Difference between revisions of "2012 Spring ECE 264 Yung-Hsiang Lu" - Rhea

Latest revision as of 12:30, 22 January 2012

Lecture 3

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-=Rhea Section for ECE 264 Professor Yung-Hsiang Lu, Spring 2012=
+[[Lecture 3]]
-Lecture 3
-Lecture 3 – 1/17/2012
-In class quiz – Know 3 or more classmates, their names, hometown, interests, career goals (submitted at the end of class)
-Reminder
-•	Exercise 1 due this coming Friday (January 20th)
-•	Write Programs in EE206
-•	Check blackboard everyday
-•	Submit your signature on the class policy sheet given the first day of class
-•	Office Hours:
-o	Tuesday and Friday after class in MSEE222, open door policy. You can discuss any topic.
-Today’s Programs
-•	Review of simple C programs
-•	Programming in Linux
-•	Maze files and rules
-•	Arc and argv
-•	Program to read characters in a file
-•	Function calls
-•	Practice how to write a program that can find 26 English characters and tell which ones appear the most often (ignore cases)
-•	Challenge: Write a program that can generate valid mazes
-In Linux…
-•	mkdir → makes a new directory (folder)
-o	EX: mkdir ECE264
-•	ls → lists the files in the directory
-o	EX: ls
-•	cd → changes the directory
-o	EX: cd Exercises
-•	File → determines what type of file you are dealing with
-o	EX: file prog1 (returns a ‘.c’ file type)
-•	emacs/vi 	filename.c → creates a file and puts it into a text editor of choice
-NOTE: Make sure never to have space in file name
-•	What is used to compile programs?
-o	  Linux:	        	gcc		prog1.c			-o		prog1
-o	  Translation:	Compiler     Human Readable   Name of Output file   Machine Readable
-o	  Linux:			./(no space)ex1				data
-o	  Translation:		Run Machine Readable and use a text file called data
-Example 1:
-a =1
-b=2
-if(a>b)
-	printf(“…”);
-a = 5
-What is the value of ‘a’ here? a = 5.
-•	In the statement above, it doesn’t matter what is inside the if statement because ‘a’ is later redefined to be a OUTSIDE the if statement
-•	Always remember to use brackets with all logic statements
-•	No “end” in C (as in MATLAB if statements)
-Indexing
-•	In C, index always begins with 0
-int arr[6];
-for( c = 0; c < 6; c++)
-{
-	c will be 0,1,2,3,4,5
-}
-It is wrong to do the following:
-int arr[6];
-for( c = 0; c <= 6; c++)
-{
-	c will be 0,1,2,3,4,5,6	ERROR: INDEX OUT OF RANGE
-}
-Inputting a string
-•	scanf(“%s”, str);
-•	printf(“%s”, str);
-Maze program:
-•	Each wall is one layer thick
-•	Always one exit, one start
-•	Always one solution
-•	Pathways are on * in length
-argc and argv
-•	Same as for function arguments,
-int add( int a , int b)
-•	But instead,
-Int main ( int argc , 		char *argv[] )
-	(# of arguments, 	array of each argument)
-argv element#
-             .	/	     a	    r	    g	   s	    \0      (What is stored in row 0)
-             d	             a	    t	    a	   \0                (What is stored in row 1)
-....
-•	The first argument is always the name of the command
-•	Several spaces count only as 1 space separating the arguments
-[[Category:ECE264Spring2012Yung-Hsiang Lu]]

Difference between revisions of "2012 Spring ECE 264 Yung-Hsiang Lu" - Rhea

Latest revision as of 12:30, 22 January 2012

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