[ssjheero_yuy99]

Hello,

I am just learning C++, I have already learned the concepts through Object Pascal and am now moving onto C++.

My question deals with arrays, specifically dynamic arrays. (please note I might be using Pascal terms).

I have a program that takes and inputs integers from the command line, however, this input stream can be as large or as small as the user wants it to be.

What I want to do is create a dynamic array for the stream to drop the values into so that I can remember the values that were entered into the input stream for later manipulation.

I know in Pascal I could create a dynamic array with no size or any size, then later in the program extend or decrease the length of the array at will. using the setlength(<arrayname>, <arraysize>); command.

What I am wondering is if there is the a way to do this same thing in C++, so that I don't have to have an array that is infinitly big to start with.

Thanks for your help and for reading!

[jaeusm]

Vectors are dynamic arrays in C++, and are part of the standard template library. Just include the <vector> header file.

[thejeremy]

Make sure you include the <vector> header file (as jaeusm said).

One vector constructor consists of the following,

vector<type> yourArray(x, y);

where "type" is the type of variable that your vector will hold (int, string, etc.), and the initial vector will hold x copies of the value y. For instance, if I used the constructor

vector<int> myArray(10, 0);

myArray would initially be composed of 10 slots that all hold the value 0.

To tack on an additional value at the end of the vector, use the function call push_back.

Here is a code snippet:

vector<string> sentence(3, "hello");
sentence.push_back("world");

The result of sentence is now ["hello", "hello", "hello", "world"]
Of course, for this example, you'd have to include the header file <string> but I'm assuming you already know that

[ssjheero_yuy99]

Hey guys,

Thanks for your help!

I got it figured out now, your responces were very useful.

Thanks again!