All language subtitles for 1. Challenge 1 - Implementing strlen

All right, welcome back, guys.

So what we're going to do in these video is we're going to write a function of our own implementation

to the Starland function.

So we know that this function receives it receives so function that it receives receives a string.

OK, and these function finds out, finds out and returns and returns the length of the string.

OK, so the length of the string.

And we know that it can be done very easily because you are a string in our C programming.

Language is just an array of characters with the last character equals two backslash zero.

So what we are going to do here is to write a function which is going to be of an integer type because

we are looking for a lengthy shouldn't be of a floating point, of course.

So end and let's call it the heartland exactly like we want to use it in our string, that H library.

But this is going to be our own implementation.

And these function is going to receive the address of the first element in this string, in this array

of characters.

So it's going to be Char Star and let's call it ETR.

OK, so SDR will hold the address of the first element in the string.

And since we know it's a sequence, it's going to iterate over it and find the length.

Of course we could have used Heery const so that we will make sure that these function will not change

SDR.

But for now, since we are not so familiar with this, we simply are going to stick with this with this

signature of the function.

So there you go.

Here is our Starland.

So just copy it here and let's implement it.

Very simple implementation.

We are going to use and I and we are going to run over all of these string all all over this array of

characters and find out where we find our first, let's say, backslash zero.

Right.

So while while ETR at Index Eye does not equal to backslash zero, OK, does not equal to this one,

we are going to increment I by one.

So I plus plus and every time we're going to incremented by one.

And once we got here, once we, we found that our character is backslidden zero, then we know that

we found also the size of these string and the size is going to be of course in inside of these I variable

because I specifies the index as well as it's used to find the length.

So in this case we are going to return EI, which is of the size of the string.

So there you go.

Very simple.

Just sent the first address of the string, iterated over it to find where is the first element that

is equal to zero, meaning at the end of the string use then I variable to find its length and then

return I that's it guys.

Not complicated.

That's our implementation for the plan.

And I hope you are proud of yourself.

So thank you so much for watching and I'll see you in the next video.

Bye bye.