comma-operator Questions
9
Solved
What does the , operator do in C?
Almonte asked 9/9, 2008 at 18:34
6
Solved
#include <stdio.h>
main()
{
int i;
for(i=0; i<0, 5; i++)
printf("%d\n", i);
}
I am unable to understand the i<0, 5 part in the condition of the for loop.
Even if I make it i>0...
Photochronograph asked 18/10, 2012 at 16:33
3
Solved
In the following type of code is there a sequence point between each variable construction, or is the result undefined?
int a = 0;
int b = a++, c = a++;
I wasn't able to find in the standard a s...
Fadden asked 20/6, 2011 at 15:55
3
Solved
I was reading C Programming Language and found this sentence:
The commas that separate ... variables in declarations ... are not comma operators, and do not guarantee left to right evaluation.
...
Popelka asked 10/9, 2016 at 23:14
1
The title should clarify what my confusion is about. I'd like to use this question to get a comprehensive answer which helps me understand how the comma operator works with decltype within SFINAE c...
Sphagnum asked 28/9, 2021 at 18:11
2
Solved
From this former question When all does comma operator not act as a comma operator?, I understood that commas inside a function call can only act as expression sperator. But from the code below, it...
Herzberg asked 19/12, 2017 at 13:38
15
Solved
I read this question about the "comma operator" in expressions (,) and the MDN docs about it, but I can't think of a scenario where it is useful.
So, when is the comma operator useful?
Springing asked 6/3, 2012 at 7:27
1
The 2nd edition of C++ Templates - The Complete Guide features the following footnote at page 436 (my bold):
Except that decltype(call-expression) does not require a nonreference, non-void return ...
Agnola asked 27/9, 2021 at 20:4
2
Solved
Talk is cheap; show me the code.
// equals to this.test = "inside window"
var test = "inside window";
function f () {
console.log(this.test)
};
var obj = {
test: "inside object",
fn: f
}...
Externality asked 4/9, 2020 at 8:51
2
Solved
I am quite confused with the comma operator. I have never seen such code with such syntax? but I am curious if it useful at any place? why is it deprecated in c++20?
#include <iostream>
int m...
Confessedly asked 20/7, 2020 at 16:42
1
Solved
it's known that to declare multiple variables, one uses a format like:
let k = 0,
j = 5 /*etc....*/
It's also known that to execute multiple statements in one line (which is useful for arrow fu...
Galligaskins asked 7/4, 2020 at 10:32
1
Solved
Looking at std::for_each_n's possible implementation:
template<class InputIt, class Size, class UnaryFunction>
InputIt for_each_n(InputIt first, Size n, UnaryFunction f)
{
for (Size i...
Frill asked 18/2, 2020 at 13:28
7
Solved
With reference to Comma-Separated return arguments in C function [duplicate]
,
x=x+2,x+1;
will be evaluated as
x=x+2;
However, in case of the following code
#include<stdlib.h>
#inclu...
Betweenwhiles asked 14/9, 2019 at 20:32
2
Solved
This seems such a simple question, but something I've not examined for ages in my own style... When initializing variables separated by a comma, I've assumed the following to be an unsafe practice:...
Merits asked 15/1, 2019 at 13:55
1
Solved
Consider a simple example:
int foo() {
return 3;
}
template <int>
struct Bar {};
int a;
int main() {
int b;
//Bar<((void)foo(), 1)> bar1; //case 1. compilation error as expected
...
Counterscarp asked 3/12, 2018 at 18:28
11
Solved
I see questions on SO every so often about overloading the comma operator in C++ (mainly unrelated to the overloading itself, but things like the notion of sequence points), and it makes me wonder:...
Squelch asked 9/4, 2011 at 0:45
3
I can write the code if(1) x++, y++; instead of if(1) {x++; y++;}, but in some cases it does not work (see below). It would be nice if you tell me about this.
int x = 5, y = 10;
if (x == 5) x++, ...
Ruella asked 21/8, 2018 at 6:38
1
Solved
I'm trying to understand how the comma operator (,) works in JavaScript,
it seems to have a different behaviour when it's not put between parenthesis.
Can someone explain me why ?
Exemple...
Shocking asked 4/6, 2018 at 10:31
1
Solved
Using Paul Fultz II's solution in the post C-preprocessor recursive macro, I'd like to expand an unlimited number of parenthesized macro arguments, e.g.
#define MY_CHAIN (alpha) (beta) (gamma)
...
Diathermic asked 12/3, 2018 at 12:45
4
Solved
I wrote the code about sizeof operator. If I write something like:
#include <stdio.h>
int main() {
char a[20];
printf("%zu\n", sizeof(a));
return 0;
}
Output:
20 // Ok, it's fin...
Cymric asked 18/10, 2017 at 9:38
3
Solved
#include<stdio.h>
int main(void) {
int a;
a = (1, 2), 3;
printf("%d", a);
return 0;
}
output: 2
Can any one explain how output is 2?
Erlond asked 12/9, 2017 at 13:6
9
I came across a for-loop in code that looks like this:
for ( argc--, argv++; argc > 0; argc--, argv++ )
How does it work? Normally a for loop looks like this:
for (initialization; condition...
Wolsey asked 17/8, 2017 at 11:37
2
Solved
consider the following example program:
#include <iostream>
using namespace std;
struct t
{
~t() {cout << "destroyed\n"; }
};
int main()
{
cout << "test\n";
t(), cout <<...
Diagnostics asked 1/6, 2017 at 13:52
3
Solved
I'm putting together a C++-based assignment for a class I'm teaching. I have a function I'm exporting to students that I'd like them to call at various points in their program so that, during gradi...
Jaconet asked 19/1, 2017 at 18:35
3
Solved
Prog 1:
#include<stdio.h>
int main()
{
int i=0;
while(i<=8,i++);
printf("%d",i);
return 0;
}
Prog 2:
#include<stdio.h>
int main()
{
int i=0;
while(i++,i<=8);
...
Lamppost asked 12/1, 2017 at 11:5
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