An arithmetic expression is an expression that results in a numeric value. There are two kinds of numeric values, integers (whole numbers), and real or floating point numbers (numbers containing a decimal point).
Questions tagged [arithmetic-expressions]
677 questions
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votes
9 answers
General-purpose language to specify value constraints
I am looking for a general-purpose way of defining textual expressions which allow a value to be validated.
For example, I have a value which should only be set to 1, 2, 3, 10, 11, or 12.
Its constraint might be defined as: (value >= 1 && value <=…
g t
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votes
2 answers
Arithmetic C++ Operators
I was just asked a question in a technical interview that I was a bit confused about.
The question was as follows:
If
int i = -1, int j = -1, and int k = -1,
and we run the following line:
++i && ++j && ++k
what would be the new values of i, j,…
John Roberts
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9
votes
2 answers
Is there such a thing as short circuit multiplication?
We all know about short circuiting in logical expressions, i.e. when
if ( False AND myFunc(a) ) then
...
doesn't bother executing myFunc() because there's no way the if condition can be true.
I was curious as to whether there is an equivalent for…
Verge
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9
votes
1 answer
Python Decimal - multiplication by zero
Why does the following code:
from decimal import Decimal
result = Decimal('0') * Decimal('0.8881783462119193534061639577')
print(result)
return 0E-28 ?
I've traced it to the following code in the module:
if not self or not other:
ans =…
tonysepia
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votes
1 answer
int divided by unsigned int causing rollover
I try to divide int by unsigned int and I get unexpected result:
int b;
unsigned int c;
int res;
float res_f;
b = -25;
c = 5;
res = b / c; // res = 858993454
res_f = b / c; // res_f = -5.000000
The same works just fine for '+', '-' and '*', but…
shushu
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votes
4 answers
Java precedence for multiple + and - operators
This is more of a theoretical question to understand Java's evaluation of arithmetic operations. Since + and - have the same precedence, I don't quite understand how Java evaluates the following expressions (where there are more than one + and -…
ncw
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9
votes
3 answers
bc arithmetic Error
i am trying to solve this bash script which reads an arithmetic expression from user and echoes it to the output screen with round up of 3 decimal places in the end.
sample input
5+50*3/20 + (19*2)/7
sample output
17.929
my code is
read x
echo…
krrish
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9
votes
2 answers
How to be warned about potential arithmetic errors due to type conversion?
I am working on a calculation module using C#, and I bumped on this :
double v = 4 / 100;
I know this is a wrong initialization that returns v = 0.0 instead of v = 0.04
The c# rules says I must ensure at least one of the member is a double, like…
Larry
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Storing basic arithmetic operators in variables
How can I store a basic arithmetic operator in a variable?
I'd like to do something like this in c++:
int a = 1;
int b = 2;
operator op = +;
int c = a op b;
if (c == 3) // do something
Since I'm considering only +, -, * and / I could store the…
MrDatabase
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8
votes
3 answers
convert scientific notation to decimal in bash
I would like to convert a number that is stored in scientific notation into a floating point decimal, so I can then perform some comparisons on the data. This is being done in a bash script - here is a small snippet of the code:
while read track_id…
kimmyjo221
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How does the formula x & (x - 1) works?
From Hacker's Delight: 2nd Edition:
The formula here seems a little bit awkward here. How is some x vector is subtracted from 1 vector (presumbly 0x1111 1111) when x is smaller than 1? (Like: (as given in example) 0x0101 1000 - 0x0000 0000 doesn't…
RewCie
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4 answers
What precision are floating-point arithmetic operations done in?
Consider two very simple multiplications below:
double result1;
long double result2;
float var1=3.1;
float var2=6.789;
double var3=87.45;
double var4=234.987;
result1=var1*var2;
result2=var3*var4;
Are multiplications by default done in a higher…
Pooria
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votes
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C style arithmetic with floating point values in Bash
How can I have the right result from this bash script?
#!/bin/bash
echo $(( 1/2 ))
I get 0 as result! So I tried to use these but without success:
$ echo $(( 1/2.0 ))
bash: 1/2.0 : syntax error: invalid arithmetic operator (error token is ".0 ")
$…
Alberto
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votes
1 answer
Minimize parenthesis when printing expression
I have a simple arithmetic expression data structure that I want to be able to print. For sake of simplicity here I have made an example with 3 binary operations, addition, multiplication and division. The definition looks like this:
module…
CryptoNoob
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votes
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Why is my code not calculating the correct value for the expression string?
In the code I use an expression tree "3 + 2.53 - 1.75" that should return a result of 3.78. However, it ends up adding all the values within the string and outputs 7.28. I ran through the code multiple times on paper trying to see what happens in…
Code4life
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