alloc 2d array with new

[aurgathor]

I'm trying to allocate a 2d array in runtime
that can subsequently be accessed like
arr[x][y], to no avail. Is there any to
do that in C++? If yes, how?

TIA

This is what I got thus far:

#include <iostream>

struct sq_T {
short X;
short Y;
int ID;
};

void maker ( int x, int y ) {
sq_T *display = new sq_T[x*y];

// test code
for (int j = 0; j < y; j++)
for (int i = 0; i < x; i++)
display[(j * x) + i].ID = i + (j*x);

for (int j = 0; j < y; j++) {
for (int i = 0; i < x; i++) {
cout << display[(j * x) + i].ID << " ";
}
cout << endl;
}
}


void main () {
maker(5,7);
}

 

[Victor Bazarov]

I'm trying to allocate a 2d array in runtime
that can subsequently be accessed like
arr[x][y], to no avail. Is there any to
do that in C++? If yes, how?
[..]

This is covered in the FAQ (http://www.parashift.com/c++-faq-lite/)

 

[Michael Mair]

I'm trying to allocate a 2d array in runtime
that can subsequently be accessed like
arr[x][y], to no avail. Is there any to
do that in C++? If yes, how?

Start at
http://www.parashift.com/c++-faq-lite/freestore-mgmt.html#faq-16.16
and read also the next couple of FAQs.

-Michael

 

[aurgathor]

Start at
http://www.parashift.com/c++-faq-lite/freestore-mgmt.html#faq-16.16
and read also the next couple of FAQs.

Thanks, I guess it would've taken a little time to figure all that out.

 

[Axter]

I'm trying to allocate a 2d array in runtime
that can subsequently be accessed like
arr[x][y], to no avail. Is there any to
do that in C++? If yes, how?

TIA

This is what I got thus far:

#include <iostream>

struct sq_T {
short X;
short Y;
int ID;
};

void maker ( int x, int y ) {
sq_T *display = new sq_T[x*y];

// test code
for (int j = 0; j < y; j++)
for (int i = 0; i < x; i++)
display[(j * x) + i].ID = i + (j*x);

for (int j = 0; j < y; j++) {
for (int i = 0; i < x; i++) {
cout << display[(j * x) + i].ID << " ";
}
cout << endl;
}
}


void main () {
maker(5,7);
}

Check out the following link:
http://www.tek-tips.com/faqs.cfm?fid=5575

It has several more efficient methods for creating 2D array.