Original subtitles

Hello, and welcome to your first challenge.

This is going to be a rather easy challenge for storage classes.

I provided a quiz.

The storage classes are kind of tough to have programming, exercise in

there that do anything real relevant.

So these are just some easy challenges.

I'm going to provide you with three challenges.

They're really small, but they will help you better

understand storage classes in c.

And as I mentioned, they're quite easy, so they shouldn't take too long.

The first challenge that I want you to write is just a small program that

really just declares some variables.

I want you to declare some variables with specific storage class

specifiers that you need to use.

So for example, you have to clear an invariable block scope in temporary

storage, global double variable that is only accessible inside the file.

Float variable that's global, accessible throughout

the entire program.

A float local variable with permanent storage, a register int variable and

a function that is only accessible within the file that is defined.

So pretty straightforward.

If you understand the storage class specifiers, this is

going to be very easy to do.

Our second challenge is you're going to have to write a c program

that finds the sum of a number.

It's really just going to retain its value for each call.

So you can't pass any variable representing the running

total to the sum function, so it can't take a parameter.

It just takes one parameter for what you want to sum, what you

want to add to the previous total.

So it'll just be a sum function take some number.

You'll find the sum of a number from the previous call.

So you'll see this example in the output.

So for example if I call sum three times passing in 25 15

and 30, the output is actually going to be 25 the first time,

40 the second time and 70 third.

So each time you call it it's summing that number that's

passed in from the previous sum.

So you have to use the storage class specifier to implement this.

The third challenge is you're gonna need to create a c program that

shares a variable amongst two files.

So create a source file named main.c.

The source file should include a globe variable used as a loop counter.

This file includes a main function that uses the global variable to

iterate through a loop five times.

Inside this loop a function should be invoked, something

like a display function that is defined in another file and

you cannot use an include file.

The display function should take two parameters.

And then in the other file display.c, this is where the display function

is defined and this function will display the global variable

from main.c incremented by one.

So since these are pretty easy, I'm not going to actually

have an entire demonstration.

I'm going to provide you with the source files in

this lecture containing the source code for solutions.

If you have any questions, please let me know.

But again, these are rather easy challenges with easy solutions.

So I don't think there's -- it's necessary to provide an

entire demonstration.

Thank you.