long-integer

Hibernate returns BigIntegers instead of longs

蹲街弑〆低调 提交于 2019-12-01 03:03:41
This is my Sender entity @Entity public class Sender { @Id @GeneratedValue(strategy = GenerationType.AUTO) private long senderId; ... ... public long getSenderId() { return senderId; } public void setSenderId(long senderId) { this.senderId = senderId; } } When I try to execute following query: StringBuilder query = new StringBuilder(); query.append("Select sender.* "); query.append("From sender "); query.append("INNER JOIN coupledsender_subscriber "); query.append("ON coupledsender_subscriber.Sender_senderId = sender.SenderId "); query.append("WHERE coupledsender_subscriber.Subscriber

What is meant by the most restrictive type in C?

旧巷老猫 提交于 2019-12-01 02:55:11
The book The C Programming Language talks about "the most restrictive type" in section 8.7, Example — A Storage Allocator : Although machines vary, for each machine there is a most restrictive type: if the most restrictive type can be stored at a particular address, all other types may be also. On some machines, the most restrictive type is a double ; on others, int or long suffices. In their code, the union header is aligned using the type long . What is meant by the most restrictive type? Is it perhaps the largest type (e.g., double ), or is there another approach? CPUs often require that

“OverflowError: Python int too large to convert to C long” on windows but not mac

蹲街弑〆低调 提交于 2019-12-01 02:47:05
I am running the exact same code on both windows and mac, with python 3.5 64 bit. On windows, it looks like this: >>> import numpy as np >>> preds = np.zeros((1, 3), dtype=int) >>> p = [6802256107, 5017549029, 3745804973] >>> preds[0] = p Traceback (most recent call last): File "<pyshell#13>", line 1, in <module> preds[0] = p OverflowError: Python int too large to convert to C long However, this code works fine on my mac. Could anyone help explain why or give a solution for the code on windows? Thanks so much! You'll get that error once your numbers are greater than sys.maxsize : >>> p = [sys

What is the modulo operator for longs in Java?

非 Y 不嫁゛ 提交于 2019-12-01 02:44:47
How do I find the modulo (%) of two long values in Java? My code says 'Integer number too large' followed by the number I'm trying to mod. I tried casting it to a long but it didn't work. Do I have to convert it to a BigInteger and use the remainder method? Thanks. The % operator does work for longs. It sounds like you may have forgotten to stick L at the end of a numeric literal, as in 123456789L . Can we see your code? You can only have an integer up to 2 147 483 647. If you want to go bigger than that, say 3 billion, you must specify it to be a long class Descartes { public static void main

Java JDK - possible lossy conversion from double to int

守給你的承諾、 提交于 2019-12-01 01:38:52
So I have recently written the following code: import java.util.Scanner; public class TrainTicket { public static void main (String args[]) { Scanner money = new Scanner(System.in); System.out.print("Please type in the type of ticket you would like to buy.\nA. Child B. Adult C. Elder."); String type = money.next(); System.out.print("Now please type in the amount of tickets you would like to buy."); int much = money.nextInt(); int price = 0; switch (type) { case "A": price = 10; break; case "B": price = 60; break; case "C": price = 35; break; default: price = 0; System.out.print("Not a option ;

Java - Can't make ProjectEuler 3 Work for a very big number (600851475143)

南笙酒味 提交于 2019-12-01 01:23:27
Resolution: It turns out there is (probably) "nothing wrong" with the code itself; it is just inefficient. If my math is correct, If I leave it running it will be done by Friday, October 14, 2011. I'll let you know! Warning: this may contain spoilers if you are trying to solve Project Euler #3. The problem says this: The prime factors of 13195 are 5, 7, 13 and 29. What is the largest prime factor of the number 600851475143 ? Here's my attempt to solve it. I'm just starting with Java and programming in general, and I know this isn't the nicest or most efficient solution. import java.util

Unsigned arithmetic and integer overflow

拥有回忆 提交于 2019-12-01 01:08:16
I am trying to understand arithmetic overflow. Suppose I have the following, unsigned long long x; unsigned int y, z; x = y*z; y*z can lead to an integer overflow. Does casting one of the operands to an unsigned long long alleviate this issue. What is the expected result of the multiplication of a 64-bit operand with a 32-bit operand? unsigned long long x; unsigned int y, z; x = y*z; The evaluation of the expression y*z is not affected by the context in which it appears. It multiplies two unsigned int values, yielding an unsigned int result. If the mathematical result cannot be represented as

How big is the precision loss converting long to double?

蓝咒 提交于 2019-12-01 00:14:22
问题 I have read in different post on stackoverflow and in the C# documentation, that converting long (or any other data type representing a number) to double loses precision. This is quite obvious due to the representation of floating point numbers. My question is, how big is the loss of precision if I convert a larger number to double ? Do I have to expect differences larger than +/- X ? The reason I would like to know this, is that I have to deal with a continuous counter which is a long . This

Format a number to display a comma when larger than a thousand

倾然丶 夕夏残阳落幕 提交于 2019-11-30 23:51:24
问题 I am writing some code in Visual Basic.net and have a question. If I have a long number, that is larger than 1000, how can I format this value to be 1,000 (with a comma) and for this to be stored in a string? For e.g. 1234 will be stored as 1,234 12345 will be stored as 12,345 123456 will be stored as 123,456 Is this done with a TryParse statement? May I have some help to so this? 回答1: Take a look at The Numeric ("N") Format Specifier General use: Dim dblValue As Double = -12445.6789 Console

What is meant by the most restrictive type in C?

安稳与你 提交于 2019-11-30 23:48:01
问题 The book The C Programming Language talks about "the most restrictive type" in section 8.7, Example — A Storage Allocator : Although machines vary, for each machine there is a most restrictive type: if the most restrictive type can be stored at a particular address, all other types may be also. On some machines, the most restrictive type is a double ; on others, int or long suffices. In their code, the union header is aligned using the type long . What is meant by the most restrictive type?