2楼: Originally posted by 绿遍山原 at 2014-10-15 14:12:49
//分配内存
int *ptr = new int ;
int **mat = new int *;
for (int i = 0; i < dim; i++) mat = &ptr;
// 初始化
memset(mat, 0, dim*dim*sizeof(int));
// 释放
delete [] mat;
delete [] mat;
...

//分配内存
int *ptr = new int [dim*dim];
int **mat = new int *[dim];
for (int i = 0; i < dim; i++) mat[i] = &ptr[i*dim];
// 初始化
memset(mat[0], 0, dim*dim*sizeof(int));
// 释放
delete [] mat[0];
delete [] mat;

2楼: Originally posted by 绿遍山原 at 2014-10-15 14:12:49
//分配内存
int *ptr = new int ;
int **mat = new int *;
for (int i = 0; i < dim; i++) mat = &ptr;
// 初始化
memset(mat, 0, dim*dim*sizeof(int));
// 释放
delete [] mat;
delete [] mat;
...

3楼: Originally posted by martialvv at 2014-10-15 16:51:22
谢谢，很给力，我测试成功了。只是有一点不太理解，就是释放内存的那两句，为什么只释放mat[] 就可以，而不用释放 mat[] i从1到dim-1 ?
我看别人的程序是直接对于ptr操作，我理解这段程序就是分配个dim*dim的内存 ...