associativity Questions
6
Solved
Introduction
In every textbook on C/C++, you'll find an operator precedence and associativity table such as the following:
http://en.cppreference.com/w/cpp/language/operator_precedence
One of the ...
Comyns asked 24/12, 2013 at 23:27
2
Solved
I have the following function:
pub fn s_v1(n: &u64) -> u64 {
let mut x: u64 = 1;
for i in 1..=*n {
x = x * (*n + i) / i;
}
x
}
This code gives the correct answer for s_v1(&20) ==...
Cchaddie asked 9/8, 2022 at 4:49
5
Solved
I had a problem when I was adding three floating point values and comparing them to 1.
cout << ((0.7 + 0.2 + 0.1)==1)<<endl; //output is 0
cout << ((0.7 + 0.1 + 0.2)==1)<<e...
Maravedi asked 29/4, 2012 at 11:46
1
Solved
On the one hand the monadic bind operator >>= is left associative (AFAIK). On the other hand the monad law demands associativity, i.e. evaluation order doesn't matter (like with monoids). Bes...
Pietje asked 7/9, 2020 at 11:56
10
Solved
What is associativity for an operator and why is it important?
Argyres asked 30/5, 2009 at 20:8
2
Solved
The Python documentation for operator precedence states:
Operators in the same box group left to right (except for
comparisons, including tests, which all have the same precedence and
chain fr...
Arithmomancy asked 9/9, 2014 at 20:59
3
Solved
It was very hard to come up with a title... (I'm not a native English speaker.)
struct A
{
int value;
A operator+(int i) const
{
A a;
a.value=value+i;
return a;
};
};
int main(){
A a;
a.v...
Goahead asked 20/4, 2013 at 9:52
2
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My question is about the following line of code, taken from "The C Programming Language" 2nd Edition:
*p++->str;
The book says that this line of code increments p after accessing whatever str...
Vernal asked 30/6, 2019 at 15:39
1
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I'm writing my own programming language, and I have the tokenizer (lexer) all done. But for parsing, I'm having trouble writing a recursive descent parser. It seems to be right associative, when it...
Chuu asked 13/6, 2018 at 21:42
3
Solved
Ruby:
true == true == true
syntax error, unexpected tEQ
vs. JavaScript:
true == true == true
// => true
vs. C:
1 == 1 == 1
// => 1
Quaquaversal asked 9/1, 2018 at 0:2
5
Solved
In the PHP manual, I find the following 'user contributed note' under "Operators".
Note that in php the ternary operator ?: has a left associativity unlike in C and C++ where it has right ...
Triturable asked 13/12, 2013 at 4:33
1
Solved
Clickbaity title but it's too meaty to pass up. I have this operator which I want to be right associative:
sub infix:<↑> ( Int:D \n, Int:D \m --> Int:D )
is assoc<right>
is equiv(...
Emplacement asked 12/1, 2018 at 4:56
1
Solved
fmap is also <$> because it is function application ($) in the functor category.
(+5) $ (*10) $ 10 -- 105
(+5) <$> (*10) <$> [1,2,3] -- [15,25,35]
Then I thought, well in that ...
Galumph asked 31/12, 2017 at 14:13
0
I'm trying to prove that type-level function Union is associative, but I'm not sure how it should be done. I proved right identity and associativity laws for type-level append function and right id...
Unilateral asked 25/11, 2017 at 11:47
1
Solved
I just noticed that (<$>) has a fixity of infixl 4. How can this be?
(+1) <$> (/5) <$> [5,10] obviously works right to left.
Ranie asked 15/4, 2017 at 14:41
2
Solved
I have the following EBNF grammar for simple arithmetic expressions with left-associative operators:
expression:
term {+ term}
term:
factor {* factor}
factor:
number
( expression )
How can...
Aarau asked 11/7, 2012 at 12:50
4
Solved
The C++ operator precedence table from http://en.cppreference.com/w/cpp/language/operator_precedence (I know it's not normative, but the standard doesn't talk about precedence or associativity) mar...
Nude asked 18/10, 2012 at 18:30
6
Solved
When does operator << refer to the insertion operator and when does it refer to the bitwise left shift?
This will output 10, and operator << refers to the left shift.
cout << a...
Nada asked 10/8, 2016 at 10:17
1
Solved
I am having trouble understanding the concept of associativity in the context of ternary operators. In most cases, ternary operators look like this:
a ? b : c
In this case, no associativity is n...
Fond asked 30/3, 2016 at 21:6
2
Solved
N4191 proposed fold-expressions to C++. The definition there was that
(args + ...)
is a left-fold (i.e. (((a0 + a1) + a2) + ...), and that
(... + args)
is a right-fold (i.e. (... + (a8 + (a...
Million asked 2/2, 2016 at 20:28
3
Solved
I understand that the assignment operator is right associative.
So for example x = y = z = 2 is equivalent to (x = (y = (z = 2)))
That being the case, I tried the following:
foo.x = foo = {a:1}
...
Approbation asked 1/12, 2015 at 16:53
3
Solved
I'm new to R, and I just discovered I suffer from Bracket Phobia (see comment in the link). I like the way magrittr notation %>% works, because it avoids nested parenthesis in some situations, a...
Fraught asked 8/7, 2015 at 23:4
3
Solved
I was going through the topic of associativity of C operators.
There I came across this fact that the function call operator () has a left to right associativity. But associativity only comes to p...
Haemolysis asked 10/8, 2015 at 11:1
2
Solved
According to this table, ++ has right to left associativity. So, I run this code:
int a = 5;
++a + ++a * ++a
and expect the expression to be 50 (as 8 + 7 * 6, increment starts from right to left...
Express asked 18/6, 2015 at 9:21
2
Solved
I'm just learning Haskell and I'm still not entirely clear on when and how strict evaluation is forced
When I want a function to evaluate its arguments strictly I find myself writing
((f $! x) $!...
Swill asked 9/5, 2014 at 17:18
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