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Generating a Random Number Array in a Given Range in C

++ <div> <h1>Generating a Random Number Array in a Given Range in C++</h1> <p>Random numbers are an essential part o...



<h1>Generating a Random Number Array in a Given Range in C++</h1>

<p>Random numbers are an essential part of programming, and being able to generate them within a given range is a common requirement. In this article, we will explore how to generate a random number array in a given range using C++.</p>

<h2>The Basics of Random Number Generation</h2>

<p>Before we dive into the specifics of generating a random number array, let's first understand the basics of random number generation in C++. The standard library <code>random</code> header provides functions for generating pseudo-random numbers, which are numbers that appear to be random but are actually determined by a fixed algorithm. These functions are based on the <code>random_device</code> class, which uses a hardware source of entropy to produce a more unpredictable sequence of numbers.</p>

<p>To generate random numbers within a given range, we will use the <code>uniform_int_distribution</code> class, which produces evenly distributed integers within a specified range. This class requires two parameters - the minimum and maximum values of the desired range.</p>

<h2>Generating a Random Number Array</h2>

<p>Now that we have a basic understanding of random number generation in C++, let's see how we can use it to create a random number array within a given range. The steps involved are:</p>


<li>Include the <code>random</code> header in your program.</li>

<li>Create a <code>random_device</code> object to generate a seed for the random number engine.</li>

<li>Create a <code>mt19937</code> object as the random number engine, passing in the seed from the <code>random_device</code>.</li>

<li>Define a <code>uniform_int_distribution</code> object, specifying the range of values you want in your array.</li>

<li>Create an array of the desired size.</li>

<li>Loop through the array and use the <code>uniform_int_distribution</code> object to assign random values to each element.</li>


<p>Let's see the above steps in action with an example:</p>


#include &lt;random&gt;

#include &lt;iostream&gt;

using namespace std;

int main() {

// create random device

random_device rd;

// create random number engine

mt19937 rng(rd());

// define uniform distribution object with range 1 to 10

uniform_int_distribution&lt;int&gt; dist(1, 10);

// create array of size 5

int arr[5];

// fill array with random values

for (int i = 0; i &lt; 5; i++) {

arr[i] = dist(rng);


// print array

for (int i = 0; i &lt; 5; i++) {

cout &lt;&lt; arr[i] &lt;&lt; " ";


return 0;


<p>Running this program will output something like: <code>7 3 5 9 2</code>, a random array of size 5 with values ranging from 1 to 10.</p>

<h2>Customizing the Code for Different Ranges</h2>

<p>The code above can be easily modified to generate random number arrays within different ranges. Simply change the values passed to the <code>uniform_int_distribution</code> object to your desired range. For example, if you want to generate numbers between 50 and 100, you would use <code>uniform_int_distribution&lt;int&gt; dist(50, 100)</code>.</p>


<p>In this article, we have learned how to generate a random number array in a given range using C++. By using the <code>random</code> header and the <code>uniform_int_distribution</code> class, we can easily generate pseudo-random numbers within any desired range. This knowledge can be useful in a variety of programming applications, from creating randomized data sets for testing to implementing game mechanics that rely on random number generation.</p>


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