Algebra

a=b

Multiply by a:

a²=ab

Subtract b²:

a²-b²=ab-b²

Factor:

(a-b)(a+b)=b(a-b)

Divide by (a-b):

a+b=b

As a=b, substitute:

b+b=b

Combine:

2b=b

Divide by b:

2=1

Question. What's wrong?

Fair

C#

namespace MVAP

{

    class Canvas : Panel

    {

        public class StateObject

        {

            // Client  socket.

            public Socket workSocket = null;

            // Size of receive buffer.

            public const int BufferSize = 1024;

            // Receive buffer.

            public byte[] buffer = new byte[BufferSize];

            // Received data string.

            public StringBuilder sb = new StringBuilder();

        }

        StateObject state;

        public int iPage;

        public static Socket sock;

        Timer t;

        int X, Y;

        public Canvas()

        {

            Y=X*2;

        }

        public void Close()

        {

            sock.Close();

        }

    }

}

1.  Q1  I want to change X on an instance of Canvas from another class inside the MVAP namespace.

Canvas canvas=new Canvas();

When I type

         canvas.

I expect intellisense to offer me canvas.X. Why doesn't it?

2.   Q2 When I change X from my other class, I want the canvas to calculate Y as X*2 automatically. How do I do that?

3.   Q3 I want a routine which opens sock and broadcasts a single character poll on it. I want the program to do nothing apart from accept user input after that, but if the equipment receiving the broadcast sends a response, I want the canvas instance to asynchronously receive it and act on it. How do I do that?

C

int i;

i=1;

int k;

switch (i)

{

         case 1:

                 int j=1;

         case 2:

                 int j=2;

         default:

                 j++;

                 k=j;

}

1.  Q4 Where are the compilation errors?

2.  Q5 Assuming I fix the compilation errors, what is j at the end of this?

3.  Q6 What is k at the end of this?

struct a {

         int i;

}

struct b {

         int i;

}

struct c {

         struct a *pa;

         struct b **ppb;

}

1 Q7   I want to make a new instance of struct c, which holds exactly one struct a and many struct b's. I want to expand this as and when required. How would I declare this and how would I add to it?

SPI

I have two PICs which need to communicate via SPI. The master needs to communicate at 2Mbps.

1.  Q8 How do I set the speed of the slave PIC?

2.  Q9 The master sends a single-character request to the slave, and reads back a single-character response dependant on the request. How do I achieve this without the master sending more than one byte?

        

Nightmares

I don't know why I'm telling you this, perhaps I'm hoping it will go away.

I have recurring nightmares, about three things. I used to have only one, but it went away. I had a bedroom (I didn't really, it was in the nightmare) which was three floors up in a house and I had to go through a winding corridor to get to it, but I kept getting stuck in the corridor and died. Most nights.

I'm glad I don't have that one any more.

The ones I have now are from experiences.

First one: I was a Plod at the Guildford Bombings (yes, I am that old) and I had to pick up bits of body and stuff. I get flashbacks from that one, still. I think this was in 1976.

Second one: I visited an old gaol somewhere in the lakes years ago. There was a dungeon, which was a gurt hole in the ground, with a small hole into which they dropped a prisoner for (say) stealing a chicken or owing the council some money. A "magistrate" sentenced him to having his arms tied behind his back and then dropping him down the hole, so his shoulders dislocated. If it didn't work, they did it again with weights tied to his feet, and if it didn't work again, increased the weight until it did. I think they did this in the 1800's.

Third one is the story of a chap who had a cross-amputation, i.e. have one arm and the opposite leg removed, with no anaesthetic, on a carpet of polythene, by "priests" with bonesaws and butchers' cleavers. The thing that got me was that he said "please make it quick." They didn't. They did this very recently and a far as I know they still do.

What I'm getting at is how, and why, a human can do any of these things to another human, or animal, in the name of some old bollocks which really didn't matter then and still doesn't.

WHY can't people just be?


"Many and sharp the num'rous ills 
Inwoven with our frame! 
More pointed still we make ourselves, 
Regret, remorse, and shame! 
And man, whose heav'n-erected face 
The smiles of love adorn, - 
Man's inhumanity to man 
Makes countless thousands mourn! 

Robert Burns.

Weird email

Good Morning

 Hope you get this on time, I made a trip to Brussels(Belgium) i had my bag stolen from me with my passport and personal effects therein. The embassy has just issued me a temporary passport but I have to pay for a ticket and settle my hotel bills with the Manager.

I have made contact with my bank but it would take me 5-7 working days to access funds in my account, the bad news is my flight will be leaving in less than 12-hrs from now but I am having problems settling the hotel bills and the hotel manager won't let me leave until I settle the bills, I need your help/LOAN financially and I promise to make the refund once I get back home,the fastest and safest means of getting the money to me now is via Western union Money Transfer you are my last resort and hope, Please let me know if I can count on you and I need you to keep checking your email because it's the only way I can reach you.

Waiting for your mail

Many thanks,

KC