Test if number is odd or even
What is the simplest most basic way to find out if a number/variable is odd or even in PHP? Is it something to do with mod? I’ve tried a few scripts but.. google isn’t delivering at the moment. 19 Answers 19
numbers
Get decimal portion of a number with JavaScript
I have float numbers like 3.2 and 1.6. I need to separate the number into the integer and decimal part. For example, a value of 3.2 would be split into two numbers, i.e. 3 and 0.2 Getting the integer portion is easy: n = Math.floor(n); But I am having trouble getting the decimal portion. I … Read more
Allow 2 decimal places in
I have a <input type=”number”> and I want to restrict the input of the users to purely numbers or numbers with decimals up to 2 decimal places. Basically, I am asking for a price input. I wanted to avoid doing regex. Is there a way to do it? <input type=”number” required name=”price” min=”0″ value=”0″ step=”any”> … Read more
Convert boolean result into number/integer
I have a variable that stores false or true, but I need 0 or 1 instead, respectively. How can I do this? 18 Answers 18
Is there any way to prevent input type=”number” getting negative values?
I want to get only positive values, is there any way to prevent it using only html Please don’t suggest validation method 18 Answers 18
Check if a number has a decimal place/is a whole number
I am looking for an easy way in JavaScript to check if a number has a decimal place in it (in order to determine if it is an integer). For instance, 23 -> OK 5 -> OK 3.5 -> not OK 34.345 -> not OK if(number is integer) {…} 22 Answers 22
How can I set max-length in an HTML5 “input type=number” element?
For <input type=”number”> element, maxlength is not working. How can I restrict the maxlength for that number element? 30 Answers 30
How do I convert an integer to binary in JavaScript?
I’d like to see integers, positive or negative, in binary. Rather like this question, but for JavaScript. 15 Answers 15
How to format a floating number to fixed width in Python
How do I format a floating number to a fixed width with the following requirements: Leading zero if n < 1 Add trailing decimal zero(s) to fill up fixed width Truncate decimal digits past fixed width Align all decimal points For example: % formatter something like ‘{:06}’ numbers = [23.23, 0.123334987, 1, 4.223, 9887.2] for … Read more
Check if string contains only digits
I want to check if a string contains only digits. I used this: var isANumber = isNaN(theValue) === false; if (isANumber){ .. } But realized that it also allows + and -. Basically, I want to make sure an input contains ONLY digits and no other characters. Since +100 and -5 are both numbers, isNaN() … Read more
