Well a "double" pointer (A more accurate term is multidimensional pointer, in this case a two dimensional pointer) is basically a pointer to an array of pointers.
So, int **ptr basically says, ptr is a pointer to an array of pointers. And you can allocate memory to each of these pointers individually. See the image. Heres something interesting. int **ptr; *ptr = new int*[3]; // ptr points to THREE << pointers to integers >> ptr[0] = new int [10]; ptr[1] = new int[23]; ptr[2] = new int[12]; On Sat, Jul 23, 2011 at 1:29 AM, Kamakshii Aggarwal <[email protected]>wrote: > @rakib:can u please explain ur answer > > > On Sat, Jul 23, 2011 at 12:48 AM, Pankaj <[email protected]>wrote: > >> https://ideone.com/tr3Q7 >> >> >> On Sat, Jul 23, 2011 at 12:42 AM, Pankaj <[email protected]>wrote: >> >>> double **p= (double **) malloc(sizeof(double *)); >>> >>> >>> On Sat, Jul 23, 2011 at 12:40 AM, Bhavesh agrawal <[email protected] >>> > wrote: >>> >>>> double pointer mean like **p >>>> >>>> hoe to allocate memory for this >>>> >>>> -- >>>> You received this message because you are subscribed to the Google >>>> Groups "Algorithm Geeks" group. >>>> To post to this group, send email to [email protected]. >>>> To unsubscribe from this group, send email to >>>> [email protected]. >>>> For more options, visit this group at >>>> http://groups.google.com/group/algogeeks?hl=en. >>>> >>> >>> >> -- >> You received this message because you are subscribed to the Google Groups >> "Algorithm Geeks" group. >> To post to this group, send email to [email protected]. >> To unsubscribe from this group, send email to >> [email protected]. >> For more options, visit this group at >> http://groups.google.com/group/algogeeks?hl=en. >> > > > > -- > Regards, > Kamakshi > [email protected] > > -- > You received this message because you are subscribed to the Google Groups > "Algorithm Geeks" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group at > http://groups.google.com/group/algogeeks?hl=en. > -- You received this message because you are subscribed to the Google Groups "Algorithm Geeks" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en.
<<attachment: 2d.jpg>>
