C++ 申请一个动态三维数组

#include<iomanip>
#include <iostream>
using namespace std;
int main()
{
	int i,j,k;  
	int nWidth,nHeight,nThird;  
  
	cin>>nThird>>nHeight>>nWidth;  
  
	/***声明一个三维数组***/
	int ***grayScale = new int ** [nThird];  
	for (i = 0;i < nThird;i++)  
	{  
		grayScale[i] = new int*[nHeight];  
		for (j = 0;j < nHeight;j++)  
		{  
			grayScale[i][j] = new int [nWidth];  
		}  
	}  
	/***将数组元素都赋值为1***/
	for (k = 0;k < nThird;k++)  
	{  
		for (j = 0;j < nHeight;j++)  
		{  
			for (i = 0;i < nWidth;i++)  
			{  
				grayScale[k][j][i] = 1;  
			}  
		}  
	}  
	/***打印数组元素***/
	cout<<setw(5);  
	for (k = 0;k < nThird;k++)  
	{  
		for (j = 0;j < nHeight;j++)  
		{  
			for (i = 0;i < nWidth;i++)  
			{  
				cout<<grayScale[k][j][i]<<setw(5);  
			}  
			cout<<endl;  
		}  
		cout<<endl;  
	}
	/***释放内存***/
	for (j = 0;j < nThird;j++)  
	{  
		for (i = 0;i < nHeight;i++)  
		{  
			delete []grayScale[j][i];  
		}  
	}  
	delete []grayScale;  
	return 0;
}