Hello World!
I'm talking about strings in C++.
I've started with the basic hello world program,
and I made a couple of little changes.
I have included the string header file.
I've added using namespace STD.
and instead of saying cout<<" hello world"
I have declared a string
named message with the value "hello world"
and then I say cout<<message
when I run this, you'll still see it prints "hello world"
if I  a dot after message
I get a list of all the various methods
that are available for the string class,
for an instance of the string class.
and I'm not going to talk about all of these,
But let's take a look at a couple that are interesting.
First of all we have length
and length is a method,
so I need the parentheses with that.
Let's try that again and it says the length is 12.
Let's take a look at that.
We have in position zero an H
and so we have 0, 1, 2, 3, 4, 5.
The space is in 5, and that counts.
and 6, 7, 8, 9, 10, 11
And so, numbers from zero to 11.
The string has 12 characters.
Let's try another one.
and one that you're going to find
a lot is substr, that stands for sub-string.
and substr, the first value
we want to give is the position were going to begin in.
and the next value is the length.
and let's run that and it shows "llo"
Let's see where that's coming from:
so the 'H' is in position zero,
and 'e' is in one.
and so beginning in position 2,
for a length of three gives us "llo"
Let's try one more interesting method:
and that's find, and let's find an "o"
the position where it finds an "o"
The position were it found an "o" was position 4.
so that 0, 1, 2, 3, 4.
There is another "o" over here,
but find is going to find the first one.
And so, those are just a few of the methods that we can use.
You can just type a dot and pick one
and then explore that a little bit
and become familiar
with some of the string functions. [methods]
And that's it for now.