$1$

COP $3223$

Introduction to C $-$ Programming Assignment #$3$

Due date: See syllabus

Objectives

$1.$ To reinforce your knowledge of $$for$$ loops and $$while$$ loops

$2.$ To utilize strings $($character arrays$)$ in C

$3.$ To implement logic in a program that is menu$-$based and is the seed for a complex, practical

software system.

Problem: Food Bank Program

A Food Bank is a non$-$profit organization which distributes food items to people in need during

local emergency food programs. People come in to a Food Bank and make their donations, and

others might come in to make a request for any food item they want.

A Food Bank Program is used to keep track of the stock the Food Bank has $($i$.$e$.,$ the donations$),$

keep a record of requests that come in$,$ fulfilling requests and printing the status report which

consists of the amount of stock present in the food bank and the requests that are not yet fulfilled.

The program would require you to make two tables: Donations Table and Request Table. Each

table will have two attributes: the Inventory Type, which is what type of food item it is$,$ e$.$g$.,$ Milk,

Meat, etc., and the Amount, which is the amount of that food item, e$.$g$.,20,30,$ etc. Note: For

simplification, no units for amounts are considered.

Functionality Specification

$1.$ Add donations and requests to the tables.

$2.$ For any new donation that comes in$,$ check if any donation is present in the donations table

with same inventory type; if there is one then increase its amount by the new donation

amount, and do not add a new entry in the donations table. If not, then add a new entry in

the donations table for that donation.

$3.$ Remove a request from the request table when it is fulfilled.

$4.$ If for a request the request amount is greater than the amount present, then partially fulfill

that request by the amount present. And do not delete that request from the request table;

just reduce its amount by the amount that is fulfilled.

$5.$ If in the process of fulfilling the request, the amount present for any donation becomes

zero, then remove that donation from the donations table.

$6.$ Print the status report, containing stock currently available and requests that are not yet

fulfilled.

$7.$ When the option is to Fulfill a Request, you are to only process the one request that is at

the top of the Request Table $($the oldest request$).$ Thus, if it cannot be fulfilled, it will stall

the system, until someone donates enough, so it can be satisfied later.

$2$

Input$/$Output Specification

At the beginning, the program should present the user with the available options, and ask for his$/$her

preference. Based on the preference, the program should perform the corresponding task.

The user will have five choices:

$1.$ Enter a Donation

$2.$ Enter a Request

$3.$ Fulfill the earliest Request

$4.$ Print status report

$5.$ Exit

When the user selects $1,$ the program should ask the user for the inventory type and amount of

the donation to be made. When the donation has been added to the donations table, the program

should notify the user by printing out $$Donation Added$.$

When the user selects $2,$ the program should ask the user for the inventory type and amount of

the request to be made. When the request has been added to the requests table, the program should

notify the user by printing out $$Request Added$.$

When the user selects $3,$ the program should print $$Request Fulfilled$$ if the request is completely

fulfilled, print $$Cannot be Fulfilled$$ if there is no donation of that type, and print

$$Partially Fulfilled$$ if the donation type exists, but cannot completely satisfy the request.

If a request is fulfilled, it should be deleted from the Requests Table; if a donation is fully

used up in satisfying a request, the Donation Table entry should be deleted.

When the user selects $4,$ the program should print the current Donations Table and the Requests

Table.

When the user selects $5,$ the program should print $$Thank You for running the software. Bye for

now$,$ and then the program exits.

Implementation Hints

If we assume that the maximum number of donated types at any time is $100,$ and that the

Maximum length of a description of the type is $19,$ then, our tables can be declared as:

char donations$\_$inv$\_$type$[100][20]$;

int donations$\_$amount$[100]$;

You will need to have variables to keep track $($count$)$ of the total donated types, and total requests,

in the two tables.

Use function $$strcmp$$ to compare if two strings are equal. Remember that when the two strings

are equal this function returns $0.$

Use function $$strcpy$$ to copy from one string variable to another.

$3$

While removing the request from the requests table once it is fulfilled, you will have to shift up

the requests that are below that request in the request table, to take the place of the removed request.

The same applies when you remove a donation, if the donation amount becomes zero.

For every new donation you will have to check if the inventory type of that d