How would you convert this C++ program to a C program? : <p>Thank you for your time in advance, I'm struggling on how to turn this code into C language, I'm just starting in the programming world, so if you have any doubt, I can answer, this is the code... </p>

<pre><code>// C++ program for implementation of Heap Sort 
#include &lt;iostream&gt; 

using namespace std; 

// To heapify a subtree rooted with node i which is 
// an index in arr[]. n is size of heap 
void heapify(int arr[], int n, int i) 
{ 
    int largest = i; // Initialize largest as root 
    int l = 2*i + 1; // left = 2*i + 1 
    int r = 2*i + 2; // right = 2*i + 2 

    // If left child is larger than root 
    if (l &lt; n &amp;&amp; arr[l] &gt; arr[largest]) 
        largest = l; 

    // If right child is larger than largest so far 
    if (r &lt; n &amp;&amp; arr[r] &gt; arr[largest]) 
        largest = r; 

    // If largest is not root 
    if (largest != i) 
    { 
        swap(arr[i], arr[largest]); 

        // Recursively heapify the affected sub-tree 
        heapify(arr, n, largest); 
    } 
} 

// main function to do heap sort 
void heapSort(int arr[], int n) 
{ 
    // Build heap (rearrange array) 
    for (int i = n / 2 - 1; i &gt;= 0; i--) 
        heapify(arr, n, i); 

    // One by one extract an element from heap 
    for (int i=n-1; i&gt;=0; i--) 
    { 
        // Move current root to end 
        swap(arr[0], arr[i]); 

        // call max heapify on the reduced heap 
        heapify(arr, i, 0); 
    } 
} 

/* A utility function to print array of size n */
void printArray(int arr[], int n) 
{ 
    for (int i=0; i&lt;n; ++i) 
        cout &lt;&lt; arr[i] &lt;&lt; " "; 
    cout &lt;&lt; "\n"; 
} 

// Driver program 
int main() 
{ 
    int arr[] = {12, 11, 13, 5, 6, 7}; 
    int n = sizeof(arr)/sizeof(arr[0]); 

    heapSort(arr, n); 

    cout &lt;&lt; "Sorted array is \n"; 
    printArray(arr, n); 
}
</code></pre>

<p>After that, I would have to add another function, but thats a story for another day, being able to convert it would help me a lot on starting to use C++. Also, which one should I try to specialize on first? English isn't my main language, sorry if I have some mistakes.</p>
