explain this code please

Before i start i would just like to say this. If you are looking to learn c++, dont get "Learn to program with c++" by john smiley.

I have posted this two times already, but no one has actually explained the whole thing.

First part

Code:

for (int i = 0; i < morebankingbusiness.length(); i++)

What i get out of that is that the loop is called i and it starts at 0. As long as i is less than the length of morebankingbusiness then the interger i will increase 1. correct me if im wrong which i think i am.

Second part

Code:

float adjustment = 0;
char response[256];
string morebankingbusiness

I get that adjustment can be a decimal but i have no idea what "char response[256]" and "string morebankingbusiness" is.

Third part

further in the code there is this

Code:

cin.getline(response,256)

if strlen(response) == 0)...

what does that all mean.

Fourth part

Code:

else
if (atoi(response) <1...

what does that all mean.

it means you need to read more...

>for (int i = 0; i < morebankingbusiness.length(); i++)

it means loop until 'i' is greater than or equal to 'morebankingbusiness.length()'

>
float adjustment = 0;
char response[256];
string morebankingbusiness
<

'adjustment' is a float point variable i.e. can have decimal places

'response' is an array of 256 char's

'morebankingbusiness' is a variable of type 'string' this a C++ class... for more advanced safer string handling...

>
cin.getline(response,256)

if strlen(response) == 0)...
<

cin.getline(response,256)

reads a maximum of 255 characters from input and sets the last as character in the array to null.

if strlen(response) == 0)

strlen counts the length of a string
if the length of response is 0, do whatever is in the if statement...

>
else
if (atoi(response) <1...
<

atoi converts a string to an int, so...
if whatever int is contained in 'response' is less than zero do whatever is in the if statement