1. Welcome to CSCI 230! Problem Solving using C
CSCI 230 Computing-I
Welcome to CSCI 230!
Problem Solving using C

2. Objectives for the Lab Learn problem solving strategies
Achieve intermediate knowledge of C Programming Language
Gain experience leveraging basic data structures
Get an understanding of simple algorithms

3. Agenda Environment setup Introduction to UNIX Login to Pegasus Email
UNIX files and directory structure
Basic UNIX commands

4. Agenda How to use a text editor
emacs editor -- basic commands
Create and compiler your first C program!
“Hello world” program
Compile using “gcc” compiler
Execute

5. Login to UNIX
User Name
Oncourse username
Password
Oncourse password

6. Login (Cont’d) UNIX is case-sensitive!
The username and the password are in lower-case
If you are NOT able to logon then:
Contact a Lab Instructor or Course Instructor
Once you login for the first time, the system will prompt you to change the password…create a new password and remember it

7. Introduction to UNIX
UNIX is a multitasking operating system that manages the resources of a computer and provides a user interface.
UNIX is case sensitive, which means, upper and lower case characters are treated as different characters.
The UNIX machine for which you are given an account is: pegasus.cs.iupui.edu

8. The UNIX Directory Structure
A directory is a location to store information.
UNIX starts with a root directory /
/etc /home /usr
/bin /jsmith /tjones /local

9. The UNIX Prompt login: jsmith Password:
Last login: Mon Aug :42:33 from gatekeep.usagrou
Sun Microsystems Inc. SunOS Generic February 2000
pegasus{jsmith}1:
Command number
Machine name
User name

10. Essential UNIX Commands
ls- list files in present working directory
pwd- display present working directory
cd- change directory
cd Backup one directory level
lp (or lpr) - print file to printer: Printer in SL251!
rm- remove a file
cp- copy a file
mv- move or rename a file
mkdir- make a directory
rmdir- remove a directory

11.
All correspondence should take place through Oncourse.

12. Class E-mail Subscription
Subscribe to the class to receive mail sent to the entire class by instructors and other classmates
Send mail to:
Subject: blank
Body of Message:
subscribe cs230

13. Pine
You can practice subscribing from unix, but you should subscribe from whatever account you use most during the day or the you want to receive emergency notifications.
From the unix prompt type pine
The system will indicate the welcome message for the first time
Type c to compose a mail
Write in the To field
Leave the Subject field blank
Type subscribe cs230 below Message Text
Type control x to send the mail
Type q to quit

14. How to Use Emacs pegasus{jsmith}1:emacs filename
There is a Tutorial listing the major emacs commands. I suggest you use the Tutorial.
To use the tutorial, type emacs at the prompt and then type <ctrl>h t. This starts the tutorial.
Quick Access Card – Linux

15. How to Compile A Program
pegasus{jsmith}1: gcc first1.c
C programs end in the “.c” extension
The executable file is called a.out

16. How to Execute Your Program
pegasus{jsmith}1: a.out
Type the name of the executable file at the prompt to run your program

17. Your First C Program # include <stdio.h> main(void) {
printf(“Hello, CSCI 230!\n”); }
Try it!