CSCI 230 Computing-I

1. CSCI 230Computing-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 • Login to Pegasus • Email • Introduction to UNIX • 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 inlower-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 22 08:42:33 from gatekeep.usagrou Sun Microsystems Inc. SunOS 5.8 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. Email • All email correspondence should take place through Oncourse.

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

13. Pine • You can practice subscribing from unix, but you should subscribe from whatever email account you use most during the day or the email you want to receive emergency notifications. • From the unix prompt typepine • The system will indicate the welcome message for the first time • Typecto compose a mail • Write majordomo@cs.iupui.eduin 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 pegasus{jsmith}1: gcc first1.c

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!