9. Pointers vs. Multidimensional Arrays
Newcomers to C are sometimes confused about the difference between a two-dimensional array and    an array of pointers.
int a[10][20];
int *b[10];
– a is a true two-dimensional array: 200 int-sized locations have been set aside, and the conventional    rectangular subscript calculation 20 * row +col is used to find the element a[row,col].
– b is the definition only allocates 10 pointers and does not initialize them. The important advantage    of the pointer array is that the rows of the array may be of different lengths.
char *name[] = { "Illegal month", "Jan", "Feb", "Mar" };
char aname[][15] = { "Illegal month", "Jan", "Feb", "Mar" };
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