comparison-operators Questions
1
Solved
Overloading the operator bool() for a custom class T breaks std::vector<T> comparison operators.
The following code tried on the first online compiler google suggest me prints
v1 > v2: 0
v...
Avid asked 18/4 at 10:38
3
Solved
How I can filter SQL results with != in PostgreSQL SQL query? Example
SELECT * FROM "A" WHERE "B" != 'C'
Working. But it's also filtered all record where "B" IS NULL....
Fibroblast asked 8/4, 2016 at 20:31
7
Solved
Precondition: Consider such a class or struct T, that for two objects a and b of type T
memcmp(&a, &b, sizeof(T)) == 0
yields the same result as
a.member1 == b.member1 && a.memb...
Ascender asked 4/3, 2015 at 15:31
4
Solved
I am wondering how the PHP spaceship operator compares strings, objects and arrays. For example, the below code.
echo "Its Me at SO" <=> "Its Me at SO";
will return 0, a...
Panay asked 15/1, 2016 at 12:56
1
Solved
After switching to C++20 I found that some of our tests failed.
The output of the following code is different between C++17 and C++20 modes:
https://godbolt.org/z/hx4a98T13
class MyString
{
public:...
Coligny asked 8/9, 2023 at 15:1
5
Solved
C++ primer, 5th, 14.8.2, Using a Library Function Object with the Algorithms:
vector<string *> nameTable; // vector of pointers
// error: the pointers in nameTable are unrelated, so < is u...
Forearm asked 13/3, 2017 at 11:33
21
Solved
Does Python have something like an empty string variable where you can do:
if myString == string.empty:
Regardless, what's the most elegant way to check for empty string values? I find hard coding...
Verwoerd asked 5/3, 2012 at 20:9
8
Solved
I'm trying to compare two numbers in R as a part of a if-statement condition:
(a-b) >= 0.5
In this particular instance, a = 0.58 and b = 0.08... and yet (a-b) >= 0.5 is false. I'm aware of ...
Sophiesophism asked 4/5, 2010 at 22:55
2
Solved
After upgrading to latest Visual Studio 2022 version 17.6, one of our custom views stopped to be recognized as std::ranges::range. It turned out that the problem was in the presence of both operato...
Estabrook asked 19/5, 2023 at 13:5
10
Solved
How would you say "does not equal"?
if hi == hi:
print "hi"
elif hi (does not equal) bye:
print "no hi"
Is there something similar to == that means "not equal&...
Jellicoe asked 16/6, 2012 at 3:19
2
Solved
The result of this comparison surprised me (CPython 3.4):
>>> 9007199254740993 == 9007199254740993.0
False
My understanding of the the docs is that the left operand should be cast to fl...
Hitherward asked 15/7, 2015 at 17:44
2
Solved
I am learning and playing around with Python and I came up with the following test code (please be aware that I would not write productive code like that, but when learning new languages I like to ...
Handyman asked 9/12, 2022 at 12:34
9
Solved
I cannot get the command cmp() to work in Python 3.
Here is the code:
a = [1,2,3]
b = [1,2,3]
c = cmp(a,b)
print (c)
I am getting the error:
Traceback (most recent call last):
File "G:\Dropb...
Abdullah asked 18/3, 2014 at 20:30
3
Solved
I'm trying to test if a number is greater than 0 but less than 8. How do I do that in JavaScript?
This is what I'm trying:
if (score > 0 < 8) { alert(score); }
Simson asked 23/11, 2011 at 3:6
5
Solved
Is there a way to check if two expressions are mathematically equal? I expected
tg(x)cos(x) == sin(x) to output True, but it outputs False. Is there a way to make such comparisons with sympy? Anoth...
Ozzy asked 9/5, 2016 at 9:56
4
I have a block of code in a function that does some comparisons, namely:
if customer_info['total_dls'] < min_training_actions \
or customer_info['percentage'] > train_perc_cutoff:
con...
Shockheaded asked 28/4, 2014 at 18:59
2
Solved
Below is one of conditional statements from the source code of d3.min.
What is this checking for?:
value >= value
Here is the entire source code:
export default function min(values, valueof) {
...
Melancholic asked 12/4, 2022 at 9:0
3
Ruby has something called a Combined Comparison or "Spaceship" Operator, it looks like this: <=>
It does the following:
a <=> b :=
if a < b then return -1
if a = b then return 0
...
Premonition asked 18/1, 2016 at 10:49
4
I hoping someone can help with this.
I have created a class with a function in it that counts the total cars in 4 lists of cars.
On another script I am creating the interface and want to say if t...
Emilieemiline asked 20/10, 2018 at 13:2
3
Solved
public class List<T>
{
public int Count
{
get;
}
}
I noticed Count is an int, will the result be less than 0？
If Count could be less than 0, I have to write that：
if(myList.Count < 1)...
Inexperienced asked 25/9, 2021 at 0:13
1
Solved
Does virtual `operator <=>` with default implementation make one more virtual method in C++20?
If one makes virtual C++20 three-way comparison operator <=> with the default implementation, then the compiler silently makes one more virtual operator==, as can be shown by overriding it in...
Aileenailene asked 6/9, 2021 at 6:41
1
Solved
Starting from C++20, the compiler can automatically generate comparison operators for user classes by means of operator ==() = default syntax. But must this operator be defaulted only inside the cl...
Hildick asked 5/9, 2021 at 12:51
4
Solved
Comparing boolean values with == works in Python. But when I apply the boolean not operator, the result is a syntax error:
Python 2.7 (r27:82500, Sep 16 2010, 18:02:00)
[GCC 4.5.1 20100907 (Red H...
Teacart asked 23/5, 2011 at 16:45
4
I have a JavaScript if condition containing some comparison operators (<=, >=) inside a partial view. This JavaScript is surrounded by MVC the Razor <text> tags.
With this, my JS is dyn...
Dina asked 12/11, 2018 at 22:24
11
Solved
I was wondering if there is any way to detect if a number is negative in PHP?
I have the following code:
$profitloss = $result->date_sold_price - $result->date_bought_price;
I need to fin...
Ironwood asked 26/5, 2011 at 7:44
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