Need Cash Register and Test Averageing Program Help

[wenchman]

I've been doing homework handed out by my teacher for a while, and am stumped on two questions. I was wondering if anyone could just give me the answer, because no matter what I do, it's wrong.

1. Create a pgrogram which calculates teh average mark in a group of tests. Assume al tests are out of ten. Make the user enter the mark for each test in the group one at a time. When there are no more tests to input, enter the number "-1" and print out the average.
a) Make sure users can only enter numbers 1-10
b) Make it so the program can handle users entering no marks.

2. Create a program that will act as a simple cash register. It will accept the name of an item and the cost. The user will enter an item name "done" to signify that the customer is finished. The program will output a bill with the sub-total, PST, GST and total price.

a) Make it so the user can only enter positive values.
b) Display all items and their prices in the bill.

Any help on this will be greatly appreciated. I just can't seem to get these two last questions of my homework.


Here's one of mine, if it'll help, its my attempt to the first one:

code:

var mark, average, subtotal :real:=0 var count:int:=0 loop     loop     put "Type in a test mark between 1-10 and 45 to exit: "..     get mark     exit when mark >=0 and mark <=10 or mark = -1     put "Invalid."     end loop subtotal:= subtotal + mark count = count + 1 exit when mark = -1 end loop     loop     exit when count = 0     average := subtotal/count     exit     end loop

The other one is even worse

[Tony]

Quote:

subtotal:= subtotal + mark
count = count + 1
exit when mark = -1

you should exit for -1 before adding it to the total... else your total will be 1 less and divided by 1 more

Quote:

loop
exit when count = 0
average := subtotal/count

that doesn't make sence... exit when will never happen, your count starts at 1 because of the statement above. Why is average being calculated inside the loop? just drop the 2nd loop, only keep the average := line

[wtd]

One of your big problems is that you get each mark, but you never accumulate those anywhere.

[wenchman]

Oh, alright thanks. Can you guys please help me answer the 2nd question, I really have no idea - we just started the turing unit

[cool dude]

which one is question #4? there are only 2 questions as i see it

[wenchman]

cool dude wrote:

which one is question #4? there are only 2 questions as i see it

Sorry bout that, I said number 4 because there are 4 on my sheet and 4 is actually 2 here

[Tony]

use two arrays, one for item name, one for it's price. Keep a counter of how many items you have entered (similar to how you did in #1)

then to display the bill, just print out item's name from the array and its coresponding price.

add up the prices into subtotal (using a for loop) and total from the price array and display that as well

[wenchman]

tony wrote:

use two arrays, one for item name, one for it's price. Keep a counter of how many items you have entered (similar to how you did in #1)

then to display the bill, just print out item's name from the array and its coresponding price.

add up the prices into subtotal (using a for loop) and total from the price array and display that as well

Whats an array?

[wenchman]

Can someone give me a corrected version of my program? :s I'm really confused

[wtd]

wenchman wrote:

tony wrote:

use two arrays, one for item name, one for it's price. Keep a counter of how many items you have entered (similar to how you did in #1)

then to display the bill, just print out item's name from the array and its coresponding price.

add up the prices into subtotal (using a for loop) and total from the price array and display that as well

Whats an array?

http://www.compsci.ca/v2/viewtopic.php?t=1117

[Tony]

you own me 30 seconds

code:

var array_name : flexible array 1 .. 0 of string var array_price : flexible array 1 .. 0 of real var text : string var price : real loop     put "enter name"     get text     exit when text = "done"     put "enter price for ", text     get price     new array_name, upper (array_name) + 1     new array_price, upper (array_price) + 1     array_name (upper (array_name)) := text     array_price (upper (array_price)) := price end loop cls put "your bill is" for i : 1 .. upper (array_name)     put array_name (i), "\t", array_price (i) end for

eh, yeah... don't use that - that's cheating. Just an example.

[wenchman]

Thanks alot..

[Viper]

this is the same as his basicly but a lil more simple


put"Enter tag price please"
get cost
%>>>>>>>>>>>>>
tax:= cost*0.15
total:=cost+tax
put "Tax total is"," ",tax
put "And total is"," ",total
%>>>>>>>>>>>>>
loop
put"Enter amount of cahsgiven"
get cashgive
%>>>>>>>>>>>>>
if cashgive<total then
put"Sorry you did not give enough money for your perchase"
cls
else
cashback:=cashgive-total
put "Here is your change"," ",cashback
exit
end if