memory initialisation for 2d pointers, how to??

[cedance]

hi,

suppose i have

#....

main()
{
int n=6;(which means i am to generate a 6*6 matrix)
int **a;

and some how i allocated the memory required for 6*6 to the pointer a....

now, how do i initialise the elements of pointer a to "0" so that i can start accessing them as arrays without any junk values... coz, in my program some values r untouched and if i initialise to "0", it wud be fine, with junk its jus disappointing... i hav heard of memset command for 1d pointers, is it possible ot initialise 2d pointers using the same? thk u.

/cedance

 

[sshahid47]

Hi,
yes you can use memset for 2d pointers, here is how

int arr[10][10];

arr[0][9] = 10;
arr[9][9] = 10;

memset(arr,0,sizeof(int)*10*10);

int a = arr[0][9];
a = 0;
a = arr[9][9];

in your case simply replace the arr with your pointer name, just make sure that you pass the number of bytes correctly to memset depending on the data type of the array you are using.