has to be done using pseudo code Assume that a file named inventory, which conta

Question

has to be done using pseudo code

Assume that a file named inventory, which contains the inventory of parts for the Legendary Lawn Mower Company, already exists with records of the following form: partnumber (integer), partname (string), quantity (integer).

Also assume that the records in this file are ordered by increasing part number. For each part of this problem, write a program that performs the indicated task.

a) Input a part number from the user and delete the corresponding record from the inventory file.

b) Input a part number and a quantity from the user and modify the record corresponding to that part number by changing the value of its last field to the quantity input.

c) Input a new part number, part name, and quantity from the user and insert the corresponding record in the proper place in the inventory file.

Explanation / Answer

a)

Delete(partnumber) //write a function to delete a record

open file inventory using inventory =fopen("inventory","r") in read mode

open temporary file in write mode temp= fopen("temp","w")

string a //declaring string

getline(inventory,a) //getting first line of inventory

int part = a.partnumber //can obtain by splitting line by comma and convert first value into integer

while(a!=eof) { //checking whether file ended or not

if (part != partnumber) //check if partnumber is same as the one to be deleted

since partnumber is not same as the one to be deleted write the line a into temp

else

since this record is to be deleted don't write this to temp.

getline(inventory,a)

part = a,partnumber

}

After while loop is done

close both file descriptors and rename temp to inventory

So at the end of function we'll have inventory without the record of input partnumber.

b)

UpdateRecord(partnumber , quantity)

open file inventory using inventory =fopen("inventory","r") in read mode

open temporary file in write mode temp= fopen("temp","w")

string a //declaring string

getline(inventory,a) //getting first line of inventory

while(a!=eof) //checking whether file ended or not

if (a.partnumber != partnumber) //check if partnumber is same as the one to be deleted

since partnumber is not same as the one to be updated write the same line a into temp

else

write record into temp file with updated quantity since quantity of part has changed.

getline(inventory,a)

}

After while loop is done

close both file descriptors and rename temp to inventory

So at the end of function we'll have inventory with the record of input partnumber updated with new quantity number.

c)

InsertPart(partnumber,partname,quantity)

open file inventory using inventory =fopen("inventory","r") in read mode

open temporary file in write mode temp= fopen("temp","w")

string current //declaring string

getline(inventory,current) //getting first line of inventory

int current_part = current.partnumber //can obtain by splitting line by comma and convert first value into integer

int inserted =0 //check whether record is inserted or not

while(current!=eof) { //checking whether file ended or not

if(current_part > partnumber && inserted ! =1 ) //checking where to insert so that increasing order is preserved or not.

{ write new record ("partnumber,partname,quantity") to temp because inventory should be in increasing order

write current to temp //because this follows the inserted record and initial record is already sorted

inserted = 1 // so that it's not inserted again

}

else

write current to temp file // since this is not the position to insert

getline(inventory,current)

current_part = current.partnumber

}

After while loop is done check whether new part is inserted or not by the value of inserted

if (inserted == 0) // implies new record should be inserted at end

{

write new record to temp file with string "partnumber,partname,quantity"

}

close both file descriptors and rename temp to inventory

So at end of function we'll have new inventory with part inserted at position according to increasing order.

Main()

output to user asking which task to perform : " 1 for deleting , 2 for updating quantity of a part , 3 for inserting a new part and 4 to exit "

if task is 1 //for deleting

cin>>partnumber //take input partnumber

delete(partnumber)

if task is 2 // implies updating quantity of a part

cin>>partnumber>>quantity //take inputs

UpdateRecord(partnumber,quantity) //function call to update record

if task is 3 // task is to insert new part into inventory

cin>>partnumber>>partname>>quantity

InsertPart(partnumber,partname,quantity)

if task is 4

exit

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