Questions tagged [integer]

Use this tag for questions about using, storing or manipulating integral values of all types and sizes, including concerns about overflow. Not for code that casually happens to use integers.

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3answers
104 views

Convert string to integer and catch errors

I have attempted [and made one] function to convert string to integer and catch errors in pure c Working method The whole working method is present in code itself The header file The str2num.h here:- <...
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0answers
44 views

Displaying Submitted Links Securely On Your Pages

I wanted to allow my website visitors (any Tom, Dick & Harry) submit their links to my webpage for output on my page. I thought it's best to parse user submitted urls before echoing their ...
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1answer
75 views

A simple Java integer integer hash set - follow-up 2

(See the previous version.) Now I have this: com.github.coderodde.util.IntHashSet: ...
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0answers
58 views

A simple Java integer hash set - follow-up

(See the previous version.) (See the next version.) After incorporating changes in the previous post, I came up with this implementation. However, I left hashing as it is. ...
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4answers
1k views

A simple Java integer hash set

(See the next version.) The following data structure implements a hash table based set for int values: ...
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3answers
60 views

Validating an integer with affixes in compile-time or runtime

I'm implementing a function called is_proper_integer that will check the string whether it is a valid integer literal by borrowing the idea from C++ grammar. ...
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2answers
87 views

Unsigned 64bit subtract-with-borrow in Standard C++

I'm writing a (compile-time-)fixed-width unsigned big integer. To implement subtraction, a subtract-with-borrow primitive is required. When efficient platform-specific implementation isn't available (...
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3answers
98 views

Luhn algorithm using Stream API

Example ...
2
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1answer
79 views

Safe runtime numeric casts

The rationale behind this code is to implement a runtime-safe number conversions in situations when precision loss is possible, but is not expected. Example: passing a ...
2
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1answer
205 views

Write a Kotlin-function isPrimeNumber

Exercise: Write a prime number-test isPrime(num: Int), which for integer m >= 2 checks, if the integer is a prime number or not. My solution: ...
0
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1answer
37 views

optimize integer validation

I have some classes with properties, wich could only have numeric values in a given range (e.g. 0 to 8). This should be validated and wrong values prevented with an exception. The given behavior may ...
6
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3answers
181 views

Fastest (in clock cycles) 16-bit x 16-bit unsigned integer division algorithm for ATMEGA1284?

I am trying to create an optimized 16-bit division algorithm for the AVR ATMEGA1284. The goal is to reduce the number of clock cycles as much as possible. AVR INSTRUCTION SET MANUAL: https://ww1....
2
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1answer
270 views

C++: swapping bytes of an uint64_t

This question is about swapping bytes of an uint64_t value, or in other words, about converting between endianness of an integer value: ...
4
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1answer
220 views

Integer version of c++ standard library midpoint

I was extremely annoyed by the lengthy, edge-case-galore explanation of integer version of C++ standard library mindpoint implementation here, so I made my own simple 2's complement version. I present ...
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2answers
1k views

Football management game in C++

Recently, I have been working on a College Football Manager game, in which you coach a team from the ground up. I have successfully made it to where you can win games, lose games, and change your team ...
3
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2answers
191 views

How to simplify and optimize bitwise get/set operations on a large bit buffer in JavaScript?

tl;dr: How could you rewrite the buf_get and buf_set functions below to be most optimal? It took me a long time and a lot of ...
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1answer
97 views

Converting an integer to a hexadecimal string representation in Java

I have rolled my own Java method for converting ints to the hexadecimal Strings: ...
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2answers
1k views

Swapping bytes of an integer in Java

I have this tiny function that expects an int and returns an int with the bytes swapped: ...
5
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2answers
473 views

How to optimize bitwise get/set/clear of ranges of bits on 8-bit integers in JavaScript?

I have been working for a few days on writing get, set, and clear bitwise functions in ...
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1answer
264 views

Return reversed integer - Java [closed]

The question is from Leetcode. Given a 32-bit signed integer, reverse digits of an integer. ...
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1answer
92 views

Implementation of itoa

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5answers
1k views

Convert Integer to String without using Java API library

I have written a Java program that converts an integer to String digit by digit and concatenate them together using the + operator without touching the Stock Java API library. I like to have feedback ...
4
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1answer
42 views

Large number stored as vector, increase performance

I made a code to initialize char vectors with random numbers representing very large numbers with more than 20.000 digits. The additions and multiplications are correct but my code is too slow (1 ...
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2answers
188 views

Reading and Storing Integer from Serial Monitor

Description I wanted to understand how integers can be written and stored inside variables without the use of Serial.parseInt(). I couldn't find any code examples about this. Perhaps this is the ...
5
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1answer
205 views

HugeInt division using base 2^32 implementation

I previously submitted my code for a HugeInt class here. That version lacked a long division implementation. I have now implemented (long) division using Donald Knuth's algorithm D, following the ...
3
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1answer
510 views

