Quick Question

[Cdrwolfe]

Regarding Arrays and retrieval of Info

If you have say Char Array[100] and fill this with a simple binary alphabet ie (H,P)

Whats the best way to create another function which can call whats inside the array and then change each element so that H=1 and P=0, so i can then print this out?

Any help is appreciated

[Mario F.]

Can you please explain better what you want to do?

[bumfluff]

I was thinking that and wondering if he was meaning an enumerated list type thing.

[DougDbug]

You need to use a pointer. Since a function can only return one value, you need a pointer in order to "get to" all of the values in an array.

The same issue arises with C-style strings. If you read the Strings tutorial, you will notice that all of the functions in <cstring> use pointers.

in fact, it would be a good idea to work through the all of the cprogramming.com tutorials and a good beginning C++ book before you start "playing around" too much.

... so i can then print this out?

What operating system? Actual printing (to a printer) can be tricky on some operating systems. With Windows, you may have to use Win32 API functions & print via the Windows driver.

[Cdrwolfe]

Basically (hopefully)

Have user input a string of characters into an array, such as "HHPHHPHPHP".

Then have another function take this Array, read it and change it so that H=1 and P=0, ie "1101101010"

edit, sorry by print i was just meaning a simple "cout"

[Cdrwolfe]

I'll have a read through the pointers section again, i wa looking over the arrays section and thought it would only return 1 element in the array and i couldn't find a way to take out everything in the array for example.

Thanks for the help

[Mario F.]

Well, I don't think you need explicit pointers. All you have to do is to traverse the array, read each element at a time and change it accordingly.

for(size_t i = 0; i != arr_size; ++i) {
    switch(array[i]) {
        case 'H':
            array[i] = 1;
            break;
        case 'P':
            array[i] = 0;
            break;
        default:
            break;
    }
}

[DougDbug]

Here's another pointer tutorial. There's a little section called "Pointers and Arrays". The example doesn't use a function, but maybe it will get you on the right track.

[DougDbug]

Well, I don't think you need explicit pointers. All you have to do is to traverse the array, read each element at a time and change it accordingly.

It depends on "where you are" and where the array is coming from (variable scope). Since Cdrwolfe wants to use a "another function", he needs a pointer (or a reference).

In most programs, this is the case. A function is used to manipulate the array. The array is usually external to the function (not in-scope), so you need a pointer.

[Cdrwolfe]

Thanks for all the help guys, got some reading to do

Just wish there was a chat function so i wouldn't have to make a new post everytime i wanted to ask a simple question