Void pointer in c++
In c++
int main() {
int i = 99;
void* vp = &i;
*vp = 3; }
Why there is compile time error at line 4.
[AMAZON] Vertical sum of nodes
Given a Binary Tree, find vertical sum of the nodes that are in same vertical line. Print all sums through different vertical lines. Examples: 1 / \ 2 3 / \ / \ 4 5 6 7 The tree has 5 vertical lines Vertical-Line-1 has only one node 4 => vertical sum is 4 Vertical-Line-2: has only one node 2=> vertical sum is 2 Vertical-Line-3: has three nodes: 1,5,6 => vertical sum is 1+5+6 = 12 Vertical-Line-4: has only one node 3 => vertical sum is 3 Vertical-Line-5: has only one node 7 => vertical sum is 7 So expected output is 4, 2, 12, 3 and 7
*vp = 3;
ReplyDeletevp is a void pointer. pointing to void. not an integer pointer. so cant assign an integer at the location pointed by void pointer.?
@Ramesh yes you can assign value at it.But Void pointer can be used to point at any kind of variable but on dereferencing you must cast it.
ReplyDeleteeg : In above case *((int*)vp) = 3 will work.try it..
@priyaranjan u said dat u can assign value at it but again u r saying dat u hav to dereference it. i think its a conflict dude. when u r typecasting something it no longer behaves like a void pointer.
ReplyDelete@above please elaborate what you want to say...
ReplyDelete