Pointers

[Lego_TeCh]

If I let p be a pointer attached to the first element of an integer array. Could someone explain the difference between the C operators (*p)++ and *(p++)?

cheers

[laserlight]

What is the difference between *p and p++?

[abraham2119]

I'm assuming your question is a doubt concerning the other thread you posted.

Basically, when doing:

int *p = arr;

The pointer 'p' is pointing to the array's first element's address. When doing:

(*p)++

You are not referring to the pointer's address, rather to its value, which is insignificant to us at this point. Because, you are dereferencing the pointer. The other way (*(p++)), you are actually referencing the array's address and summing one to it, which would lead the array to return the next element in the array.

[MK27]

(*p)++

Add one to the value at p.

*(p++)

Give the value at p, then add one unit to the address of p, a unit being the size of the datatype.