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

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

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

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

Login to UNIX User Name Oncourse username Password Oncourse password

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

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

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

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

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

Email All email correspondence should take place through Oncourse.

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

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 type pine The system will indicate the welcome message for the first time Type c to compose a mail Write majordomo@cs.iupui.edu 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

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

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

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

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