C++: Having troubles with functions and dynamic memory alloc

/*

×××××××××××××××
Datamembers:
-mysiLength
-mysiWidth
-mysiArea
_______________
+constructor
+mysiArea getter
+toString
×××××××××××××××

*/

#include <iostream>

using namespace std;

#include <string>
#include <sstream>
#include <algorithm>

class Rectangle
{
private:
    short mysiLength;
    short mysiWidth;
    long myliArea;
    short abs(short siArg)
    {
        if(siArg<0)
            siArg=-siArg;

        return siArg;
    }

public:
    Rectangle(short siLength=0, short siWidth=0)
    {
        mysiLength=abs(siLength);
        mysiWidth=abs(siWidth);
        myliArea=mysiWidth*mysiLength;
    }

    long getArea()
    {
        return myliArea;
    }

    string toString()
    {
        stringstream ss;

        ss << myliArea << "=" << mysiLength << "*" << mysiWidth << endl;

        return ss.str();
    }
};

void io(short*, short*);
void manage_Rectangle_arr(string, Rectangle * *, short*);

int main()
{
    Rectangle * * arr;
    short siArrayL=1;

    manage_Rectangle_arr("make array", arr, &siArrayL);
    //manage_Rectangle_arr("fill array", arr, &siArrayL);
    //manage_Rectangle_arr("get areas", arr, &siArrayL);
    //manage_Rectangle_arr("empty contents", arr, &siArrayL);
    manage_Rectangle_arr("delete array", arr, &siArrayL);
}

void io(short* siArg0, short*siArg1)
{
    cout << "Length: ";
    cin >> *siArg0;
    cout << "Width: ";
    cin >> *siArg1;
}

void manage_Rectangle_arr(string strCommand, Rectangle * *arr, short *siArrayL)
{
    if(strCommand=="make array")
    arr = new Rectangle * [ *siArrayL];

    if(strCommand=="fill array")
    for(short s=0; s< *siArrayL; ++s)
    arr[s]= new Rectangle(1, 1);

    if(strCommand=="get areas")
    for(short s=0; s< *siArrayL; ++s)
    cout << arr[s]->getArea();

    if(strCommand=="empty contents")
    for(short s=0; s< *siArrayL; ++s)
    delete arr[s];

    if(strCommand=="delete array")
    delete [] arr;
}