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
2
votes
1 answer
Python floating point arithemetic basics
As expected because of its finite precision, Python's floating point multiplication is not distributive over addition:
In [10]: 200 * 0.1 + 200 * 0.2
Out[10]: 60.0
In [11]: 200 * (0.1 + 0.2)
Out[11]: 60.00000000000001
And addition is not…
xnx
- 24,509
- 11
- 70
- 109
2
votes
0 answers
Unexpected output in R with modulus operator
((10*(7655.7-7652.3))%/%(2))
[1] 16
((10*(655.7-652.3))%/%(2))
[1] 17
((10*(7655.7-7652.3))%/%(2))
[1] 16
((10*(8655.7-8652.3))%/%(2))
[1] 17
((10*(9655.7-9652.3))%/%(2))
[1] 17
((10*(7655.7-7652.3))%/%(2))
[1] 16
%/% operator gives the…
Mayank Raj
- 121
- 2
- 12
2
votes
1 answer
Javascript: /e modifier for RegExp in Javascript
Is there something like Perls /e modifier in JavaScript to integrate simple arithmetic like multiplication and addition to a regular expression that is evaluated with the RegExp object?
I want to transfer a pattern for URL generation which may…
Sebastian Barth
- 4,079
- 7
- 40
- 59
2
votes
2 answers
How does the integer overflow work in C?
I am a bit confused about how is arithmetic calculations are handled in a fixed point environment.
Consider following lines of code:
/* unsigned short is 16 bit.*/
unsigned short x = 1000;
unsigned short res;
/* Case1: The following yields correct…
sdevikar
- 437
- 6
- 20
2
votes
1 answer
Syntax error: invalid arithmetic operator (error token is ".")
I have to search word occurrences in a plain text file using a script. The script that I wrote is:
#!/bin/bash
if [ $# -ne 1 ]
then
echo "inserire il file che si vuole analizzare: "
read
fileIn=$REPLY
else
…
shogitai
- 1,823
- 1
- 23
- 50
2
votes
1 answer
DRY arithmetic expression evaluation in Prolog
I wanted to write evaluating predicate in Prolog for arithmetics and I found this:
eval(A+B,CV):-eval(A,AV),eval(B,BV),CV is AV+BV.
eval(A-B,CV):-eval(A,AV),eval(B,BV),CV is AV-BV.
eval(A*B,CV):-eval(A,AV),eval(B,BV),CV is…
Legat
- 1,379
- 3
- 11
- 20
2
votes
4 answers
Convert an alphabetic string into digits and recursively sum them so they're below a certain max
Here's an arithmetical puzzler for you StackOverflowers. I'm working on a JS game that'll allow someone to enter their name and will generate another name based on what they enter. Sort of like this. Basically every time someone enters a particular…
And Finally
- 5,602
- 14
- 70
- 110
2
votes
3 answers
Java very small number arithmetic operation
The result of expression: 2.227E-19-1.0+1.0 would be 0.0
How can I get result of 2.227E-19 ?
I have an expression
a-b+1
and
a always be a very small number.
b might be close to 1.0
HOW to keep accuracy when a very small number operate with a…
x y
- 21
- 2
2
votes
2 answers
Is there an easy way to get the POSIX shell to interpret numbers with leading zeroes as decimal?
In a POSIX shell script, I'd like to use decimal numbers generated by seq -w both in string manipulations and in simple calculations using $(( ... )). This breaks because numbers with leading zeroes are interpreted as octal numbers. I have come up…
hillu
- 9,423
- 4
- 26
- 30
2
votes
2 answers
Solving simple string expressions (1+2*3) in Java [Almost Done]
I'm trying to solve simple string expressions e.g. 1+2*3/4, without brackets. I'm done with simple integer part, the above expression will work perfectly, but now i'm stuck with decimal values, for example 1.1/2.2*4.4 All i want is to push the whole…
Abdul Jabbar
- 2,573
- 5
- 23
- 43
2
votes
1 answer
Bash - arithmetic in array index
Say I have an array arr and an index x. How do I assign something to the array at index x+1? I'm getting bugs by trying the following, if one of them is correct I'd love to know which one and if not what am I doing wrong?
arr[$x+1]="hi" #…
Dori
- 1,035
- 1
- 12
- 22
2
votes
2 answers
Dot product Prolog/3 need Hint for the SUM
Good Day I am doing the problema of arithmetic in prolog and Yes its the dot Product I have Searched and found a mess of code that did not equal to what the book is asking me. Its a /3 so this is what i have so far but i need to sum the result of…
HTLINK
- 65
- 1
- 7
2
votes
4 answers
Number Base in Bash
To force numbers to be interpreted in base10, you can prefix with 10#. Specifically 10#08 and 10#09 will be interpreted as valid decimal numbers, and not invalid octal numbers. (I'm taking the output of date +%S)
However, it seems I then can't use…
rojomoke
- 3,765
- 2
- 21
- 30
2
votes
9 answers
Unboxing Long in java
In some code I see this:
private void compute(Long a, Long b, Long c) {
long result = a-(b+c);
...
It seems a bit strange that the result is stored in a primitive long instead of a Long object corresponding to its operands.
Are there any…
u123
- 15,603
- 58
- 186
- 303
2
votes
6 answers
Little endian or Big endian
#include
union Endian
{
int i;
char c[sizeof(int)];
};
int main(int argc, char *argv[])
{
union Endian e;
e.i = 1;
printf("%d \n",&e.i);
printf("%d,%d,\n",e.c[0],&(e.c[0]));
…
tez
- 4,990
- 12
- 47
- 67