Runtime error in the following code

Question

The following code,according to me should run successfully,but fails at runtime.I don\'t get the reason:

 void main()
 {
   int arr[5][3]={1,2,3,4,5,6,7,8,9,10,1         


        

Answer 1

An array of arrays and a pointer to a pointer is quite different, and can't be used interchangeably.

For example, if you look at your array arr it looks like this in memory

+-----------+-----------+-----------+-----------+-----+-----------+
| arr[0][0] | arr[0][1] | arr[0][2] | arr[1][0] | ... | arr[4][2] |
+-----------+-----------+-----------+-----------+-----+-----------+

When you have the pointer-to-pointer p the program don't really knows that it points to an array of arrays, instead it's treated as an array of pointers, which looks like this in memory:

+------+------+------+-----+
| p[0] | p[1] | p[2] | ... |
+------+------+------+-----+
  |      |      |
  |      |      v
  |      |      something
  |      v
  |      something
  v
  something

So when you do p + 1 you get to p[1] which is clearly not the same as arr[1].