decimal

问题 I have little experience with MongoDB. I am usual working on large scale SQL server DBs. MongoDB only supports double and there is no decimal . The C# driver serializes decimals as strings. What functionality do I miss if I store decimals as strings in MongoDB? Is there a way to set a default serialization of decimals as double (AllowTruncation) without having to put an Attribute on each property? What do I lose in precision if I used Bson double? Thanks for your help! UPDATE I have an

问题 Is there a way to print a decimal as a percentage, so only the two digits after the period? My decimals will always be between 1 and 0, so I suppose it would work to call number.round(2) starting with the third character, but I can't find the syntax for that anywhere. To clarify, I want the number to be stored as a full decimal , but printed as a percentage . 回答1: You are probably going to want to use the number_to_percentage method. From the documentation, here are some examples of how to

问题 I have an amount field which is a decimal in the database. I need to always display this amount with 10 numbers on the left of the decimal and two after. Example: Amount = 245.00 which should display as 0000000245.00 Additionally, the amount could be over 1,000 or 10,000 which should display as: 0000001245.00 and 0000011245.00 How can I format the amount to always have the appropriate number of zeros on the left side of the decimal with a variable amount size? 回答1: You should put 0's in your

问题 Closed . This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 5 years ago . I'm trying to convert a number from decimal to base 6 and vice versa, but it's not working. It seems that I'm not figuring out the algorithm to get it to work. Could someone please explain to me how to implement it in Python? Here is a link(Click here) which gives an explanation on how to do it,

问题 I found an explanation to decode hex-representations into decimal but only by using Qt: How to get decimal value of a unicode character in c++ As I am not using Qt and cout << (int)c does not work (Edit: it actually does work if you use it properly..!) : How to do the following: I got the hex representation of two chars which were transmitted over some socket (Just figured out how to get the hex repr finally!..) and both combined yield following utf16-representation : char c = u"\0b7f" This

问题 I'm using double i2 = value * 2.23694; i2 = (double)(Math.round(i2 * 100)) / 100; for rounding doubles. But it rounds to only 2 decimal places. I want it to be 6 decimal places. Is there any way to use Math.round and have 6 decimal places? 回答1: You are casting things to Integer s which will ruin any rounding. To use double s, use a decimal point (i.e 100.0 instead of 100 ). And if you want it with 6 decimals, use 1000000.0 like this: double i2 = value * 2.23694; i2 = Math.round(i2*1000000.0)

问题 This question already has answers here : Round to at most 2 decimal places (only if necessary) (72 answers) Closed 4 years ago . I am trying to limit the returned number to be only 2 decimal places but this code isn't working for me; function myFunction() { var x = document.getElementById("mySelect").value; document.getElementById("demo").innerHTML = "Result is: " + x * 1.09; value = valToRound.toFixed(2); } What am I doing wrong? 回答1: Typing in the JS Browser console x = 2.71828 x.toFixed(2)

问题 I have almost completed this code, but it has told me that There is an illegal modifier in the public static int power; line. Can you guys please help? public static int binToDec(int i) { int[] numbers;//initialize variable int f = 4; String iString = "" + i; int result = 0; int length = iString.length(); public static int power; for(power = iString.length(); power>=0;power--) { while(f == length && f >= 0) { numbers[power] = iString.charAt(power)^power; } length--; f--; } for(int g = 0; g <=

问题 I am trying to convert a floating point number to string. I know you can do it using ostringstream & sprintf etc. but in the project I am working I am trying to do it using my own functions only (I am creating my own string class without using any outside functions). I don't want a perfect representation e.g. I don't mind it if this happens with large or small number: 1.0420753e+4 like it does with the standard stringstream. I know how floating point numbers work (e.g. sign, exponent,

问题 I'm learning Computer Science course and when I read to these definition, I understand. But I don't know what different purpose of two presentations and why. Here some short explanation of purpose that my book said: Zone decimal : hightly compatible with text data. Packed decimal : faster computing speed. Something I want to know is: 1) in zone decimal presentation there is a zone section that duplicate every digit. Why ? I see this is no purpose :( 2) why they say zone decimal is compatible