pointers

[geekocoder]

Assume the following C variable declaration
int *A [10];
I have a doubt whether A[2][3] is valid or not??

[shacktar]

Well it depends on what is at A[2].

For instance, the following would be valid:

A[2] = (int*) malloc(3 * sizeof(int));

//access A[2][3] (valid)
A[2][3] = 17;

while the following would not:

int x = 5;
A[2] = &x;

//access A[2][3] (not valid. undefined behavior)
A[2][3] = 17;