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POHow to store the data produced during a while loop?
 

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  1. POHow to store the data produced during a while loop?
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    <p>I started C++ (as the 1st programming language I ever tried to learn) a few hours ago, and I am blocked on a very simple (I am sure of that) problem...</p> <p>Basically I wanted to start with an algorithm that would give me, on a 2D surface of given height and width of integer values, a local "density value" for any point (defined by integers a &amp; b).</p> <p>The problem I have is, since I want to reuse the result, how to store the data that shows up when the program is started (the data that appears because of the command:</p> <pre><code>//print cout&lt;&lt;D&lt;&lt;endl; </code></pre> <p>I really tried hard to find a solution without finding anything... It could be stored in an external file, or in a kind of "buffer", any good solution would do the thing.</p> <p>I just have to keep this data-list</p> <p>Thanks!</p> <p>here's my code :</p> <pre><code>#include &lt;iostream&gt; #include &lt;fstream&gt; //#include &lt;vector&gt; (the solution??) #include &lt;cstdlib&gt; #include &lt;string&gt; #include &lt;sstream&gt; using namespace std; // constant values float Da=0.1; //densities float Db=0.5; float Dc=1; double Dd=1/3; int l = 99; //width &amp; height int h = 99; float u = 1; // UNIT int main () { float a = 0; float b = 0; // Local variables while (a&lt;l+1, b&lt;h+1){ //values for given a &amp; b double DL = Da-Da*(b/h)+Dc*(b/h); double DR = Db-Db*(b/h)+Dd*(b/h); double D = DL-DL*(a/l)+DR*(a/l); //print cout&lt;&lt;D&lt;&lt;endl; // next pixel &amp; next line a++; if (a&gt;l) { a = 0; b = b+u; } } } </code></pre>
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    1. COYes, `std::vector<double>` is good for this. Declare a variable with a name, just like you've been doing, and then use the `push_back` member to add new data points to it.
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    2. COCould you please be more specific? I tried to use vector without success, I think I didn't get how to use it.
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    3. COI didn't find a good example or tutorial on this topic, any idea? Thanks a lot!
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      1. USadrienlucca.wordpress.com
 

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