Declare a structure variable dat and initialize its name field to "Jonn" and its age field to $20.$ Finally, declare a structure pointer ptr that points to the structure variable dat.

struct Data

$\{$

char name$[21]$;

int age;

$\}$ dat $=\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_$ ;

$\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_*$ptr $=$ &dat;