Skip to main content
TopMiniSite

Back to all posts

How to Check If A Number Is In Octal In Haskell?

Published on
3 min read
How to Check If A Number Is In Octal In Haskell? image

Best Haskell Programming Tools to Buy in October 2025

1 Real World Haskell

Real World Haskell

  • AFFORDABLE PRICES FOR QUALITY READS WITHOUT BREAKING THE BANK.
  • ECO-FRIENDLY CHOICE: SUPPORT RECYCLING AND SUSTAINABILITY EFFORTS.
  • UNIQUE FINDS: DISCOVER RARE TITLES NOT AVAILABLE IN NEW COPIES.
BUY & SAVE
$24.40 $49.99
Save 51%
Real World Haskell
2 Learn You a Haskell for Great Good!: A Beginner's Guide

Learn You a Haskell for Great Good!: A Beginner's Guide

  • AFFORDABLE PRICES ON QUALITY USED BOOKS – SAVE MORE TODAY!
  • ECO-FRIENDLY CHOICE: RECYCLE LITERATURE AND REDUCE WASTE!
  • THOROUGHLY INSPECTED: ENJOY RELIABLE CONDITION AND GREAT VALUE!
BUY & SAVE
$35.00 $44.95
Save 22%
Learn You a Haskell for Great Good!: A Beginner's Guide
3 Effective Haskell: Solving Real-World Problems with Strongly Typed Functional Programming

Effective Haskell: Solving Real-World Problems with Strongly Typed Functional Programming

BUY & SAVE
$55.05 $57.95
Save 5%
Effective Haskell: Solving Real-World Problems with Strongly Typed Functional Programming
4 Haskell in Depth

Haskell in Depth

BUY & SAVE
$57.13 $59.99
Save 5%
Haskell in Depth
5 Learn Haskell by Example (Bookcamp)

Learn Haskell by Example (Bookcamp)

BUY & SAVE
$51.84 $59.99
Save 14%
Learn Haskell by Example (Bookcamp)
6 Programming in Haskell

Programming in Haskell

BUY & SAVE
$42.99 $47.00
Save 9%
Programming in Haskell
+
ONE MORE?

To check if a number is in octal in Haskell, you can use the following code snippet:

isOctal :: Integral a => a -> Bool isOctal n = all (`elem` ['0'..'7']) (show n)

This function takes an integral number as input and converts it to a string. Then, it checks if all the characters in the string are within the range of '0' to '7', which indicates that the number is in octal format. The function returns true if the number is octal and false otherwise.

How to format output as octal in Haskell?

You can format output as octal in Haskell using the printf function from the Text.Printf module. Here is an example of how to format a number as octal:

import Text.Printf

main :: IO () main = do let number = 123 printf "%o\n" number

This will output 173, which is the octal representation of the number 123.

How to work with negative octal numbers in Haskell?

In Haskell, negative octal numbers are represented in two's complement form, just like negative decimal numbers. To work with negative octal numbers in Haskell, you can simply use the negative sign '-' before the octal number.

For example, to represent the decimal number -10 in octal form, you can do the following:

let negativeOctal = -0o12

Here, '-0o12' represents the octal equivalent of -10. You can perform arithmetic operations, comparisons, and other operations on negative octal numbers just like any other numerical values in Haskell.

Keep in mind that when working with negative octal numbers, it's important to be aware of binary representation and two's complement form in order to properly handle negative numbers in the octal system.

How to convert octal numbers to hexadecimal in Haskell?

One way to convert octal numbers to hexadecimal in Haskell is by first converting the octal number to decimal using the readOct function from the Numeric module, and then converting the decimal number to hexadecimal using the showHex function from the Numeric module.

Here is an example Haskell function that converts an octal number to hexadecimal:

import Numeric

octalToHex :: String -> String octalToHex octalNum = showHex (fst $ head $ readOct octalNum) ""

main = do let octalNum = "17" -- Example octal number let hexNum = octalToHex octalNum putStrLn $ "Hexadecimal: " ++ hexNum

In this example, the octalToHex function takes a string representing an octal number as input, converts it to decimal using readOct, and then converts the decimal number to hexadecimal using showHex. The main function demonstrates how to use the octalToHex function with an example octal number "17".

What is the format of octal numbers in Haskell?

In Haskell, octal numbers are represented in the following format:

  • Octal numbers are prefixed with "0o" or "0O"
  • Octal digits are in the range of 0 to 7

For example, the octal number 73 is represented as 0o73 or 0O73 in Haskell.

What is the syntax for octal numbers in Haskell?

In Haskell, octal numbers are written by prefacing the number with a '0o' or '0O' prefix. For example, the octal number 17 can be written as follows:

num = 0o17