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.
Questions tagged [negative-number]
599 questions
5
votes
3 answers
The mod of negative numbers in C
In C the following code ...
#include
#include
#include
#include
int main() {
int result = (-12) % (10);
printf("-12 mod 10 = %d\n",result);
return 0;
}
gives this output
> gcc modTest.c
>…
SA610
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5
votes
1 answer
How to block negative numbers on h:inputText with JSF
I´m using jsf to build a form, and I have this kind of inputtext:
5
votes
3 answers
Prevent user passing negative numbers to a function accepting unsigned int
So here's the code:
int create_mask(unsigned b, unsigned e)
{
unsigned int mask=1;
if(b= 0.\n");
…
zubergu
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5
votes
4 answers
Regex pattern to match positive and negative number values in a String
I have pattern/matcher lines that transform input Strings like this:
1 3 Hi [2 1 4]
into an Array like this:
[0] => "1"
[1] => "3"
[2] => "Hi"
[3] => "2 1 4"
That's the code:
String input = sc.nextLine();
Pattern p =…
afontcu
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4
votes
2 answers
Delphi - from Integer to Byte type (negative number conversion)
I tested some code:
var
B: Byte;
I: Integer;
begin
I := -10;
B := I;
end;
And I expected to see the result in the variable In the number 10 (since this is the low byte of the type integer ). But the result was B => 246.
Logically, I…
DevSergo
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- 6
4
votes
1 answer
sprintf adds minus sign to zero after rounding
Let's do some rounding
> round(-0.001, 2)
[1] 0
I receive zero.
Now in combination with sprintf
> sprintf("%f", round(-0.001,2))
[1] "-0.000000"
Why is there a minus sign? I expected 0.000000.
$R --version
R version 2.13.1 (2011-07-08)
woobert
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4
votes
2 answers
When is it useful to write "0 - x" rather than "-x"?
I've occasionally noticed some C code insisting on using 0 - x to get the additive complement of x, rather than writing -x. Now, I suppose these are not equivalent for types smaller in size than int (edit: Nope, apparently equivalent even then), but…
einpoklum
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4
votes
2 answers
How to use order function to order negative value?
I am trying to use order function to order a column of the table,
a<-c("-2","-7","-4")
b<-c("9","-1","3")
z<-data.frame(a,b)
When I want to order Z by column a, from the largest to smallest, while it doesn't work. The function orders the…
Eva
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4
votes
5 answers
Converting negative number in string to float (Python)?
Ok. I give up.
I have a DataFrame with a column ("Amount") of large numbers:
Amount
-1 000 000,00
4 848 903,00
-2 949 234,00
13 038 023,00
7 985 232,00
....
I want to convert these to numbers that I can calculate with.
Let's…
Cronos
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4
votes
2 answers
How to stop Google Sheets converting numbers wrapped in parentheses to negative numbers?
I'm trying to copy a regression table into Google sheets but have encountered a problem where it converts numbers wrapped in parentheses (in this case standard errors) to negative numbers.
For example (0.02) will become -0.02. I have encountered…
Tom Davidson
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4
votes
1 answer
Extract positive and negative floating point numbers from a string in php
For a php I have to extract floating point numbers from a string. I'm new to regex, but I found a solution which works for me in most cases:
Extract floating point numbers from a string in PHP
$str = '152.15 x 12.34 x…
mischa.mole
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4
votes
3 answers
Python format negative currency
I haven't found anything that addresses how to format negative currency, so far, and it is driving me crazy.
from decimal import *
import re
import sys
import os
import locale
locale.setlocale( locale.LC_ALL, 'English_United States.1252' )
#…
Mike Sr
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4
votes
3 answers
How does imul and idiv really work 8086?
I am trying to figure out how the imul and idiv instructions of the 8086 microprocessor work.
I know this:
1. mul and div are multiplications and division for unsigned numbers
2. imul and idiv, are also multiplications and divisions but for signed…
user1812076
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4
votes
1 answer
JavaScript: greater or equal than positive zero?
Simple question: How do i test if a value is greater or equal than positive zero (+0)? Or how do I test if it's greater than negative zero (-0)?
val >= 0 or val >= +0 or val > -0 don't do the trick.
(I need it for handling moments.js diff() output.…
koubic
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4
votes
3 answers
Modulo of a negative number
Consider the following expression:
(a - b) mod N
Which of the following is equivalent to the above expression?
1) ((a mod N) + (-b mod N)) mod N
2) ((a mod N) - (b mod N)) mod N
Also, how is (-b mod N) calculated, i.e., how is the mod of a…
Born Again
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