Plotting the integer values in text format in matplotlib piechart

I have done a clustering algorithm and represented the results in a pie chart as shown below. ...
12
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3answers
1k views

Huge integer class using base 2^32 (was 256) follow up

Thanks again to everyone for their very useful suggestions concerning a huge integer class I posted here several days ago. I have made many of the suggested changes, perhaps the biggest being in the ...
21
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2answers
3k views

Huge integer class using base 256

After a hiatus, I have returned to coding in C++. In an effort to learn some of the newer aspects of the language and for exercise and 'up-skilling', I am writing some simple classes and this ...
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1answer
51 views

"Reflecting" addition

I'm implementing the following function for signed integer numbers: given endpoints of a closed interval lo and hi, and inputs <...
6
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3answers
222 views

Safe Integer Library in C++

I've designed a single-file safe integer library in C++. It catches undefined behavior prior to integer overflows or underflows and throws the respective exceptions. I intend this to be portable, to ...
4
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2answers
178 views

converting bits binary to bcd

I wrote a code that requests user input and then converts binary to bcd then back to binary using bitwise operations. While I think my code is good I want to know if there is a better way to write the ...
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2answers
477 views

C - manually parsing char* into integer

I'm trying to parse a char* into an int without using atoi(). I walk through the string, ...
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1answer
1k views

Codewars: Sum Strings

Sum Strings Codewars kata. It's supposed to be able to handle big integers.   Question Given the string representations of two integers, return the string representation of the sum of those integers. ...
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1answer
449 views

Computational verification of Collatz conjecture using OpenCL

This code review request follows my previous request Computational verification of Collatz conjecture. Unlike the previous program (which was designed for the CPU), this code should run on modern GPUs....
4
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1answer
91 views

Manually formatting numbers in Python

I was working on a little Python challenge that was a bit more difficult than expected: format any non-negative number so 1000 turns into ...
9
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2answers
534 views

Converting integers into Unary Notation

I have written a python script that has tallies representing digits 1-9 (0 is just ":" ) Unlike true Unary languages that are in the form 1^k. I represent values for n as per their decimal digits. The ...
0
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2answers
89 views

Python code to continue if a certain type is seen, otherwise try again to get valid input [closed]

I am very very new to programming, and this is my first day using Python. I want to check to see if an input is of type 'int' and to proceed with my program if the user has entered an 'int', ...
3
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2answers
96 views

Computational verification of Collatz conjecture using gmplib

Prerequisites The unsigned long type has a size of 64 bits. The following macros are defined. ...
3
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1answer
336 views

Computational verification of Collatz conjecture

Prerequisites The typedef name uint128_t designates an unsigned integer type with width exactly 128 bits. The ...
2
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1answer
61 views

Invert bits of a number in clojurescript

Doing a challenge to print the number that you would get if you convert a given number to binary, invert its bits, then convert back to decimal. I decided to give it a run in clojurescript (which I ...
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1answer
4k views

Find the product of digits at odd/even places

The 'score' of a race is given. We have to calculate the 'bonus points' to be given to the participant. The '...
2
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1answer
555 views

Using BigInt in JavaScript, write a factorial function that takes either a Number or BigInt and returns a BigInt

Is there anything missing or any pitfall when using BigInt? ...
4
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1answer
90 views

Binary Trie in F#

I have this little exercise writing a binary trie in F#. In C# it can be done in few lines, but here it became more complicated than I had expected (especially the ...
3
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1answer
386 views

Python maintain precision for currency

Working with currencies I am aware it is not good to work with floating point values due to rounding and maintaining precision. Better is to work with integers. Would the following Currency class make ...
2
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2answers
1k views

Iterating over a range of integer ranges in Java

My use case is this: RangeDemo.java: ...
3
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4answers
548 views

Test if a number is within 2 of a multiple of 10

I have solved this exercise, but it looks really redundant. Is there a built-in function in Java or a cleaner way to caluclate mod of a value + deviation without multiple OR statements? If I had to ...
2
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1answer
330 views

Indeterminate-length big-endian to little-endian conversion in Python

I have a need to convert wire encoding (big-endian) to little-endian in Python. The conversion needs to happen as a separate function; I am not allowed to change the function that reads the byte ...
5
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2answers
132 views

Templated division by a power of 2

I've implemented a div_by_power_of_2() function, which lets me force the compiler to use left-shifting rather than proper division, in cases when the developer know ...
14
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1answer
3k views

128-bit unsigned integer

This implements 128-bit unsigned integer using C++14. It works on MSVC and 32-bit architectures being complementary to the unsigned __int128 type provided by GCC ...
4
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1answer
321 views

Converting long values in Java to unsigned strings

This one is a research attempt to find out how to convert long values as unsigned long integers to Strings. It is much slower ...

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