) { while (i > 0) { printf ("T minus %d and counting\n", i); i; } condition F T Using a nonzero constant as the controlling condition creates an infinite loop: while (1) { hil (1) { ... } For loop The for statement has the form for ( expression1 ; expression2 ; expression3 ) statement The following code has the equivalent semantics of the above for The following code has the equivalent semantics of the above for statement: expression1; while (expression2) { hil ( i 2) { statement expression3; } For example for (i = 10; i > 0; i ) { printf("T minus %d and counting\n", i); i tf("T i %d d ti \ " i) } Any or all of the three expressions may be omitted Omitting the middle expression creates an infinite loop. Used for counter controlled loops Tracing Loop Execution 13 Review Exercises 14 Exercises: Fundamentals Consider this program: #include <stdio.h> main( ) { printf("Parkinson's Law:\n Work expands so as to "); printf("fill the time\n"); i tf("fill th ti \ ") printf("available for its completion.\n"); return 0; return 0; } How many directives? What are they? How many directives? What are they? How many statements? What are they? 15 Exercises: Fundamentals Which of the following are keywords in C? for If main printf while 17 Exercises: Fundamentals Write a program that computes the volume of a p g sphere with a 10 meter radius using the formula v = 4/3r3 Output the result Output the result Modify the program to take the radius as an input 19 Exercises: Expressions Write a program that asks the user to enter a g , p twodigit number, then prints the number with its digits reversed. Hint: If n is an integer, n % 10 is the last digit in n Hint: If n is an integer, n % 10 is the last digit in n and n/10 is n with the last digit removed. 21 Exercises: Selection Statements Write a program that determines the number of g p digits in a number input from the user. Assume the number has no more than 4 digits. 23 Exercises: Selection Statements Using a switch statement, write a program that asks the user for a twodigit number, then prints g , p the English word for that number. For example: Enter a two-digit number: 45 two digit You entered the number forty-five. 25 Exercises: Loops Write a program that asks the user to enter two g , p y integers, then calculates and displays their greatest common divisor (GCD): Enter two integers: 12 28 Greatest common divisor: 4 Hint: Use Euclid's algorithm to compute the GCD Hint: Use Euclid s algorithm to compute the GCD Let m and n be variables containing the two numbers. Divide m by n. Save the divisor in m, and numbers Divide m by n Save the divisor in m and save the remainder in n. If n is 0, then stop: m contains the GCD. Otherwise repeat the process, p p starting with the division of m by n. 27 Exercises: Functions Rewrite the previous program to use one or more functions. 29 Exercises: Loops and Functions Write a program that asks the user to enter a , fraction, then converts the fraction to lowest terms (e.g., 6/12 would be converted to 1/2) Hint: to convert a fraction to lowest terms, first Hint: to convert a fraction to lowest terms, first compute the GCD of the numerator and denominator. Then divide both by the GCD. denominator. Then divide both by the GCD. 31 Exercises: Arrays Write a program that reads a 5 x 5 array of g p integers and then prints the row sums and the column sums Enter row 1: 1 Enter row 2: 6 Enter row 3: 1 Enter row 4: 6 Enter row 5: 1 Row totals: 15 Column totals: 2 3 7 8 2 3 7 8 2 3 30 15 4 5 9 0 4 5 9 0 4 5 15 30 15 20 25 30 15 33 Exercises: Functions The following function, which computes the area g , of the triangle, contains two errors. What are they? float triangle_area(float base, height) float product; { p product = base * height; g return (product / 2); } 34 Exercises: Functions Write functions that return the following values ( (assuming a and n are parameters where a is an g p array of int values and n is the (integer) length of the array) y) The largest element in a The average of all elements in a g The number of positive elements in a 35 Exercises: Test-Style Questions Consider the following code segment. What is p the value of the variable x after the for loop? int j, x = 2; for (j = 0; j <= 3; j++) { x = x + j * x; } Hint: trace the execution of the loop 36 Exercises: Test-Style Questions Complete the function below named invertMatrix that takes a 2D array named v y and inverts it. The 2D array v has n x n elements. void invertMatrix (int v[ ][ ], int n) { } 37
