COP $2220-$ Programming in C

Programming Assignment $7$: Registrar Database $(21$ points$)$

First, watch my videos on pointers, strings, structures, and files.

Then read ALL the following instructions CAREFULLY BEFORE writing any

code. That way, you can ask me questions or correct me if I made a

mistake.

Make sure that you have downloaded the accompanying text file,

registrar.txt$,$ and placed it in a folder that can be accessed by your

program when it is running. If you don't know how to do this, email

me and I will set up a Zoom meeting to show you.

Create a C program and save it as registrarYourInitials.c in your

cop$2220$ folder. $($Replace YourInitials with your own initials.$)$

The program will be designed so that it contains functions that you

will write. ALL function bodies are to be written BELOW the main

function but the prototypes for those functions must be written just

above the main.

I will NOT be specifying the algorithms for all functions in this

assignment since you need to learn how to come up with these

algorithms yourselves.

Put your name, the date, and the assignment number as comments at the

top of the program.

Include the stdlib.h and the string.h libraries just below the

include to stdio.h$.$

Type in the following preprocessor constant above the main:

#define MAX$\_$LENGTH $10$

Define the following structure type:

typedef struct dataRecord

$\{$

int courseID;

char course$[$MAX$\_$LENGTH$+1]$;

int numSeats;

int numRegistered;

Programming Assignment $7-$ Registrar Database

Page $2$

$\}$ RECORD$\_$TYPE;

Function prototypes:

int menu$()$;

void loadDatabase$($FILE $*$ infile, RECORD$\_$TYPE $**$ database, int

numRecords$)$;

void processChoice$($FILE $*$ infile, FILE $*$ outfile, int choice,

RECORD$\_$TYPE $**$ database, int numRecords$)$;

void displayDatabase$($RECORD$\_$TYPE $**$ database, int numRecords$)$;

void searchDatabase$($RECORD$\_$TYPE $**$ database, int numRecords$)$;

void writeReport$($FILE $*$ outfile, RECORD$\_$TYPE $**$ database, int

numRecords$)$;

The algorithm for the main function follows: $($Pay attention to

indentation in the algorithm.$)$

char $*$ infilename $=$ "registrar.txt$"$;

char $*$ outfilename $=$ "report.txt$"$; $//$Make sure that you DON'T

have a file by that name already. If you do$,$ change this name.

FILE $*$ infile;

FILE $*$ outfile;

int numRecords;

RECORD$\_$TYPE $**$ database;

Attempt to open the infilename for reading. If not successful,

print an error message and get out of the main function.

Attempt to open the outfilename for writing. If not successful,

print an error message and get out of the main function.

Read the first line of the file that has an integer

representing the number of data records following in the file.

Read that integer into the numRecords variable.

Create space for that many record pointers using malloc and

assign that space to the database variable.

Call the function loadDatabase and give it the parameters it

needs.

Declare an integer variable named choice.

Start a do$/$while loop as follows.

do:

Programming Assignment $7-$ Registrar Database

Page $3$

Call a function named menu and collect what it returns in

the variable called choice. The function does not take any

parameters.

Call a function named processChoice and pass it the

infile, outfile, the choice, the database, and the

numRecords in that order. This function does not return

anything.

while choice is not equal to $4.$

Close the infile.

Close the outfile.

The description of the loadDatabase function follows:

Declare an integer variable named i$.$

Declare integer variables named courseID, numSeats, and

numRegistered.

Declare a string variable named course of size MAX$\_$LENGTH $+1.$

Start a for loop using i from $0$ to less than numRecords. Inside

the loop do:

Read the course ID$,$ course, number of seats, and number

registered from the infile into the corresponding

variables using an fscanf.

Create space using malloc for one RECORD$\_$TYPE and assign

it to database$[$i$].$

Assign the values read in from the file to the

corresponding structure that you just created. Remember

that, for the course, you need to use strcpy$.$

The description of the menu function follows:

Present the user with the following menu:

$1)$ Display contents of database.

$2)$ Search the database.

$3)$ Write report.

$4)$ Quit.

Collect the user's selection and return it$.$

The algorithm for the processChoice function follows:

Use a switch statement to determine what choice was passed into

the function:

Programming Assignment $7-$ Registrar Database

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Case $1$: call the displayDatabase function and pass it the

database and the number of records.

Case $2$: call the searchDatabase function and pass it the

database and the number of records.

Case $3$: call the writeReport function and pass it the

outfile pointer, the database, and the number of records.

Case $4$: print "Bye!"

Default: print a message stating that the choice was

invalid.

The description of the displayDatabase function follows:

The function should display a header row with the follow