Configure android EditText to allow decimals and negatives
You are just missing this in your EditText, android:inputType=”numberDecimal|numberSigned”
decimal
C# Why can equal decimals produce unequal hash values?
To start with, C# isn’t doing anything wrong at all. This is a framework bug. It does indeed look like a bug though – basically whatever normalization is involved in comparing for equality ought to be used in the same way for hash code computation. I’ve checked and can reproduce it too (using .NET 4) … Read more
Limit to 2 decimal places with a simple pipe
Currency pipe uses the number one internally for number formatting. So you can use it like this: {{ number | number : ‘1.2-2’}}
MongoDB – What about Decimal type of value?
If you want an exact representation for financial purposes, then doubles or floating point values are unsuitable as the fractional parts are subject to rounding error. Certain decimal values cannot not be represented using binary-based floating points and must be approximated. For a less technical intro, see The trouble with rounding floating point numbers; if … Read more
Best practice for working with currency values in PHP?
As of MySQL v5.0.3, MySQLs DECIMAL datatype stores an exact decimal number, i.e. not an inaccurate floating point representation. To correctly manipulate precision numbers in PHP use the arbitrary precision math functions. Internally this library manipulates text strings. Currency is intended to be stored as a decimal number, you can get units of money smaller … Read more
Round a decimal to the nearest quarter in C#
Multiply it by four, round it as you need to an integer, then divide it by four again: x = Math.Round (x * 4, MidpointRounding.ToEven) / 4; The various options for rounding, and their explanations, can be found in this excellent answer here 🙂
C# Type suffix for decimal
0m is how you say (decimal)0 because m is the suffix that means decimal. Other suffixes are f for float, d for double, u for unsigned, and l for long. They can be either upper- or lower-case and u can be combined with l in either order to make a ulong. Although the suffixes are … Read more
How do I format a number to 2 decimal places, but only if there are already decimals?
This should do the job: var formattedNumber = (x * 1.5).toFixed(2).replace(/[.,]00$/, “”);
Clarification on the Decimal type in Python
The Decimal class is best for financial type addition, subtraction multiplication, division type problems: >>> (1.1+2.2-3.3)*10000000000000000000 4440.892098500626 # relevant for government invoices… >>> import decimal >>> D=decimal.Decimal >>> (D(‘1.1’)+D(‘2.2’)-D(‘3.3’))*10000000000000000000 Decimal(‘0.0’) The Fraction module works well with the rational number problem domain you describe: >>> from fractions import Fraction >>> f = Fraction(1) / Fraction(3) >>> … Read more
Conversion of a decimal to double number in C# results in a difference
Interesting – although I generally don’t trust normal ways of writing out floating point values when you’re interested in the exact results. Here’s a slightly simpler demonstration, using DoubleConverter.cs which I’ve used a few times before. using System; class Test { static void Main() { decimal dcm1 = 8224055000.0000000000m; decimal dcm2 = 8224055000m; double dbl1 … Read more