declaring 2d dynamic array c 2b 2b

1int** a = new int*[rowCount];
2for(int i = 0; i < rowCount; ++i)
3    a[i] = new int[colCount];

1int** arr = new int*[10]; // Number of Students
2int i=0, j;
3for (i; i<10; i++) 
4	arr[i] = new int[5]; // Number of Courses
5/*In line[1], you're creating an array which can store the addresses
6  of 10 arrays. In line[4], you're allocating memories for the 
7  array addresses you've stored in the array 'arr'. So it comes out 
8  to be a 10 x 5 array. */