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I am trying to code something in Haskell and can't find a breakthrough. What I'm trying to do, is from GHCi input one pair of numbers, do some equations with them and print out results. Let say the input is (a,b). Equations could be as simple as c = b **2 + a **3 - sin b and d = a - b
The output should be (c,d). Is it possible to do it and how.
Here is a sample ghci session:
> a = 3
> b = 4
> (b**2 + a**3 - sin b, a - b)
(43.75680249530793,-1)
If this does not meet your needs, you will need to be more specific about your needs (preferably in a fresh question that refers to this one and explains why the new question is different from this one).
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a = 5
b = 3
How to substitution without creating a new variable in python and JS Or other programming language.
The value of (a) should be replaced by (b), and the value of (b) by (a).
Tried but couldn't without creating a new variable.
you can use :
a , b = b , a
hope it was usefull theres other methos but this is the easiest
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I'm currently looking for how to get all possible solutions for an expression in Rust
// example expression
x * y = 8
// more complex expression
4x^2 + y^2 = 961
and now the results should be for the first expression:
[(1,8), (2,4), (4,2), (8,1)]
Is something like this possible without going through every number in a for loop?
// this would be a way (but i guess its a bad way)
for i in 1..8 {
if 8 % i == 0 {
// add this i option to the vector and get the division factor
let division_factor 8 / i
possible_solutions.push((i, division_factor));
}
}
And this is surely not the best practice, and I'm looking for a way with a good performance.
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N people sit around a circular table. You have to find the probability that two particular people won't be sitting together.
The input will have the number N and the output should have the probability printed as a float type number rounded off to four decimal places.
Here's the link for the derived formula
You can find the step by step derivation over there
Here's the simple python implementation as per the thread
n = 5
result = (n-3)/(n-1)
print(result)
n= int(input())
import math
print(round(1-math.factorial(n-2)*math.factorial(2)/math.factorial(n-1),4))
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How to take operator as input and how to perform operations using tat operator
I have tried using functions
If we provide the input 2,5,+. the program should give output as 7.
I'm not going to give you all of the code, but here's a good starting point.
In Python, check out the operator module:
>>> import operator
>>> sum = operator.add(2, 5)
>>> sum
7
>>> diff = operator.sub(2, 5)
>>> diff
-3
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In GHC (without language extensions) I have to do this:
x = 2 Prelude.+ 1
-- valid: x = (Prelude.+) 2 1
-- invalid: x = Prelude.+ 2 1
-- also invalid: x = 2 `Prelude.+` 1
How to change this behavior?
Quoting the Haskell Report, section 2.4:
The qualifier does not change the syntactic treatment of a name; for example, Prelude.+ is an infix operator with the same fixity as the definition of + in the Prelude
So, assuming the Prelude qualifier is just an example and you want to use the syntax shown in the comments, I don't think there is a way.