Reply to thread

Message: <blockquote data-quote="nabil" data-source="post: 1152353" data-attributes="member: 22203">Heres the detailed specification19.2 Background Petrol stations selling petrol usually show prices and amount ofpetrol dispensed on each petrol pump and also have a console in theoffice showing information about each sale from each petrol pumpon the garage forecourt.Each petrol pump shows how much petrol has been sold, the priceper litre in pence to one decimal place and the total amount to pay.The console also displays this information for each pump.Peter owns a small petrol station with one petrol pump. Every dayPeter needs to know the number of litres of petrol that are sold andthe total amount of money taken for the pump.You have been asked to write a PROGRAM to simulate the displayon the pump and on the console.The system you are to develop is simplified and should not includedetails about taking money from the customers but just assume thatthe amount displayed is the amount of money received. Also you arenot required to test for the customer’s petrol tank overflowing whenthe petrol is being dispensed.19.3 Specification 1. You have been asked to write a program to simulate the display ofone petrol pump only and the console. The program needs torecord the amount of petrol sold in tenths of a litre and the amountto be paid in pounds and pence every time the pump is used.The display on the petrol pump uses seven segment LCDs (LiquidCrystal Displays). As part of your programming you will need towrite and test a procedure to display a number as a seven segmentfigure. The console must also display the total amount of moneytaken but does not need to use an LCD.XXX.XX Amount to Pay (£ p)XX.X LitresXXX.X Pence per litreNote to teachers: if a candidate is unable to write a procedure tosimulate a seven segment LCD display successfully, a simplifieddisplay could be programmed but the candidate may be unable toprovide appropriate evidence to answer some questions set in theexamination.Computing - Advanced Subsidiary and Advanced, 2008 examination44 klm2. Peter at the console can:•  set and change the price per litre in pence•  zero the amount of petrol dispensed (this will alsoautomatically zero the amount paid)•  view the total takings and total petrol sold•  set the total takings and total petrol sold to zero at thebeginning of each day.3. The customer buying petrol can:•  remove nozzle from holster to indicate they are ready tobuy petrol•  squeeze the nozzle to put petrol in the tank•  stop squeezing the nozzle to stop putting petrol in thetank•  replace the nozzle to finish putting petrol in the tankEach of the above can be simulated by keystrokes or the use of abutton or similar.4. The petrol pump displays:•  the current price in pence per litre to 1 decimal place as sevensegment LCDs•  the amount of petrol dispensed at any time as seven segmentLCDs showing the number of litres to one decimal place.This display remains after the petrol has been dispensed untilzeroed by Peter from the console.•  the amount to be paid at any time as seven segment LCDsshowing the amount in pounds and pence. This displayremains after the petrol has been dispensed until the numberof litres of petrol dispensed has been zeroed by Peter.The pump can dispense between 0.5 and 100 litres in tenths of alitre. The price per litre can be up to 199.9 pence per litre.5. The console displays:•  The state of the pump:o  ready for use (display set to zero customer can startputting petrol in the tank)o  in useo  out of use (waiting for Peter to zero the display)•  the amount of petrol being dispensed by the pump when it isin use, showing the number of litres to one decimal place.This display remains after the petrol has been dispensed untilzeroed by Peter.•  the amount to be paid when the pump is in use in poundsand pence. This display remains after the petrol has beendispensed until the number of litres of petrol dispensed hasbeen zeroed Peter.Advanced Subsidiary and Advanced, 2008 examination - Computingklm 45When the nozzle is replaced in the holster the amount of petroldispensed is added to the total amount for that day, and the amountpaid is added to the total amount paid from all the sales that day.The pump is flagged as out of use until the number of litresdispensed is zeroed on the pump and the console, it is then set asready for use by the next customer.</blockquote>

Verification: Winadiyakata thappara keeyak tibeda?

Top Bottom