array pointer and pointer array

#define COLS 5 /* assume array size = 5*/

int (*xptr)[COLS];  /* this is an array's pointer */

int *xptr[COLS]; /* this is a pointer array */

illustrate a[x] means *(a+x) equals *(x+a) equals x[a]

code:

int main(void)

{

char a[4]="123";

a[2]='x';

puts(a);

2[a]='y';

puts(a);

return 0;

}

executive result:

12x

12y