double pointer help

[ToLesto]

	mapprinter = new (nothrow) char [mapxc*mapyc+mapyc];
			if (mapprinter==0){
		cout << "error";
		}
	for(int i=0;i<mapyc;i++){
		map[i] = new (nothrow) char [mapxc];
		if (map[i]==0){
		cout << "error";
		}
	}

hmm yea it stops working
i am trying to get memory for the two pointers
map is a double pointerand a char
mapprinter is just a pointer and a char
any tips?

[LB]

This is a double pointer (aka pointer-to-double):

double *MyDoublePointer = new double;
delete MyDoublePointer;

This is a pointer to a pointer to a char (aka pointer-to-pointer-to-char):

char **MyPointerToPointerToChar = new char*;
*MyPointerToPointerToChar = new char;
delete *MyPointerToPointerToChar;
delete MyPointerToPointerToChar;

[ToLesto]

yes but why doesn't this work?

[LB]

What do you mean by "doesn't work"? Does it crash? Does it print "error"? Does it just not do what you want it to do? Does it quit its job and drink alcoholic beverages at the local bar?

[ToLesto]

prints the followin error"Unhandled exception at 0x011a2387 in pathfinding1.exe: 0xC0000005: Access violation writing location 0xcccccccc."
and points to map=0xcccccccc....

[LB]

That means that map is uninitialized.

[ToLesto]

that doesn't make much sense because it is initialized even when i go over it it says char **maps::map
and would it run with out being initialized?

[LB]

This is an uninitialized variable:

int x;


This is an initialized variable:

int x = 0;

[ToLesto]

ahh i get you...
so i need to initialize before creating space?
no way around that?

[o1vk4iN6]

double myLuck = 0.0;
// what 

Sorry I had to, are these features documented anywhere L B ?

[LB]

@xerzi yeah they were documented in one of the old articles on using forum code tags. The numbers can be up to 2⁶³ - 2, for reference:

//
//after this line it breaks 

@ToLesto yes, you have to initialize it to something. In your case you need to initialize it to an array of pointers and then for each pointer initialize it appropriately.