wat is diff b/w *p++ and ++*p?

Question

it is a c language question ask in interview

Answer 1

It is an increment that happens before or after the variable is returned. The * indicates p must be a pointer.

If p is 3, then

p++ will return 3 and then increment p by 1, which means p is 4

++p will increment p by 1, which means p is 4, then return p.

Answer 2

Easy.
One p is in the prefix form and another one is in postfix form.
Let take an example to explain
x=1;
y=++x;
Ans y=2 and then x=2
We first increment x, like y=x+1 where x=1

x=1;
y=x++
Ans y=1 and then x=2
We first check for y since the + sign is found behind x. We put y=1 and then increment x.

Tips: Look for the position of the sign and then calculate. It will help u.

Answer 3

*p++ returns the contents at p and then increments p by the size of the type that p points to.

++*p returns the contents of p incremented by 1.

If char *p = "159"
ch = *p++ would return '1' and then p would = "59"
ch would = '1'

If char *p = "159"
ch = ++*p would increment the value at p
ch would = '2' and p = "259"

Answer 4

*p++ it is add a one to 'p' and then it is return and it will return and then add a one as 'p' is a pointer