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University of Texas - EE - 312
Announcements Assignment 3 Exam 1 Graded Back in recitations on Friday Statistics on Thursday (hopefully) Read Chapters 11,12, 13 and 22 Topics for today Matrices Random numbers Strings (time permitting)Review: 2D Arrays Used for table
University of Texas - EE - 312
Announcements Assignment 2 posted today Assignment 2 posted today Quizzes C Coding Style C C di S l For today: Finish looping control statements (Chap. 6) More on types (Chap. 7)For loop The for statement has the formfor ( expression1 ; exp
University of Texas - EE - 312
E E 312 Notes 2.5Arrays Matrix Int variable [r][c] Int my2Darray [3,3] o That means evaluate 3 for 3 Use for statement and nested loops Allows you to make a change in the rows and columns Scan ( %f, &amp;energy[][]); 2d arrays Not easier for us to do
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EE 312 Notes--------Malloc = sets a memory block for the size of bytes you need o Used as a pointer o Ex: p = malloc(sizeof(int); o Will return null if cannot find size o Make sure to check for null Calloc= allocates space for an ar
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University of Texas - EE - 312
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University of Texas - EE - 312
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University of Texas - EE - 312
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University of Texas - EE - 312
E E 312 Discussion 1.18.2008 Most general computer Consist of a microprocessor o o o Intel x86 Takes instructions Computes a resultProgrammer o o o o o Job is to write instructions to build jobs Use programming language Our language is C Something
University of Texas - EE - 312
Dicussion Session EE 312 1/25/08Printf (&quot; %4d&quot;, 86); Printf(&quot;%06d&quot;, 86); Printf(&quot;%4d&quot;, 10405); shows*/ Printf(&quot;%12.5e, 30.253); Control Statements: If(i&gt;2) J = 100; Else J =-100; Can set Multiple Parameters= = = =|_|_86| |000086| |10405| /* On
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University of Texas - EE - 312
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University of Texas - EE - 312
EE 312 Programming Project #3 Flow Chart Brian Fontenot (BLF339) 15670 F: 11-12Start programdeclare variablesdeclare arrayIntialize arrayIntialize variablesprompt user informationscan for user inputread user inputsort out prime num
University of Texas - EE - 312
10 299 492 495 399 492 495 399 283 279 689 078 100 000 000 000 456 789 234 453 125 175 183 256 012 100 000 212 415 521 721 532 439 543 631 339 923 029 873 674 027 023 610 621 632 643 654 665 676 687698 609 201 805 229 429 100 100 456 789 234 453 12
University of Texas - EE - 312
EE312 Introduction to Programming I d i P iSpring 2008 Christine Julien Christine Julien Assistant Professor c.julien@mail.utexas.edu Office: ACES 5.140 Offi ACES 5 140 Office Hours: TTh: 1112:30Introductions The Teaching Team Instructor Chris
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University of Texas - EE - 312
Micro architecture, logic circuits, and device technology -1st layer hardware vs. software Machine assembly language instruction set machine code High level programming language - c programming Not finished Need the designModels, design, and abstr
University of Texas - EE - 312
Notes 1.17 The History of C Was called NB o BCPL Orignated from the UNIX System By Denins Ritchie in Bell Labs Between 1969 and 1973 Became popular in the 1980s Original C o Called K&amp;R C By Kernighan and Ritchie o ANSI C ANSI Standard X3.159-1989
University of Texas - EE - 312
Read Chapter 3, 7, 22 Know Chapter 2 for Quiz on FridayNotes 1.22 Floats Float single precision Double double precision Long double extreme precision Must contain decimal point or exponent By default stored as double-precision numbers F or f, L
University of Texas - EE - 312
EE 312 Notes January 24, 2008Selection o Deciding among alternative executive paths Boolean values stored in variables Tested by program Using If and Else Statements Nested and Cascaded If statements Using Switch Statements Conditional Operators
