Переделать C++ под Си

#include "stdafx.h"
#include <iostream>
#include <iomanip>
#include <ctime>
using namespace std;
 
int main()
{
    srand(time(0));
    unsigned rows, col;
    cout << "rows: ";
    cin >> rows;
    cout << "columns: ";
    cin >> col;
    double ** arr = new double *[rows], * rows_avg_arithm = new double[rows];
    for (unsigned i = 0; i < rows; ++i)
    {
        arr[i] = new double[col];
        rows_avg_arithm[i] = 0.0;
        for (unsigned j = 0; j < col; ++j)
        {
            cout << setw(7) << ( arr[i][j] = rand() % 20 );
            rows_avg_arithm[i] += arr[i][j];
        }
        rows_avg_arithm[i] /= col;
        cout << endl;
    }
    cout << endl;
    cout.precision(3);
    for (unsigned i = 0; i < rows; ++i)
    {
        for (unsigned j = 0; j < col; ++j)
            cout << setw(7) << ( arr[i][j] -= rows_avg_arithm[i] );
        cout << endl;
    }
    cout << endl;
    system("pause");
}