bigint

问题 http://www.leemon.com/crypto/BigInt.js I am using the leemon bigint.js library, but I am having trouble figuring out how to divide one big number by another. Here is what I have so far: var a = str2bigInt("100",10); var b = int2bigInt("5", 10); var result = []; var r = []; divide_(a,b,result,r) alert(bigInt2str(result,10)); but when I alert(result) the output is 0. The result should be 20? Can anybody see what I am doing wrong? Cheers 回答1: Apparently, this BigInt.js library expects the result

问题 This question already has answers here : SQL Server 2008: Error converting data type nvarchar to float (3 answers) Closed 6 years ago . I have a table with a field of type NTEXT which stores many type of values, filesize among them. I'm trying to run a query on a list of records and add up the file sizes but I'm encountering this perplexing problem. Since NTEXT cannot be directly/implicitly converted to INT or BIGINT , I'm converting it first to VARCHAR then I'm trying to convert it to either

问题 I'm trying to store in timestamp with timezone field my value. It is in milliseconds from 1970. select TO_CHAR(TO_TIMESTAMP(1401432881230), 'DD/MM/YYYY HH24:MI:SS.MS') Expected 30/5/2014 11:29:42 10:54:41.230 , but get 22/08/46379 23:27:02.000 回答1: Unix timestamps measures time with seconds, and not milliseconds ( almost everywhere, in PostgreSQL too). Therefore you need to call SELECT TO_TIMESTAMP(1401432881230 / 1000); If you want to preserve milliseconds, call with double precision :

问题 I'm trying to store in timestamp with timezone field my value. It is in milliseconds from 1970. select TO_CHAR(TO_TIMESTAMP(1401432881230), 'DD/MM/YYYY HH24:MI:SS.MS') Expected 30/5/2014 11:29:42 10:54:41.230 , but get 22/08/46379 23:27:02.000 回答1: Unix timestamps measures time with seconds, and not milliseconds ( almost everywhere, in PostgreSQL too). Therefore you need to call SELECT TO_TIMESTAMP(1401432881230 / 1000); If you want to preserve milliseconds, call with double precision :

问题 Notice For a solution in Erlang or C / C++ , go to Trial 4 below. Wikipedia Articles Integer square root The definition of "integer square root" could be found here Methods of computing square roots An algorithm that does "bit magic" could be found here [ Trial 1 : Using Library Function ] Code isqrt(N) when erlang:is_integer(N), N >= 0 -> erlang:trunc(math:sqrt(N)). Problem This implementation uses the sqrt() function from the C library, so it does not work with arbitrarily large integers

问题 In a research project of mine I'm writing C++ code. However, the generated assembly is one of the crucial points of the project. C++ doesn't provide direct access to flag manipulating instructions, in particular, to ADC but this shouldn't be a problem provided the compiler is smart enough to use it. Consider: constexpr unsigned X = 0; unsigned f1(unsigned a, unsigned b) { b += a; unsigned c = b < a; return c + b + X; } Variable c is a workaround to get my hands on the carry flag and add it to

问题 In a research project of mine I'm writing C++ code. However, the generated assembly is one of the crucial points of the project. C++ doesn't provide direct access to flag manipulating instructions, in particular, to ADC but this shouldn't be a problem provided the compiler is smart enough to use it. Consider: constexpr unsigned X = 0; unsigned f1(unsigned a, unsigned b) { b += a; unsigned c = b < a; return c + b + X; } Variable c is a workaround to get my hands on the carry flag and add it to

问题 So let me start by saying that I'm a newbie with little to moderate knowledge about C#. Coming to the topic: I need to make a program that is able to add/subtract very large integers. Initially, used BigInt only to find out it's not allowed. There should be a logical workaround for this? I have an idea which is using "elementary school method" where you add each digit starting from right to left. I made a string which I split into char array and added each digit from right to left

问题 I'm trying to parse 100 50-digit numbers from string with below piece of code: val input = """37107287533902102798797998220837590246510135740250 |46376937677490009712648124896970078050417018260538 |74324986199524741059474233309513058123726617309629""".stripMargin val list = input.split("""\n""").map(BigInt(_)) but I'm ending with "java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)". I don't have any idea why this does not work, since when string is splited, each

问题 This question already has an answer here : SQL Server varbinary bigint with BitConverter.ToInt64 values are different (1 answer) Closed 6 years ago . I am trying to create a universal hashing alogrithim that hashes a string as a 64 bit int. I am able to hash the strings correctly: sql: select convert ( varchar(64), HASHBYTES ( 'SHA1', 'google.com' ), 2 ) returns BAEA954B95731C68AE6E45BD1E252EB4560CDC45 C# System.Security.Cryptography.SHA1 c = System.Security.Cryptography.SHA1.Create(); System