long-integer

问题 I am using MongoDB via official Java API. I can store and retrive Long values without any extra effort. But when I try to accumulate these values using group() function, JavaScript interpreter converts everything into Doubles and the final result ends up being a Double. Here is my group command: { ... initial: { count: 0 }, reduce: "function (o, a) { a.count += o.count; }" } Is there a way to tell the interpreter that count is in fact a Long? Something like count: 0L or count: Long(0) ? Or

问题 I have a simple code first I use this Long.parseLong(4250120140405520712) And it works but when I do this Long.parseLong(42501201404055207123) It fails. Adding an extra digit makes it throw a Number Format Exception. Can someone please explain 回答1: Assuming you're parsing String s into long s: The first one works because the number 4250120140405520712 (19 digits) is less than the maximum possible long value, Long.MAX_VALUE, 9223372036854775807L . The second one fails because it's 20 digits

问题 I'm converting a C++ system from solaris (SUN box and solaris compiler) to linux (intel box and gcc compiler). I'm running into several problems when dealing with large "long double" values. (We use "long double" due to some very very large integers... not for any decimal precision). It manifests itself in several weird ways but I've simplified it to the following program. It's trying to increment a number but doesn't. I don't get any compile or runtime errors... it just doesn't increment the

问题 PROBLEM : Long list of directives openmp fortran77 c$omp parallel default(shared) private(i,k,i1,i2,i3,i4,i5, $ i6,x0,y0,z0,vnx0,vny0,vnz0,qs0) c$omp do Task to be performed c$omp end do c$omp end parallel I'm trying to compile the above program using ifort and it works fine. I have checked with the serial version and I get the same result ifort -openmp -parallel -o ./solve But when I try to compile using gfortran it doesn't work. gfortran -fopenmp I get the following error quinckedrop.f:2341

问题 Need something like intVal() but for bigger numbers, for example: 100001416147426. Is there a function like this in php? Can't find it. 回答1: You should use BC Math, it is designed to numbers of any size with PHP. The BC Math extensions offers several mathematic functions like: bcadd Add two arbitrary precision numbers bccomp — Compare two arbitrary precision numbers bcsqrt Get the square root of an arbitrary precision number ... On the PHP documentation site there is a small code example by

问题 I'm trying to use a hardcoded 64bit integer in a string variable. Simplfied I want to do something like this: $i = 76561197961384956; $s = "i = $i"; Which should result in s being: i = 76561197961384956 This does obviously not work as PHP cast big integers to float, therefore s is: i = 7.65611979614E+16 While several other methods like casting etc. fail, I found number_format() and use it like this: $s = "i = " . number_format($i, 0, '.', ''); But this results in s being: i =

问题 I have an SQLite database that I am using with jOOQ. When I use jOOQ's code generation tool, it builds all of the table and record classes as expected. However, all of the SQLite INTEGER columns turn into java.lang.Integer fields in the generated code. The problem is that SQLite INTEGER's can store up to a 64 bit signed integer, where java.lang.Integer is only a 32 bit signed integer. Is it possible to tell jOOQ to use java.lang.Long (which is 64 bit signed) for these columns? 回答1: In fact,

问题 In java, is an int guaranteed to always be of 32bit size and a long of 64bit size regardless of whether the architecture is 32 or 64 bit? 回答1: Java is platform independent. So int is 32-bits, and long is 64-bit. 回答2: The Java Tutorial page on primitive data types specifies the fixed sizes and makes no mention of underlying architecture having any influence int: The int data type is a 32-bit signed two's complement integer. It has a minimum value of -2,147,483,648 and a maximum value of 2,147

问题 now the newer error "narrowing conversion of long long int to long unsigned int inside {} [-Wnarrowing]" the source code relative to it: // Implements the joint conditional cummulative density functions for CP-nets // For node j in the lexicographic topological sort as defined by the dag code: // the table gives P( s, t | n, c, j ). // The number of rows in each table is the triangular number of min(c, j). #ifndef TABLES_H #define TABLES_H #include <random> // Mersenne Twister #include

问题 I'm trying to use a bitcoin address validator written in Python from here: This snippet gives me trouble though: def decode_base58(bc, length): n = 0 for char in bc: n = n * 58 + digits58.index(char) return n.to_bytes(length, 'big') I understand that n is either an int or a long, but neither has a method called to_bytes, so I don't really understand how this code could have ever worked? Does anybody know what's wrong here? Am I doing something wrong, or is this code simply written wrong? All