The [tag:arithmetic] tag is applied to questions that ask for answers heavily involving the use of advanced mathematics.
14
votes
15answers
1k views
Length of String Using Set Theory
From Wikipedia Set-theoretic definition of natural numbers
The set N of natural numbers is defined as the smallest set containing
0 and closed under the successor function S defined by S(n) = n ...
1
vote
0answers
90 views
Give all the ways to reach 100 [duplicate]
Write a program that finds all the ways you can write 100 as
123456789 separated only by the characters +-*/ and space. Example:
123 + 4 - 5 + 67 - 89 = 100. You can output your answers in any format ...
6
votes
10answers
300 views
how to find n'th number in the decimal expansion of a proper fraction?
Given three integers N,D,R write a program to output Rth digit after the decimal point in the decimal expansion for a given proper fraction N/D.
4
votes
2answers
423 views
math with bitwise operators
objective
write a program that can perform addition, subtraction, multiplication, and division, using only bit-wise operators, by bit-wise operators i mean the equivalent of JavaScript &, |, ^, ...
0
votes
3answers
706 views
javascript: smallest code to convert seconds to time [closed]
Given seconds like 11728, write the smallest javascript function that returns a string like 3hrs. 15min. 28sec.
signature textTime([int] t,[bool] z,[bool] m)
t is the time like 11728 and you can ...
8
votes
4answers
660 views
No branching please
Anyone who is moderately into low level code optimization know about the perils of branching, be it implemented as if-statements, loops or select-statements the possibility of a branch misprediction ...
1
vote
1answer
455 views
Basic Calculator with GUI
I recently had to add a small basic calculator to a project. I wrote a quick dirty one, but it seemed small enough to check with you people out here ;)
Just out of curiosity & an appetite to get ...
6
votes
3answers
323 views
Simultaneous equations
With equations that have more than one unknown, simultaneous equations can be used in solving for them. This challenge will only deal with linear equations with two unknowns, to make things as ...
5
votes
5answers
788 views
Build a solver for the cow and chicken problem
The cow and chicken problem is a traditional problem for introducing young students to the concept of systems of equations. It goes as follows:
A farmer raises cows and chickens on his farm. His ...
15
votes
3answers
840 views
Four fours puzzle
The Four fours puzzle is a popular recreational mathematical puzzle that involves using exactly four 4s (and no other number) and a defined set of operations to reach every number from 0 to a given ...
7
votes
4answers
323 views
Fourth of July Edition: Print lines of a file containing multiples of a specific number
Create a program which takes one command-line argument, n, which will be an integer less than 2147483648 (2^31), and then reads a file input.txt and prints the lines of input.txt which contain any ...
1
vote
2answers
275 views
Floating points: Make Gaussian elimination go wrong
You know that some decimal numbers can't be expressed as IEEE 754 floating points. You also know that arithmetic with floating points can give results that seem to be wrong:
...
3
votes
9answers
416 views
Evaluate the primorial of a number
The primorial of a number is the product of all the primes till that number, itself included.
Input a number from STDIN and evaluate its primorial.
Don't use libraries. Shortest code wins.
4
votes
7answers
491 views
Evaluate the nth hyperoperation
I do realise that this is a bit math-y, but - here goes.
In mathematics, the hyperoperation sequence is an infinite sequence of
arithmetic operations (called hyperoperations) that starts with the
...
3
votes
9answers
573 views
Generate math problems
Generate math problems (addition, subtraction, or multiplication) using numbers 0-10. Provide feedback on whether the user was right or wrong and show a score.
Specifics:
Must generate addition, ...
9
votes
5answers
423 views
Visualise long multiplication with ASCII art
The challenge
Write a program that takes two integers from standard input, separated by a comma, and then prints a visualisation of long multiplication of those two integers to standard output.
Eg:
...
5
votes
3answers
621 views
Implementing Binary Arithmetic
Given two binary numbers (strings containing 0s and 1s), perform operations on them, with one problem: You must keep them in binary. That means no going binary(integer(n1)+integer(n2)) or anything ...
-5
votes
1answer
279 views
Sort an array with values of integer
There is an array of integer values to be sorted.During the sorting process, the places of two numbers can be interchanged. Each interchange has a cost, which is the sum of the two numbers involved.
...
1
vote
1answer
755 views
Getting an answer from a string of digits.
Write a program which will find all solutions to make the string "123456789" evaluate to a integer input value by inserting any of the four basic arithmetic operations (+ - * /) into the string in any ...
7
votes
17answers
1k views
Additive Persistence
The shortest code to pass all possibilities wins.
In mathematics, the persistence of a number measures how many times a certain operation must be applied to its digits until some certain fixed ...
12
votes
4answers
944 views
Visualize long division with ASCII art
Write a program that visualizes long division with ASCII art. Input consists of two integers, a numerator and a denominator, using the input format of your choice.
Examples:
1234 ÷ 56:
...
5
votes
4answers
363 views
Obtain a number from 4 numbers using any combination of mathematical operations
Given 4 numbers n1, n2, n3, n4, and a goal n5, obtain n5 using n1 through n4 combined with any operations.
Eg. Given four numbers 2,3,4,5 and the goal as 8, output (one of many) is 2-3+4+5
EDIT: ...
7
votes
16answers
1k views
Basic Calculator
You must write a program to evaluate a string that would be entered into a calculator.
The program must accept input and output the correct answer. For languages that do not have standard ...
13
votes
30answers
2k views
Implement division
Implement a division algorithm in your favourite language which handles integer division. It need only handle positive numbers - but bonus points if it handles negative and mixed-sign division, too. ...
