Pointer and Array

[Aileen92]

hallo all
This is first time I viset the website,, Actually i'm a IT student .I have a project
abuot class , array and pointer.My question is how I can move between the cells by pointer (new operator)?!.
I hope someone help me .
that all and thanx alot.
Aileen.

[weaknessforcats]

Read this: http://bytes.com/topic/c/insights/77...rrays-revealed

[Aileen92]

Thnx for answer me ,but a class should be able to check if the user refers to an element that
is out of range is boundaries of the specified array,so the columns of array is
different sizes.
could you check this plz:
int *p;
p = new int[3][4];
cout<<*p;

[weaknessforcats]

Not quite correct.

Your array p has 3 elements where each element is an array of 4 int. The new operator returns the address of element 0 of p, which is p[0]. Since the name of an array is the address of element 0, p[0] is the address of an array of 4 int:

int (*p)[4];
 p = new int[3][4];
 cout<< p[0][0];    //element 0 of p[0]

Also remember that all you have is the address of these arrays. There's no way to know how many elements. You will need to keep track of ths using a variable which you provide to all functions that you provide the array address:

const int numrows = 3;
 const int numcols = 4;
 int (*p)[numcols];
 
 p = new int[numrows][numcols];
 MyFunction(p, numrows, numcols);
etc...