#include

#include

#include

$////////////////////////////////////////////////////////////////////////////////$

$//$MACROS: CONSTANTS

$////////////////////////////////////////////////////////////////////////////////$

$//$DATA STRUCTURES

$////////////////////////////////////////////////////////////////////////////////$

$//$GLOBAL VARIABLES

$//$place to store course information

struct CourseNode$*$ course$\_$collection $=$ NULL;

typedef enum$\{$

SER,

EGR,

CSE,

EEE

$//$ SER $=0,$ EGR $=1,$ CSE $=2,$ EEE $=3$

$\}$SUBJECT;

typedef struct CourseNode$\{$

SUBJECT subName;

int courseNum;

char teacher$[1024]$;

int hours;

struct CourseNode$*$ next;

$\}$CourseNode;

int totalCredits$($struct CourseNode$*$ head$)\{$

int credits $=0$;

struct CourseNode$*$ tmp $=$ head;

while$($tmp $!=$ NULL$)\{$

credits $+=$ tmp $->$ hours;

tmp $=$ head$->$next;

$\}$

return credits;

$\}$

char$*$ subName$()$

void course$\_$insert$($struct CourseNode$**$ head, int subNum, int courseNumber, int credHours, char$*$ prof $)\{$

struct CourseNode $*$newClass $,*$current;

newClass $=($struct CourseNode$*)$malloc$($sizeof$($CourseNode$))$;

newClass $->$subName $=$ subNum;

newClass $->$courseNum $=$ courseNumber;

newClass $->$hours $=$ credHours;

strcpy$($newClass$->$teacher, prof$)$;

if$(*$head $==$ NULL $||(*$head$)->$courseNum $>=$ newClass$->$courseNum$)\{$

newClass$->$next $=*$head;

$*$head $=$ newClass;

$\}$

else$\{$

current $=*$head;

while$($current $->$next $!=$ NULL && current$->$next$->$courseNum $<$ newClass$->$courseNum$)\{$

current $=$ current$->$next;

$\}$

newClass$->$next $=$current$->$next;

current$->$next $=$ newClass;

$\}$

$\}$

void course$\_$drop$($struct CourseNode$**$ headRef, int num$)\{$

CourseNode$*$ tmp $=*$headRef$,*$prev;

if$($tmp $!=$ NULL && tmp$->$courseNum $==$ num$)\{$

$*$headRef $=$ tmp$->$next;

free$($tmp$)$;

return;

$\}$

while$($tmp $!=$NULL && tmp$->$courseNum $!=$ num$)\{$

prev $=$ tmp;

tmp $=$ tmp$->$next;

$\}$

if$($tmp $==$ NULL$)\{$

return;

$\}$

prev$->$next $=$ tmp$->$next;

free$($tmp$)$;

$//$tmp $=$ NULL:

$\}$

void schedule$\_$print$()\{$

struct CourseNode$*$ tmp;

while$($tmp $!=$ NULL$)\{$

switch$($tmp$->$subName$)\{$

case $0$:

printf$("$SER $\%$d $\%$d $\%$s $",$ tmp$->$courseNum,tmp$->$hours,tmp$->$teacher$)$;

break;

case $1$:

printf$("$EGR $\%$d $\%$d $\%$s $",$ tmp$->$courseNum,tmp$->$hours,tmp$->$teacher$)$;

break;

case $2$:

printf$("$CSE $\%$d $\%$d $\%$s $",$ tmp$->$courseNum,tmp$->$hours,tmp$->$teacher$)$;

break;

case $3$:

printf$("$EEE $\%$d $\%$d $\%$s $",$ tmp$->$courseNum,tmp$->$hours,tmp$->$teacher$)$;

break;

default:

printf$("$You have no classes in your schedule."$)$;

break;

$\}$

tmp $=$ tmp $->$next;

$\}$

$\}$

void branching$($char option$)$;

$//$main entry point. Starts the program by displaying a welcome and beginning an

$//$input loop that displays a menu and processes user input. Pressing q quits.

int main$()\{$

char input$\_$buffer;

printf$("$

Welcome to ASU Class Schedule

$")$;

do $\{$

printf$("$

Menu Options

$")$;

printf$("------------------------------------------------------$

$")$;

printf$("$a: Add a class

$")$;

printf$("$d: Drop a class

$")$;

printf$("$s: Show your classes

$")$;

printf$("$q: Quit

$")$;

printf$("$

Total Credits: $\%$d

$",$ totalCredits$($course$\_$collection$))$;

printf$("$Please enter a choice $--->")$;

scanf$("\%$c$",$ &input$\_$buffer$)$;

branching$($input$\_$buffer$)$;

$\}$ while $($input$\_$buffer $!=\text{'}$q$\text{'})$;

free$($course$\_$collection$)$;

return $0$;

$\}$

$//$takes a character representing an inputs menu choice and calls the appropriate

$//$function to fulfill that choice. display an error message if the character is

$//$not recognized.

void branching$($char option$)\{$

int classNum;

int subjectNum;

int courseCred;

int n;

char teacher$[1024]$;

switch $($option$)\{$

case $\text{'}$a$\text{'}$:

printf$("$Add class subject $($SER: $0|$ EGR: $1|$ CSE: $2|$ EEE: $3)$:$")$;

scanf$("\%$d$",$ &subjectNum$)$;

if$($subjectNum $>3||$ subjectNum $<0)\{$

printf$("$Choose between the given selection please!

Pick class: $")$;

scanf$("\%$d

$",$ &subjectNum$)$;

$\}$

printf$("$What are the $3$ numbers that follow the subject? $($Ex: SER $334)$: $")$;

scanf$("\%$d$",$ &classNum$)$;

printf$("$How many credits is this class?: $")$;

scanf$("\%$d$",$ &courseCred$)$;

printf$("$Who teaches this class?: $")$;

scanf$("\%$s$",$ &teacher$)$;

course$\_$insert$($&course$\_$collection,subjectNum,classNum,courseCred,teacher$)$;

break;

case $\text{'}$d$\text{'}$:

printf$("$enter the course number for the class you would like to drop: $")$;

scanf$("\%$d$",$ &n$)$;

course$\_$drop$($&course$\_$collection, n$)$;

break;

case $\text{'}$s$\text{'}$:

schedule$\_$print$()$;

break;