Objective: C Tutorial: Pointers, Strings, Exec

The purpose of this tutorial is to review C pointers and the use of the exec routines to support

programming in C required for the assignments throughout TCSS$422.$

Complete this tutorial using your Ubuntu Virtual Machine installed above.

To complete this assignment, submit written answers to questions $1-9[2$ points for each of $1-8$; $4$ points

for $9(2$ for screen shot and $2$ for explanations$)]$ as a PDF file to Canvas. MS Word or Google Docs can be

used to easily create a PDF file. Submissions with reasonably answers that demonstrate understanding of

the core content of the tutorial will receive full credit.

Task I: Create a skeleton C program

Start by creating a skeleton C program. Several text editors are available in Linux to support writing C$.$

The Gnome Text Editor, or $$gedit$$ for short, is a GUI based text editor similar to notepad in Windows.

Popular command$-$line based text editors, sometimes called TUI editors, include: vim, vi$,$ pico, nano, and

emacs.

Optionally, try using an Integrated Development Environment for C under Linux. Search the internet to

find one you like.

To invoke these editors, open a terminal in Linux and type the name of the text editor:

pico exec.c

# pico and nano are similar

vi exec.c

# vim is a variant of vi

gedit exec.c &

# & runs the GUI in the background w$/$o blking the

shell

code exec.c

# for ms vs$-$code

TCSS $422$: Operating Systems Instructor: Juhua Hu

For $$gedit$,$ a GUI$-$based editor, it is recommended to $$background$$ the process. Gedit will then run, and

your command$-$line window will still be available for other work. The $$&$$ runs a command in the

background keeping the terminal available for use.

For text$-$based editors, the terminal will be used for the editor.

Now, enter the following code:

Copy & Paste the following code

#include

int main$($int argc, char $*$argv$[])$

$\{$

printf$("$hello world

$")$;

printf$("$number of args$=\%$d

$",$argc$)$;

for $($int i$=0$;i