numbers

问题 This question already has answers here : Regular Expression allow null or 1 to 9 digit (3 answers) Closed 3 years ago . Yesterday I was posting one question here Regular Expression allow null or 1 to 9 digit This was working fine after that I saw in my quantity field not taking 10, 100, 1002 etc. value. because these values also present 0(zero) digit. So Please help me. 回答1: If you want null or a number that starts from [1-9] but can contain [0-9] , the pattern is (^[1-9][0-9]*$)|(^$) please,

问题 C++ is displaying a number 3232235975 on QLabel as 3.23223e+9 , while on QCustomPlot axis as 3.23223*10^9 . I am not involving stream such as std::cout , that is why std::setprecision doesn't work for my case. Am actually working with QCustomPlot to plot graph with 12digit numbers on the axis. Is this C++ issue or is it QCustomPlot mechanism issue? How can I display all the digits of the number? Thanks EDIT: After receiving hint of setNumberPrecision() from @saeed, now the coordination is

问题 I'm trying to send a text message from my android application to Whatsapp to specific Contact. when I'm using below codes, I am succeed either to send message and have to pickup contact manually, or If Specific number chat window opens, but message is blank. So is it possible to do both with one intent ? Here is my code: I can share message to WhatsApp, but contact i have to choose manually: Intent i = new Intent(Intent.ACTION_SEND); i.setType("text/plain"); i.setPackage("com.whatsapp"); i

问题 I'm given a special font with numbers like that: As you can see on the 3 for example, some numbers descent below the baseline. What I like to achieve is, that these numbers don't go below the line and that it looks like this: In Word this can be easily set in the character settings for the same font. How can one render digits in TCPDF like this? I'm totally stuck there and have no clue how to proceed. Cheers for any help! 回答1: It can be done, but it's messy... In principle you'll have to do

问题 What way i can convert string with 16 digits and 2 fraction value to number ? Currently when I try to convert Number('1234567890123456.12') will became to 1234567890123456 . fraction values will be gone. I just want to confirm without using any third party lib can i convert this string to number ? 回答1: Unfortunately not. Javascript represents it's numbers using double precision floating point numbers. At 16 digits, it will only be able to store the integer component and not the part after the

问题 In lua, I would like to format an integer (or float) number to separate every three decimal places with a space (or a coma, as in US), so for example number 120000010 would be presented as 120 000 010 or 120,000,010 I have found this, but is there a way to achieve this using string.format, or any other way not involving custom implementation? 回答1: printf (and friends) can do it with the (according to the man page) SUSv2 format flag ' . So printf "%'d\n" 1000000 outputs 1,000,000 but lua doesn

问题 Is there a quick way to find if a string is a real number, short of reading it a character at a time and doing isdigit() on each character? I want to be able to test floating point numbers, for example 0.03001 . 回答1: If you mean an float as a real number this should work: def isfloat(str): try: float(str) except ValueError: return False return True Note that this will internally still loop your string, but this is inevitable. 回答2: >>> a = "12345" # good number >>> int(a) 12345 >>> b = "12345G

问题 I have searched for days for a way to sort a string as number in mysql. My rows look like this: order_column 1.1.2 1.1.100 1.1.1 Ordering ascending by this column in mysql will produce: 1.1.1 1.1.100 1.1.2 I am interested in getting the following result: 1.1.1 1.1.2 1.1.100 Is there a way to produce this result using SQL? Other possible values of my column: 28.1999.1.1 1 1.1.154.20 100.1.1.1.1.15 Thanks, i appreciate everybody's time. EDIT: Fast Relational method of storing tree data (for

问题 Why is it that the Number Class provides abstract methods for conversion methods for Double, Int, Long, and Float but not abstract methods for byte and short? Overall I am slightly confused on when to use Abstract methods, as I just began learning Java. Thanks for any insight anyone can offer. 回答1: One look at the source for them says why: public byte byteValue() { return (byte)intValue(); } public short shortValue() { return (short)intValue(); } They both rely on the fact that intValue()

问题 Im trying to format the output of numbers in php. I have an amount of posts that show up, and next to each user is the total of posts. But it shows that actual amount, i want it to show it in a shorter format, actually, just like they do here at SO with reputation any ideas? 回答1: <? $numbers = array(100,1000,15141,3421); function format_number($number) { if($number >= 1000) { return $number/1000 . "k"; // NB: you will want to round this } else { return $number; } } foreach($numbers as $number