postfix-operator Questions

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One of the tips for jslint tool is: ++ and -- The ++ (increment) and -- (decrement) operators have been known to contribute to bad code by encouraging excessive trickiness. They are second only to...
Blanketing asked 9/6, 2009 at 17:2

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I can't get my head around why the code below is not working as expected: #include <stdio.h> int main() { int i = 0, size = 9, oneOrZero[] = {1,1,1,1,1,1,1,1,0}; while (i < size &&a...
Jayejaylene asked 12/10, 2020 at 8:54

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The following code prints a value of 9. Why? Here return(i++) will return a value of 11 and due to --i the value should be 10 itself, can anyone explain how this works? #include<stdio.h> mai...
Markitamarkka asked 11/8, 2011 at 18:59

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Although this question might be answered somewhere and I could not find it. Below written first statement work whereas second does not? WHY? int main() { int x = 1, y = 2; int *p = &++x; /...

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Today I stumbled over a C riddle that got a new surprise for me. I didn't think that -1[p] in the example below would compile, but it did. In fact, x ends up to be -3. int x; int array[] = ...
Mercantile asked 14/8, 2019 at 17:18

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I am working with the C operator precedence table to better understand the operator precedence of C. I am having a problem understanding the results of the following code: int a, b; a = 1; b = a++...
Callie asked 6/2, 2019 at 20:24

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In the Perl doc, there is a section about .postfix/.postcircumfix, it says that In most cases, a dot may be placed before a postfix or postcircumfix: my @a; @a[1, 2, 3]; @a.[1, 2, 3]; # Same ...
Competency asked 5/5, 2018 at 12:2

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I have just got the following warning from clang-tidy: overloaded "operator++" returns a non-constant object instead of a constant object type https://clang.llvm.org/extra/clang-tidy/checks/ce...
Intrigue asked 18/10, 2018 at 9:28

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However It is clearly written in precedence table that postfix operator has higher priority than prefix. But still I have a daubt. I start with following example: *ptr++; // evaluate as *(pt...
Bobbitt asked 4/7, 2014 at 17:53

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Have a look at these function signatures: class Number { public: Number& operator++ (); // prefix ++ Number operator++ (int); // postfix ++ }; Prefix doesn't take any parameter but pos...

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I read from the official tutorial of Java that prefix and postfix ++ -- have different precedences: postfix: expr++ expr-- unary: ++expr --expr +expr -expr ~ ! Operators According to the t...
Joannejoannes asked 16/6, 2011 at 14:58

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I am writing my own array class as an exercise. Since, I read non-member functions are actually better in some ways than member functions. (Scott Meyers) I am trying to write as many operator ove...

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I was wondering why the following outputs 7 7 6 7 instead of 5 6 6 7 my $a = 5; printf("%d %d %d %d",$a,++$a , $a++ , $a); I'm pretty sure it has something to do with the order of parameters com...
Perpetual asked 15/5, 2013 at 16:31

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Currently I'm teaching a class of C++ programmers the basics of the C# language. As we discussed the topic operators I used C# standard categories of primary, unary etc. operators. One of the atte...
Sebastian asked 13/8, 2011 at 8:26

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While looking into Can you have a incrementor and a decrementor on the same variable in the same statement in c I discovered that you can have several prefix increment/decrement operators on a sin...
Ketone asked 26/7, 2012 at 23:28

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It's necessary to use a postfix delimiter to denote the type of constant being used in the source code, like L for long. However, for shorts and bytes there are no delimiters, so I need to explicit...
Voluptuous asked 18/11, 2011 at 3:47

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Because I've overloaded the operator++ for an iterator class template<typename T> typename list<T>::iterator& list<T>::iterator::operator++() { //stuff } But when I try to...
Diaconate asked 21/5, 2009 at 19:55

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Defined this way, we can do neither ++x++ nor ++x--. But on the other hand, both (++x)++ and (++x)-- are useful expressions: (++x)++ increments x by two and returns the value "in the middle", while...

4

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I compiled the following example: #include <iostream> #include <iterator> using namespace std; class myiterator : public iterator<input_iterator_tag, int> { int* p; public: my...

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Possible Duplicate: What does a type followed by _t (underscore-t) represent? While typing in my IDE (Xcode), autocomplete pops up already-defined words when I'm partway thru entering s...
Haiti asked 8/9, 2009 at 0:42

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I am trying to show by example that the prefix increment is more efficient than the postfix increment. In theory this makes sense: i++ needs to be able to return the unincremented original value a...
Hudibrastic asked 12/7, 2009 at 19:40
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