University of Texas - EE - 312
EE 312 Notes January 24, 2008Sequence Follow Sequence 1, 2, 3 Condition is True Do until false Iteration False loop back to beginSelection Condition is true go to end Condition is not true, then do functionSelection o Deciding among a
University of Texas - EE - 312
E E 312 Notes Argc = number of pointers Char *argv[] = each value that is pass into function Int main ( int argc, char *argv[]) Command line &gt;myprog.c one two three Argc = 4 Argv[0] = &quot;my prog.c&quot; Argv[1]=&quot;one&quot; Argv[2] = &quot;two&quot; Argv[3] = &quot;three&quot; File i
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Chapter 7Membrane Structure and FunctionLecture OutlineOverview: Life at the Edge The plasma membrane separates the living cell from its nonliving surroundings. This thin barrier, 8 nm thick, controls traffic into and out of the cell. Like all
University of Texas - BIO - 311C
Chapter 13Meiosis and Sexual Life CyclesLecture OutlineOverview: Hereditary Similarity and Variation Living organisms are distinguished by their ability to reproduce their own kind. Offspring resemble their parents more than they do less closely
University of Texas - BIO - 311C
Chapter 14 Mendel and the Gene IdeaLecture OutlineOverview: Drawing from the Deck of Genes Every day we observe heritable variations (such as brown, green, or blue eyes) among individuals in a population. These traits are transmitted from parents t
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Chapter 16Lecture OutlineThe Molecular Basis of InheritanceOverview: Life's Operating Instructions In April 1953, James Watson and Francis Crick shook the scientific world with an elegant double-helical model for the structure of deoxyribonuclei
University of Texas - BIO - 311C
Chapter 15The Chromosomal Basis of InheritanceLecture OutlineOverview: Locating Genes on Chromosomes Today we know that genes-Gregor Mendel's &quot;hereditary factors&quot;-are located on chromosomes. A century ago, the relationship of genes and chromosom
University of Texas - BIO - 311C
Chapter 17From Gene to ProteinLecture OutlineOverview: The Flow of Genetic Information The information content of DNA is in the form of specific sequences of nucleotides along the DNA strands. The DNA inherited by an organism leads to specific t
University of Texas - BIO - 311C
Chapter 18The Genetics of Viruses and BacteriaLecture OutlineOverview: Microbial Model Systems Viruses and bacteria are the simplest biological systems- microbial models in which scientists find life's fundamental molecular mechanisms in their m
University of Texas - BIO - 311C
Chapter 20DNA Technology and GenomicsLecture OutlineOverview: Understanding and Manipulating Genomes One of the great achievements of modern science has been the sequencing of the human genome, which was largely completed by 2003. Progress began
University of Texas - BIO - 311C
Chapter 19Eukaryotic GenomesLecture OutlineOverview: How Eukaryotic Genomes Work and Evolve Two features of eukaryotic genomes present a major information-processing challenge. First, the typical multicellular eukaryotic genome is much larger th
University of Texas - BIO - 311C
Chapter 21The Genetic Basis of DevelopmentLecture OutlineOverview: From Single Cell to Multicellular Organism The application of genetic analysis and DNA technology to the study of development has brought about a revolution in our understanding
University of Texas - BIO - 311C
Chapter 22 Descent with Modification: Darwinian View of LifeLecture OutlineOverview: Darwin Introduces a Revolutionary Theory On November 24, 1859, Charles Darwin published On the Origin of Species by Means of Natural Selection. Darwin's book dre
University of Texas - BIO - 311C
Chapter 23Lecture OutlineThe Evolution of PopulationsOverview: The Smallest Unit of Evolution One common misconception about evolution is that organisms evolve, in a Darwinian sense, during their lifetimes. Natural selection does act on individ
University of Texas - ECON - 304K
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EE 302, Introduction to Electrical and Computer Engineering - Honors Dr. Archie Holmes, Jr. Exam #1Name: _ EID: _Please remember. Read the entire exam before starting If you feel you need more information than is given, please ask! Show all wo