Hsc qu (1 Viewer)

[velox]

I dont really understand how they got the answer in this qu?

<a href="http://img212.imageshack.us/my.php?image=sddqu5zw.jpg" target="_blank"><img src="http://img212.imageshack.us/img212/7522/sddqu5zw.th.jpg" border="0" alt="Free Image Hosting at www.ImageShack.us" /></a>

 

[sunny]

The original algorithm fills the array by doing columns one at a time. Thus, the algorithm would have looked like:

for each column x
  for each row y
    insert random number into [x,y]

Since it is doing down a column, it needs to change the row counter each time so that it will complete one column before going on to the next. (get it straight in your mind that changing the row counter will cause the algorithm to go down a column)

So if you wanted to do the opposite (ie, fill each row one by one), you would want to move across each column to fill in one row

for each row x
  for each column y
    insert random number into [y,x]

This will mean the column counter changes first - resulting in a row being filled first (again, get it straight in your mind that changing the column counter causes the program to go across a row)

 

[velox]

I sort of understand what you are saying.

Am i correct to think that the whatever is in the outer loop will get filled first (just by common sense), so then you would have the rows in the outer loop as you want them to get filled first?

 

[sunny]

Yes thats a simplified way of looking at it.

 

[velox]

Thanks for your help =)

 

[velox]

Sunny, just one more question. With the structure diagram below, if we were asked to describe the processing, would we read it left to right?

<a href="http://img216.imageshack.us/my.php?image=sddqu5kv.jpg" target="_blank"><img src="http://img216.imageshack.us/img216/9384/sddqu5kv.th.jpg" border="0" alt="Free Image Hosting at www.ImageShack.us" /></a>

 

[Casmira]

Up to down, the answer for it is C

You'll notice that the Enter customer name and address and store customer are the only ones with option (square bracket)

Control paremeter isn't passed to store customer data

glhf ;D

 

[SamD]

Actually the answer is D

A is wrong as no data parameter is passed to "Enter Customer Name and Address"

B is wrong as control parameters are not passed to any module (they are returned from 2 modules).

C is wrong as it's around the wrong way. Actually "Store Customer Data" repeatedly calls "Store Customer Name".

D is CORRECT as the little diamond on the two call lines from "Controlling Process" means that either "Enter Customer Name and Address" OR "Store Customer Data" is called.

Structure diagrams (or charts) are not generally read from bottom to top, rather they are read according to the order of processing.

Here's a few questions to try (with regard to the above structure diagram)....

1. Write a pseudocode outline for "Controlling Process".
2. Write a pseudocode outline for "Store Customer Data".
3. Describe the order of processing.

HTH
Sam

 

[Ghost1788]

Thanks Sam i didnt know about the diamond thingy and i didnt notice the way C was written...

 

[Casmira]

back to the drawing board!

 

[SamD]

Start your "drawing board" by having a a go at my three questions. I promise to give you positive feedback!

Sam