long-integer

How to convert a String to long in javascript?

由 巧了我就是萌 提交于 2019-11-26 22:37:54
问题 I have a millisecond timestamp that I need to convert from a String to long. Javascript has a parseInt but not a parseLong . So how can I do this? Thanks Edit: To expand on my question slightly: given that apparently javascript doesn't have a long type, how can I do simple arithmetic with longs that are initially expressed as strings? E.g subtract one from the other to get a time delta? 回答1: JavaScript has a Number type which is a 64 bit floating point number*. If you're looking to convert a

Multiplication of two integers in C++

由 自古美人都是妖i 提交于 2019-11-26 22:26:15
问题 I have a pretty basic question, but I am not sure if I understand the concept or not. Suppose we have: int a = 1000000; int b = 1000000; long long c = a * b; When I run this, c shows negative value, so I changed also a and b to long long and then everything was fine. So why do I have to change a and b , when their values are in range of int and their product is assigned to c (which is long long )? I am using C/C++ 回答1: The int s are not promoted to long long before multiplication, they remain

Why do integer datatypes overflow silently rather than throwing exception

由 …衆ロ難τιáo~ 提交于 2019-11-26 21:51:15
问题 I have learnt(atleast in java) that integer/long values overflow silently and their values start over from minimum value on overflow rather than throwing any exception. I was using an external api for some file operations, in which max file size was being loaded from a property file. All was fine in my local testing environment. As soon as the code went to live environment, the max file size limit was not working at all. After two days of debugging/analyzing the code, there was no success at

The maximum string content length quota (8192) has been exceeded while reading XML data

由 放肆的年华 提交于 2019-11-26 20:53:37
I'm trying to pass a large string (24,000 to 50,000 characters) to a self-hosted TCP WCF service. I've upped the maxStringContentLength (everywhere) to 22008192. I read somewhere that I need to change the bindingConfiguration to "LargeBuffer" or "LongFields" but when I do this: <endpoint address="" binding="netTcpBinding" bindingConfiguration="LongFields" contract="ExStreamWCF.IService1"> or this: <endpoint address="" binding="netTcpBinding" bindingConfiguration="LargeBuffer" contract="ExStreamWCF.IService1"> My service won't start. I really need this error to go away. Any ideas? Thanks, Jason

What's the difference between long long and long

由 一笑奈何 提交于 2019-11-26 20:23:16
问题 What's the difference between long long and long? And they both don't work with 12 digit numbers (600851475143), am I forgetting something? #include <iostream> using namespace std; int main(){ long long a = 600851475143; } 回答1: On major 32-bit platforms: int is 32 bits long is 32 bits as well long long is 64 bits On major 64-bit platforms: int is 32 bits long is either 32 or 64 bits long long is 64 bits as well Going by the standard: int must be at least 16 bits long must be at least 32 bits

warning: left shift count >= width of type

由 孤者浪人 提交于 2019-11-26 20:05:03
问题 I'm very new to dealing with bits and have got stuck on the following warning when compiling: 7: warning: left shift count >= width of type My line 7 looks like this unsigned long int x = 1 << 32; This would make sense if the size of long on my system was 32 bits. However, sizeof(long) returns 8 and CHAR_BIT is defined as 8 suggesting that long should be 8x8 = 64 bits long. What am I missing here? Are sizeof and CHAR_BIT inaccurate or have I misunderstood something fundamental? 回答1: long may

Is “long long” = “long long int” = “long int long” = “int long long”?

由 时光总嘲笑我的痴心妄想 提交于 2019-11-26 19:03:03
问题 I found both long int long and int long long can compile for a variable type. Is there any difference between long int long , int long long , long long and long long int ? In general, is the type identical if it has the same number of long ? 1 long: long l; int long il; long int li; 2 long: long long ll; int long long ill; long int long lil; long long int lli; Also if above is right, are the following declarations also identical? long long* llp; int long long* illp; long int long* lilp; long

Why is long slower than int in x64 Java?

由 南笙酒味 提交于 2019-11-26 18:54:09
问题 I'm running Windows 8.1 x64 with Java 7 update 45 x64 (no 32 bit Java installed) on a Surface Pro 2 tablet. The code below takes 1688ms when the type of i is a long and 109ms when i is an int. Why is long (a 64 bit type) an order of magnitude slower than int on a 64 bit platform with a 64 bit JVM? My only speculation is that the CPU takes longer to add a 64 bit integer than a 32 bit one, but that seems unlikely. I suspect Haswell doesn't use ripple-carry adders. I'm running this in Eclipse

How to convert / cast long to String?

由 左心房为你撑大大i 提交于 2019-11-26 18:44:48
问题 I just created sample BB app, which can allow to choose the date. DateField curDateFld = new DateField("Choose Date: ", System.currentTimeMillis(), DateField.DATE | DateField.FIELD_LEFT); After choosing the date, I need to convert that long value to String, so that I can easily store the date value somewhere in database. I am new to Java and Blackberry development. long date = curDateFld.getDate(); How should I convert this long value to String? Also I want to convert back to long from String

node.js is there any proper way to parse JSON with large numbers? (long, bigint, int64)

由 别等时光非礼了梦想. 提交于 2019-11-26 16:49:47
问题 When I parse this little piece of JSON { "value" : 9223372036854775807 } that's what I get { hello: 9223372036854776000 } Is there any way to parse it properly? 回答1: Not with built-in JSON.parse. You'll need to parse it manually and treat values as string (if you want to do arithmetics with them there is bignumber.js) You can use Douglas Crockford JSON.js library as a base for your parser. EDIT: I created a package for you :) var JSONbig = require('json-bigint'); var json = '{ "value" :
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