long-integer

问题 there's a Java method Double.doubleToLongBits that basically gets a double and return a long with the same bits. How can I do it in C#? Thank you 回答1: BitConverter.DoubleToInt64Bits would be a good alternative. http://msdn.microsoft.com/en-us/library/system.bitconverter.doubletoint64bits.aspx 回答2: You'll want BitConverter.DoubleToInt64Bits 来源： https://stackoverflow.com/questions/6816691/double-doubletolongbits-equivalent-in-c

问题 This might be a silly thing but how is this possible that compiler will show this while Long.Max = 9223372036854775807 ? 回答1: You must have Long literals in Java ending with an L , adding an L to your integer will correct your issue, like so: Long s = 9223372036854775806L This is because by default Java interprets all integers as 32-bit ( int ), the suffix L ensures that your integer is interpreted as 64-bit. 回答2: just put 'l' or 'L' in the end of it and it will be ok, like: long a =

问题 If I have an assignment Long c = a + b; Is there an easy way to check that a + b is not bigger/smaller than Long.MAX_VALUE / Long.MIN_VALUE ? 回答1: Using Guava, it's as simple as long c = LongMath.checkedAdd(a, b); // throws an ArithmeticException on overflow which is, I'd like to think, very readable indeed. (LongMath Javadoc here.) For the sake of fairness, I'll mention that Apache Commons provides ArithmeticUtils.addAndCheck(long, long). If you want to know how they work, well, the answer

问题 I got a serial number form Java Date which convert into long-integer such as "1352101337000". The problem I met is how to analyze this long-integer number back to NSDate or NSString so that I can clear to know what time the serial number is displaying. Do anybody have solution for this case? 回答1: Use this, NSTimeInterval timeInMiliseconds = [[NSDate date] timeIntervalSince1970]; To change it back, NSDate* date = [NSDate dateWithTimeIntervalSince1970:timeInMiliseconds]; As per apple

问题 I need to store long strings in a database. the string may be 5 or 6 sentences long. do you think this is a good design strategy. or should I store an id for that string and then create a relationship with another table that contains the location of the file storing the string. could you please give advantages and disadvantages of both. the strings have been preprocessed and stored in the database. any modification would read the entire string and replace it completely. so you can assume that

问题 This question already has answers here : What is the difference between String and string in C#? (65 answers) What is 'long?' data type? (6 answers) Closed 3 years ago . In C#, what is the difference between Int64 and long? Example: long x = 123; Int64 x = 123; 回答1: There is no difference in the compiled code. They are aliases for the same thing. 来源： https://stackoverflow.com/questions/36876660/in-c-sharp-whats-the-difference-between-int64-and-long

问题 How to get an Integer instead of Long from JSON? I want to read JSON in my Java program, but when I get a JSON value which is a number, my parser returns a number of type Long . I want to get an Integer . I tried to cast the long to an integer, but java throws a ClassCastException ( java.lang.Long cannot be cast to java.lang.Integer ). I tried several things, such as first converting the long to a string, and then converting with Integer.parseInt(); but also that doesn't work. I am using json

问题 It a very simple question - convert a type long variable to a Nullable int type (int?). (see example below- not the actual code) int? y = 100; long x = long.MaxValue; y = x; I am getting compile time error. "Cannot implicitly convert type 'long' to 'int?'. An explicit conversion exists (are you missing a cast?). I do have the fix ( see below the solution section), My curiosity in posting the question is of the 3 solutions which one is recommended? Solution y = Convert.ToInt32(x); y = (int)x;

问题 Failing to get a detailed answer to my question here. I thought I would tackle it from a different angle. Would someone be able to explain what selection criteria are used for determining the underlying types for C99's fixed-width integer types: [u]int_fast[n]_t [u]int_least[n]_t [u]int[n]_t For a given processor, if 'long' and 'int' are the same size (sizeof(int) == sizeof(long)) then why would 'long' be used over 'int' or vice versa. 回答1: The whim of the author of <stdint.h> . Given that

问题 I need to run quite long query using FQL. The only way I found in facebook docs is passing it using GET method. Unfortunetely as far as I know, most web servers doesn't accept urls beyond some specified length. So the question is - what's the max url length facebook can handle? Is there any way to send the FQL query via POST so the limit can be avoided? 回答1: At the front end, Facebook servers run a LAMP (Linux, Apache, MySQL, and PHP) stack with Memcache (source: see here) With the Apache