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Questions tagged [negative-number]

A negative number is a number that is less than 0. It is signified by a preceding hyphen (i.e. -12,345).

This tag should be used for any questions dealing specifically with negative numbers.

599 questions
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How to calculate modulo of negative integers in JavaScript?

I'm trying to iterate over an array of jQuery objects, by incrementing or decrementing by 1. So, for the decrementing part, I use this code: var splitted_id = currentDiv.attr('id').split('_'); var indexOfDivToGo =…
jeff
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How can I efficiently scrub Ruby's negative zero float?

In Ruby, 0.0 * -1 == -0.0. I have an application where I multiply a bunch of Float objects with -1, but I don't like the -0.0 in the output, since it's confusing. Is there a smart way of making Float#to_s output 0.0 instead of -0.0? I'm completely…
Frost
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working with negative numbers in python

I am a student in a concepts of programming class. The lab is run by a TA and today in lab he gave us a real simple little program to build. It was one where it would multiply by addition. Anyway, he had us use absolute to avoid breaking the prog…
dman762000
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How to check if a signed integer is neg or pos?

I am new to x86 assembly language, I have a signed integer saved in register eax, and I want to check if the number is negative or positive. To do that, I used bt instruction to check the first bit. Here is what I did: bt eax,0 jnc isNegative bt…
Yonk
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How does Verilog behave with negative numbers?

For instance, say I have a reg [7:0] myReg I assign it the value -8'D69 I know Verilog stores it as 2's complement so it should be stored as 10111011 The question I have now is if I were to perform an operation on it, say myReg/2 Would it evaluate…
wonton
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2's complement hex number to decimal in java

I have a hex string that represents a 2's complement number. Is there an easy way (libraries/functions) to translate the hex into a decimal without working directly with its bits?? E.G. This is the expected output given the hex on the left: "0000"…
Marsellus Wallace
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Random and negative numbers

I have to generate numbers in range [-100; +2000] in c++. How can I do this with rand if there is only positive numbers available? Are there any fast ways?
Max Frai
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Why does slice [:-0] return empty list in Python

Stumbled upon something slightly perplexing today while writing some unittests: blah = ['a', 'b', 'c'] blah[:-3] # [] blah[:-2] # ['a'] blah[:-1] # ['a', 'b'] blah[:-0] # [] Can't for the life of me figure out why blah[:-0] # [] should be the case,…
Brent Hronik
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How do I use negative numbers in a range in Swift?

I have the following code: switch self.score { case 1: self.score = self.score - 2 case -10...-10000: // ! Expected expression after unary operator println("lowest score") self.score = -10 …
webmagnets
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Java - Is there a method for Euclidean or floored modulo

Java modulo operator % is based on the truncated division (see Wikipedia: Modulo operation). 5%3 produces 2 (note that 5/3 produces 1) 5%(-3) produces 2 (note that 5/(-3) produces -1) (-5)%3 produces -2 (note that (-5)/3 produces -1) (-5)%(-3)…
boumbh
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How to iterate over range with negative step?

Is there a way to do something like: 0 to -10 map { i=> ... } repl gives me: scala.collection.immutable.IndexedSeq[Unit] = Vector()
virtualeyes
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Convert positive value to negative value in swift

I want to convert a positive value to a negative value, for example: let a: Int = 10 turn it to -10, my current idea is just use it to multiple -1 a * -1 I'm not sure if this is proper, any idea?
William Hu
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5 answers

Are there more elegant ways to prevent negative numbers in Ruby?

Given that I'd like to do the following calculation: total = subtotal - discount Because discount might be greater than subtotal, there is code like the following: class Calculator def initialize(subtotal: subtotal, discount: discount) …
Domon
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Why new[-1] generates segfault, while new[-2] throws bad_alloc?

I tried to test bad_alloc exception by passing some negative arguments to new[]. When passing small negative numbers I get what I hoped for - a bad_alloc. However, when passing -1, I can see that my object is constructed thousands of times (I print…
flyjohny
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Is there a Delphi EncodeDate/DecodeDate function version that can handle B.C. dates?

The Delphi functions EncodeDate/DecodeDate seem to be able to handle only dates after 1.1.0001. Are there some implementations of EncodeDate/DecodeDate that can handle B.C. tDateTime values?
blerontin
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