C++ bad dynamic memory

[Quarternions]

I have a problem with dynamic memory and I get these errors, I fixed them before but I can't remember how :S

First-chance exception at 0x75af42eb in Test.exe: Microsoft C++ exception: std::bad_alloc at memory location 0x0023fb68..
First-chance exception at 0x010b227b in Test.exe: 0xC0000005: Access violation writing location 0x00000000.
Unhandled exception at 0x010b227b in Test.exe: 0xC0000005: Access violation writing location 0x00000000.

[cpp]
// map.hpp
#ifndef MAP
#define MAP

#include <iostream>
#include <new>

class Map
{
private:
int Width,Height;
int * map;
public:
Map(int W,int H);
void SetHeight(int x,int y,int height);
void Showmap();
};

#endif
// map.cpp
#include "map.hpp"

Map::Map(int W, int H)
{
map = new (std::nothrow) int[Width*Height];
Width = W;
Height = H;
for (int n=0; n<Height; n++)
{
for (int m=0; m<Width; m++)
{
map[n*Width+m] = 0;
}
}
}

void Map::SetHeight(int x,int y,int height)
{

}

void Map::Showmap()
{
for (int n=0; n<Height; n++)
{
for (int m=0; m<Width; m++)
{
std::cout<< map[n*Width+m];
}
std::cout << std::endl;
}
}
// main.cpp
#include <iostream>
#include <stdlib.h>
#include <time.h>
#include "map.hpp"

int random(int start,int stop)
{
return rand() % stop + start;
}

int main()
{
int Height,Width;
srand(time(NULL));

std::cout << "Map Generator !" << std::endl << std::endl;
std::cout << "Input the number height and lenght" << std::endl;
std::cout << "Height : ";
std::cin >> Height;
std::cout << std::endl << "Width : ";
std::cin >> Width;

Map map (Width, Height);

std::cout << "Press any key to continue...";
std::cin.ignore();
std::cin.get();

return 1;
}
[/cpp]

[MultiPurpose]

map = new (std::nothrow) int[Width*Height];  

You have not set width and height to anything yet.

[Quarternions]

Thanks, Fucking noob mistake

[gparent]

Why would you use nothrow if you aren't going to check for errors? That's the biggest mistake you've made, IMO.