Problem Specification

For this programming assignment, you will implement of a C program for printing digits $0,1,$

$2,...,9$ on console using three horizontal segments $($a$,$ g$,$ and d$)$ and four vertical segments

$($f$,$ b$,$ e$,$ and c$)$ as depicted in Figure $1.$

Figure $1$: Top row from left to right depicts how digits $0-4$ are represented using seven

segments. Bottom row from left to right depicts how digits $5-9$ are represented using seven

segments.

To draw each horizontal segment, you need to print two rows of asterisks and to draw

each vertical segment, you need to print two columns of asterisks. The length of horizontal

and vertical segments will be given by the user of the program. Figure $2$ is an example of

displaying digit $8$ using seven segments made of asterisks.

$2$ Program Input

The program starts by displaying the following message:

$$This is a $7-$segment display! Press $$Enter$$ after providing any number in keyboard.

Please enter the length of horizontal segments $($from $3$ to $40)$: $$

After the user enters the length of horizontal segments using keyboard, your program will

check the entered length. If the length is less than $3$ or greater than $40,$ the program must

$1$

$****************$

$****************$

$****$

$****$

$****$

$****$

$****$

$****$

$****$

$****$

$****$

$****$

$****$

$****$

$****************$

$****************$

$****$

$****$

$****$

$****$

$****$

$****$

$****$

$****$

$****$

$****$

$****$

$****$

$****************$

$****************$

Figure $2$: How digit $8$ is represented using asterisks. In this example, the length of each

horizontal segment is $16$ asterisks and the length of each vertical segment is $12$ asterisks.

print a message stating that the length is not acceptable and the user must try entering the

length again. When user enters an acceptable length for the horizontal segments, then, the

program prints out the following message on screen:

$$Now$,$ enter the length of vertical segments $($from $3$ to $40)$: $$

After the user enters the length of vertical segments using keyboard, your program will

check the entered length. If the length is less than $3$ or greater than $40,$ the program must

print a message stating that the length is not acceptable and the user must try entering the

length again. Also, if the length of vertical segment is greater than twice the length

of horizontal segment or less than half of the length of horizontal segment, the

program must print a message stating that the length is not acceptable and the user must try

entering the length again. When user enters an acceptable length for the vertical segments,

then, the program prints out the following message on screen:

$$Enter a positive integer: $$

After the user enters the positive integer, the program checks to see if the user input

is a valid positive integer. If the user input is not legal, the program must print out a

message stating that the user input is not acceptable and the user must try entering the

positive integer again. When user enters an acceptable input $($a positive integer$),$ the program

prints out the seven$-$segment representation of that number. Then, the program repeats this

process $($printing the message $$Enter a positive integer: $$ and printing out its seven$-$segment

representation$)$ indefinitely.

To end this infinite loop, user can simply presses Ctrl $+$ D $,$ which is a way to pass

EOF character to the program via standard input stream $($keyboard$).$

$2$

$3$ Submissions

You need to submit a $.$zip file compressing $1)$ the C source file$($s$)$ related to the assignment

$(.$c files$),2)$ header file$($s$)(.$h files$)$ if any, $3)$ a snapshot of your Unix terminal running GDB

on your code $(.$jpg or $.$png file$),$ and $4)$ a makefile. Please use $$sevenseg$$ to name the

executable of your program in the makefile to make sure that the autograder can

successfully run your program. Starter code: #define MAX$\_$LEN $100$

#include

void main$($void$)\{$

printf$("$This is a $7-$segment display! Press $\backslash "$Enter$\backslash "$ after providing any number in keyboard.

$")$;

int segment$\_$width;$//$width of horizontal segments in the $7-$segment display

int input$\_$error;$//$flag to show whether some error is detected in user's input

char string$[$MAX$\_$LEN $+1]$;$//$placeholder to hold user's input from keyboard

while$(1)\{$

printf$("$Please enter the length of horizontal segments $($from $3$ to $40)$:

$")$;

input$\_$error $=$ segment$\_$width $=0$;

for$($int i $=0$; i $$ MAX$\_$LEN;i$++)\{$

if$($i $==3)\{//$Given input must be a $1$ or $2-$digit positive integer.

input$\_$error $=1$;

break;

$\}$

string$[$i$]=$ getchar$()$;

if$($string$[$i$]==\text{'}$

$\text{'})\{//$end of user's input

string$[$i$]=\text{'}\backslash 0\text{'}$;

break;

$\}$else if$($string$[$i$]<mtext\; id="EditorElement\_15429"></mtext><mi\; id="EditorElement\_15430">\text{'}</mi><mn\; id="EditorElement\_15431">0</mn><mi\; id="EditorElement\_15432">\text{'}</mi><mtext\; id="EditorElement\_15433"></mtext><mi\; id="EditorElement\_15434">|</mi><mi\; id="EditorElement\_15435">|</mi>$ string$[$i$]>\text{'}9\text{'})\{//$not a digit is given by user

input$\_$error $=1$;

break;

$\}$else

segment$\_$width $=10*$ segment$\_$width $//$accounts for previously entered digits...

$+($string$[$i$]-\text{'}0\text{'})//$converting ASCII code of string$[$i$]$ to its numerical value...

;$//$converting the #define MAX$\_$LEN $100$

#include$$stdio $$