What is i+++ increment in c++

Question

can anyone tell me what is the process of i+++ increment in c++.

@john: I meant +++ and I'm fully aware of conventional c++ and increment operators. — Biswanath Chowdhury, Mar 08 '11 at 19:10

codaddict · Accepted Answer · 2011-03-08T19:15:04.100

It is a syntax error.

Using the maximum munching rule i+++ is tokenized as:

i ++ +

The last + is a binary addition operator. But clearly it does not have two operands which results in parser error.

EDIT:

Question from the comment: Can we have i++++j ?

It is tokenized as:

i ++ ++ j

which again is a syntax error as ++ is a unary operator.

On similar lines i+++++j is tokenized by the scanner as:

i++ ++ + j

which is same as ((i++)++) + j which again in error as i++ is not a lvalue and using ++ on it is not allowed.

score 17 · Answer 2 · answered Mar 08 '11 at 18:32

17

i+++; will not compile. There is no operator +++ in C++.

i+++j, on the other hand, will compile. It will add i and j and then increment i. Because it is parsed as (i++)+j;

answered Mar 08 '11 at 18:32

Armen Tsirunyan

2

Also note that it'll throw away the result of `i+j` unless you assign it as well. – Mark B Mar 08 '11 at 18:34
@Mark B: If I were you, I'd use the term `throw` with caution as far as C++ is concerned. Took me a couple of seconds to understand you aren't talking about exceptions :) – Armen Tsirunyan Mar 08 '11 at 18:38
actually I am talking about 3 "+" signs that is +++, and want to know their significance. – Biswanath Chowdhury Mar 08 '11 at 19:04
there is no question about exceptions or SEH handlers, I was just asking about the "munching rule" which of of u have specified. You mentioned the first line , which I think I am aware and was naive, but thnx for your replies. – Biswanath Chowdhury Mar 08 '11 at 19:22

score 1 · Answer 3 · answered Mar 08 '11 at 18:33

1

if you mean i++ then its incrementing the value of i once its value has been read. As an example:

int i = 0;   // i == 0
int j = i++; // j == 0, i == 1

answered Mar 08 '11 at 18:33

langerra.com

3 Answers3