如何申请指针的指针的内存空间

[bigmarten]

如何申请指针的指针的内存空间？

double *temp = new double[100];
double **a = (double**)temp;

可否，还有其他办法嘛？

[piaozi2003]

这要看你为什么要用指针的指针了，一般指针的指针常用来定义数组指针

[whoho]

这样才对
double **a = &temp;

[beyondtkl]

char **p;
p = new char*[100];
for (int i=0; i <100; ++i)
{
p[i] = new char[100];
}

[oyljerry]

**一般为二维数组

[avalonBBS]

#define N 1000
typedef char T;
T **p;
int i;
p = (T **)malloc( N * sizeof(T *));
for (i=0; i <N; ++i)
p[i] = new char[100];

[xiaoqiang085]

二维指针不能那样申请

[avalonBBS]

弄错了：（

#define N 1000
typedef char T;
T **p;
int i;
p = (T **)malloc( N * sizeof(T *));
for (i=0; i <N; ++i)
p[i] = (T *)malloc( N * sizeof(T) );

[bigmarten]

double **p;
p = new double* [100];
是这样，谢谢。

[lovefly_fanny]

////二维空间的申请，多维类似···
cosnt int m=10;
const int n=10;
int **p=new int *[m];
for(int i=0; i<m; i++)
p[i]=new int[n];
////do some operation
````such as p[0][1]=1;
for(intj=0; j<m; j++)
delete [](p[j]);
delete []p;

[suyouxin]

char** dp;
char* p;

*p = dp;

p = (char*)mallco(sizeof(char) * 1024);

[suyouxin]

写反了

char** dp;
char* p;

*dp = p;

p = (char*)mallco(sizeof(char) * 1024);