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Editing a C Program

01/16/15

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Objective

• Use Linux to edit, compile and execute a C program

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Login and Password• Don’t lose it

• Keep password a secret

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Steps to Run a C program

• Login into onyx

• Edit the program using vi or vim

• Compile the program with gcc

• Execute the program with a.out

• Logout out of onyx

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What are two modes in vi?

• Command

• Insert

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vim• I want to write a program whose output is:Martin Luther King said:

I have a dream.

• I will write a C program to do that.

• I will use the vim editor to create the program.

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To Execute a Program

• vim prog.c– Edit the program– Save with :wq

• gcc prog.c– If there are errors, correct and recompile.

• a.out

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Logout

• exit

• Right click on desk top

• Select “leave”

• Select “logout” button

• Important

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vim Commands• a, i -- Get into insert mode• <esc> -- Get back to command mode• x -- delete a character• dd -- delete a line• p -- paste• u -- undo• :wq -- write and quit• :q! -- quit without saving.• arrow keys -- move around

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More vim Commands• 3x -- Number makes command happen that many

times.• p - put (paste) • r – replace• G

• You should know the commands in the vimtutor, 1.1 to 4.1

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More Linux

• Command Formatcommand -options arguments

• Commands to know:– ls, lpr, cp , rm, mv, – mkdir, mv(to a directory), cd, cd .., rmdir– man, more, cat– exit

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Login from Remote Site

• You can get mobaxterm or other ssh software if you have a PC

• For Macs see me.

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Engr 213 & 214

• Labs for Comp Sci.

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Assignment

• See the website for assignment.• Do program 1 for next Friday, 1/23/15

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Next Week

• Hardware, software and algorithms

• Getting Started in C Programming