C++三维数组的动态申请

类似,将指向二维地址的指针,装进一个数组即可

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<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;
}

includeinclude

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<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;
}

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{

for (j = 0;j < nHeight;j++)
{

for (i = 0;i < nWidth;i++)  
{  
    cout<<grayScale[k][j][i]<<setw(5);  
}  
cout<<endl;  

}
cout<}
/释放内存/
for (j = 0;j < nThird;j++)
{

for (i = 0;i < nHeight;i++)
{

delete []grayScale[j][i];  

}
}
delete []grayScale;
return 0;
}

//多维数组开空间

#if 1
#include 
#include

void print3Dmatrix(int D3_num,int n,int m, int l) //以D3_num形式将D3_num的首地址传入
{
int i,ii,iii;
printf("\n3D matrix is: \n");
for (i=0;i<n;i++){
printf("[]\n",i);
for (ii=0;ii<m;ii++){

        for (iii=0;iii<l;iii++){
            printf("%.3d ",D3_num[i][ii][iii]);
        }
        printf("\n");
    }
}
}

int **D3ToD2(int ***D3_num) //int **表示返回的是一个二级指针
{
int **D2_num;
D2_num=D3_num[0];//D3_num是一个三级指针，D3num[0]是一个二级指针，D3num[0][0]是一个一级指针
return D2_num;
}

void print2Dmatrix(int **D2_num,int m, int l)
{
int ii,iii;
printf("\n2D matrix is:\n");
for (ii=0;ii<m;ii++){

        for (iii=0;iii<l;iii++){
            printf("%.3d ",D2_num[ii][iii]);
        }
        printf("\n");
    }
}

int main()
{
int i,ii,iii;//初始化参数
int n=2,m=3,l=4; //三维数组长度

int ***D3_num;    //声明一个三级指针
D3_num=(int***)malloc(n*sizeof(int**));    //分配空间，该三级指针指向n个二级指针
for (i=0;i<n;i++){
    D3_num[i]=(int**)malloc(m*sizeof(int*));//分配空间，每个二级指针又指向m个一级指针
    for (ii=0;ii<m;ii++){
        D3_num[i][ii]=(int*)malloc(l*sizeof(int));//分配空间，每个一级指针指向长度为l的一维数组
        for (iii=0;iii<l;iii++){
            D3_num[i][ii][iii]=(i+1)*(ii+2)*(iii+3);//为每个数组赋值，这里D3_num[i][ii][iii]的形式与我们平常用三维数组的形式一致
            //但实际D3_num[i][ii][iii]是一种简写，C编译器解释起来是 *(*(*(p+i)+ii)+iii),所以可以直接赋值
        }            
    }
}

print3Dmatrix(D3_num,n,m,l);//输出D3_num内容，这里直接将D3_num作为三级指针输入

int **D2_num; //三级指针可以表示三维数组，二级指针自然就表示二维数组了:D
D2_num=D3ToD2(D3_num);//D3ToD2返回一个二级指针，与D2_num匹配

print2Dmatrix(D2_num,m,l);
getchar();
return 0;
}
#endif