Who can teach me? - Programmers Heaven

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# Who can teach me?

Posts: 4Member
Explain the steps of determining the value of

• Posts: 6,519Member
[code]
: int x = 6, *p;

[color=Green]/**
Address p is pointed to x
**/[/color]
: p = &x;

[color=Green]/**
First, find out what value is on the right side of
the expression:

++x - first, increment x and THEN USE it in expression
x++ - first, USE x in expression and THEN increment it

1. Incremented x will mean 7
2. 7 must be added to a location pointed by p
3. But, location p points to x, which is now 7
4. 7+7 = 14 (x will be now 14)
**/[/color]
: *p += ++x;
[/code]
• Posts: 4Member

what is the meaning of *p?
(int *p) = p is a pointer to an integer. Rite?

Then, now the answer is 7, your explained is well, i can understand.

But, how become 7+7=14?

: *p += ++x; means what?

Sorry! I'm a stupid...
• Posts: 8Member
this is simple:
*p is the value of pointer p
++x means x=x+1
*p+=++x equivalent to *p=*p+++x or *p=*p+x+1

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• Posts: 770Member ✭✭✭
Undefined behavior.