how to make a random in c++ program : <p>I am want to make  my program  to choose a random number </p>

<pre><code> #include &lt;iostream&gt;
   using namespace std;
   int main(){
   int x=100 y=40;
   while (true)
     {if(x&gt;y)
       {x--;}
     else
       {break;}}}
</code></pre>
