@JohnRennie Hello

@pi-π Hi :-)

@JohnRennie Write a program using C language that reads different names and addresses into the computer and rearrange the names into alphabetical order using the structure variable.

@pi-π I'm busy answering another question at the moment. Shall I ping you when I'm free?

@JohnRennie Okay

@pi-π Hi :-)

@JohnRennie Hello !

How well do you know C?

@JohnRennie I can program easily in C

So creating an array of structs and reading data into it should be straightforward. Yes?

Yes

So where is the problem with this? How to sort the data?

@JohnRennie Yes! Sorting the data

C has a built in sort function that you can use. In stdlib.h there is a function called quicksort() that you can use to sort arrays.

okay!!

If you write the program to read the data into an array of structs I can show you how to use quicksort() to sort the data.

Hi @JohnRennie

Hi :-)

I need to go out soon I'm afraid. Is it quick?

yes

Ok, go ahead.

x(t)=x(0)e^(-kt/m) is eqn of spring. How is it behaving?

Have you drawn a graph of x against t to see what it looks like?

No

Draw the graph and see.

At zero it is at 5 say the x0=5 as t tends to infinity x tends to zero

Yes, this is an example of damped motion.

Meaning?

@JohnRennie Okay! X0 is starting point where the sprint is in stretched state

?

The point at which the osclaltion disappears is known as critical damping

If you Google this you'll find lots of articles about it.

And now I need to go. I'll be back ina couple of hours.

Ok! But what is x0?

x₀ is the initial displacement i.e. the displacement at time 0.

Means in stretched state?

i.e. you stretch the spring a distance x₀ then let go at time zero.

Ok! Thank you