Once you attempt the question then PrepInsta explanation will be displayed.
int *ptr; /* Note: the use of * here is not for dereferencing,
it is for data type int */
;
ptr = &x; /* ptr now points to x (or ptr is equal to address of x) */
= 0; /* set value ate ptr to 0 or set x to zero */
f(" x = %d\n", x); /* prints x = 0 */
printf(" *ptr = %d\n", *ptr); /* prints *ptr = 0 */
+= 5; /* increment the value at ptr by 5 */
printf(" x = %d\n", x); /* prints x = 5 */
printf(" *ptr = %d\n", *ptr); /* prints *ptr = 5 */
(*ptr)++; /* increment the value at ptr by 1 */
printf(" x = %d\n", x); /* prints x = 6 */
printf(" *ptr = %d\n", *ptr); /* prints *ptr = 6 */