Questions tagged [numbers]

A number is a mathematical object used to count, measure and label. Questions about using numbers in variables processing, numbers processing, conversion, display, logical numerical changes, data type existence, etc.For questions regarding phone numbers, please use tag [phone-number].

1135
votes
42answers
726k views

How to print a number with commas as thousands separators in JavaScript

I am trying to print an integer in JavaScript with commas as thousands separators. For example, I want to show the number 1234567 as "1,234,567". How would I go about doing this? Here is how I am ...
2129
votes
48answers
1.4m views

Validate decimal numbers in JavaScript - IsNumeric()

What's the cleanest, most effective way to validate decimal numbers in JavaScript?Bonus points for:Clarity. Solution should be clean and simple.Cross-platform.Test cases:01. IsNumeric('-1') ...
485
votes
15answers
272k views

How to sort an array of integers correctly

Trying to get the highest and lowest value from an array that I know will contain only integers seems to be harder than I thought.var numArray=[140000, 104, 99];numArray=numArray.sort();...
387
votes
20answers
719k views

Show a number to 2 decimal places

What's the correct way to round a PHP string to 2 decimal places?$number="520"; // It's a string from a DB$formatted_number=round_to_2dp($number);echo $formatted_number;The output should ...
462
votes
11answers
376k views

Formatting a number with leading zeros in PHP

I have a variable which contains the value 1234567.I would like it to contain exactly 8 digits, i.e. 01234567.Is there a PHP function for that?
263
votes
11answers
482k views

Python: Extract numbers from a string

I would extract all the numbers contained in a string. Which is the better suited for the purpose, regular expressions or the isdigit() method?Example:line="hello 12 hi 89"Result:[12, 89]
600
votes
39answers
537k views

How do I check that a number is float or integer?

How to find that a number is float or integer?1.25 --> float 1 --> integer 0 --> integer 0.25 --> float
38
votes
8answers
29k views

Integer with leading zeroes

When I write System.out.println(0123); I get 83 however System.out.println((int)0123F); prints 123.Why does it work that way?
97
votes
26answers
221k views

How to convert number to words in java

We currently have a crude mechanism to convert numbers to words (e.g. using a few static arrays) and based on the size of the number translating that into an english text. But we are running into ...
8
votes
10answers
34k views

Java arrays printing out weird numbers, and text [duplicate]

I'm new to programming. I'm sure the answer for this question is out there, but I have no idea what to search for. so um. ok, i'll go right to it.Here's my code: int[] arr;arr=new int[...
82
votes
7answers
20k views

Why does PHP consider 0 to be equal to a string?

I have the following piece of code:$item['price']=0;/*code to get item information goes in here*/if($item['price']=='e') {$item['price']=-1;}It is intended to initialize the item ...
71
votes
7answers
163k views

Large Numbers in Java

How would I go about doing calculations with extremely large numbers in Java? I have tried long but that maxes out at 9223372036854775807, and when using an integer it does not save enough digits ...
8
votes
2answers
14k views

Python math is wrong [duplicate]

Possible Duplicate:Python rounding error with float numbers Python 2.7.3 (v2.7.3:70274d53c1dd, Apr 9 2012, 20:52:43) [GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwinType "copyright", "...
49
votes
10answers
59k views

Matching numbers with regular expressions — only digits and commas

I can't figure out how to construct a regex for the example values:123,456,789-12,341234-8Could you help me?
61
votes
23answers
119k views

Generate unique random numbers between 1 and 100

How can I generate 8, say, unique random numbers between 1 and 100 using JavaScript?
693
votes
13answers
393k views

Can I hide the HTML5 number input’s spin box?

Is there a consistent way across browsers to hide the new spin boxes that some browsers (such as Chrome) render for HTML input of type number? I am looking for a CSS or JavaScript method to prevent ...
33
votes
6answers
163k views

Restricting JTextField input to Integers [duplicate]

I know that this question must have been asked and answered a million times, but I just can't find an easy solution. I have a JTextField that is meant to accept only positive integers as input. I need ...
48
votes
15answers
79k views

How to find the cumulative sum of numbers in a list?

time_interval=[4, 6, 12]I want to sum up the numbers like [4, 4+6, 4+6+12] in order to get the list t=[4, 10, 22].I tried the following:for i in time_interval:t1=time_interval[0]...
264
votes
21answers
433k views

How can I limit possible inputs in a HTML5 “number” element?

For <input type="number"> element, maxlength is not working. How can I restrict the maxlength for that number element?
50
votes
14answers
55k views

Evaluating a string as a mathematical expression in JavaScript

How do I parse and evaluate a mathematical expression in a string (e.g. '1+1') without invoking eval(string) to yield its numerical value?With that example, I want the function to accept '1+1' and ...
70
votes
17answers
350k views

Format numbers in JavaScript similar to C#

Is there a simple way to format numbers in JavaScript, similar to the formatting methods available in C# (or VB.NET) via ToString("format_provider") or String.Format()?
77
votes
13answers
102k views

How to compare two floating point numbers in Bash?

I am trying hard to compare two floating point numbers within a bash script. I have to variables, e.g.let num1=3.17648e-22let num2=1.5Now, I just want do a simple comparison of these two numbers:...
24
votes
7answers
32k views

How to mathematically evaluate a string like “2-1” to produce “1”?

I was just wondering if PHP has a function that can take a string like 2-1 and produce the arithmetic result of it?Or will I have to do this manually with explode() to get the values left and right ...
41
votes
12answers
42k views

Is there a way to convert number words to Integers?

I need to convert one into 1, two into 2 and so on.Is there a way to do this with a library or a class or anything?
234
votes
15answers
297k views

JavaScript get number from string

I have a string in javascript like `#box2' and I just want the '2' from it.Tried:var thestring=$(this).attr('href');var thenum=thestring.replace( /(^.+)(\w\d+\w)(.+$)/i,'$2');alert(thenum);...
28
votes
19answers
48k views

JavaScript numbers to Words

I'm trying to convert numbers into english words, for example 1234 would become: "one thousand two hundred thirty four".My Tactic goes like this:Separate the digits to three and put them on Array (...
94
votes
26answers
44k views

How to convert floats to human-readable fractions?

Let's say we have 0.33, we need to output "1/3". If we have "0.4", we need to output "2/5".The idea is to make it human-readable to make the user understand "x parts out of y" as a better way of ...
37
votes
6answers
28k views

Why is 08 not a valid integer literal in Java?

Why is 08 considered an out of range int but 07 and below are not?
188
votes
10answers
295k views

Format Float to n decimal places

I need to format a float to "n"decimal places.was trying to BigDecimal, but the return value is not correct...public static float Redondear(float pNumero, int pCantidadDecimales) {// the ...
130
votes
10answers
166k views

Phone: numeric keyboard for text input

Is there a way to force the number keyboard to come up on the phone for an <input type="text">? I just realized that <input type="number"> in HTML5 is for “floating-point numbers”, so it ...

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