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• C++ converting hexadecimal md5 hash to decimal integer

  - by Zackery

  I'm doing Elgamal Signature Scheme and I need to use the decimal hash value from the message to compute S for signature generation. string hash = md5(message); cout << hash << endl; NTL::ZZ msgHash = strtol(hash.c_str(), NULL, 16); cout << msgHash << endl; There are no integer large enough to contain the…

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• Convert bit vector (array of booleans) to an integer, and integer to bit vector, in Java.

  - by dreeves

  What's the best way to unstub the following functions? // Convert a bit-vector to an integer. int bitvec2int(boolean[] b) { [CODE HERE] } // Convert an integer x to an n-element bit-vector. boolean[] int2bitvec(int x, int n) { [CODE HERE] } Or is there a better way to do that sort of thing than passing boolean arrays around? This…

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• Disabling identity (auto-incrementing) on integer primary key using code first

  - by gw0

  I am using code first approach in a ASP.NET MVC 3 application and all integer primary keys in models (public int Id { get; set; }) are by default configured as an identity with auto-incrementing. How to disable this and enable a way to manually enter the integer for the primary key? The actual situation is that the Id integers have a special…

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• String as \x03\x00\x00\x00 to integer

  - by marta

  Helo: I have a question, that I solved in c, but now I want to do it in hava: I have a String like: '\x03\x00\x00\x00' This is representing an hexadecimal value of a integer. I transform to 0x03\0x00... And now I want to obtain the integer, but I don't know how to do it in java could someone give me some idea ? Thanks in advance (Is it…

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• Why is DivMod Limited to Words (<=65535)?

  - by Andreas Rejbrand

  In Delphi, the declaration of the DivMod function is procedure DivMod(Dividend: Cardinal; Divisor: Word; var Result, Remainder: Word); Thus, the divisor, result, and remainder cannot be grater than 65535, a rather severe limitation. Why is this? Why couldn't the delcaration be procedure DivMod(Dividend: Cardinal; Divisor: Cardinal; …

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• Division by zero: Undefined Behavior or Implementation Defined in C and/or C++ ?

  - by SiegeX

  Regarding division by zero, the standards say: C99 6.5.5p5 - The result of the / operator is the quotient from the division of the first operand by the second; the result of the % operator is the remainder. In both operations, if the value of the second operand is zero, the behavior is undefined. C++03 5.6.4 - The binary /…

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• PHP validating integers

  - by Mikk

  Hi, I was wondering, what would be the best way to validate an integer. I'd like this to work with strings as well, so I could to something like (string)+00003 - (int)3 (valid) (string)-027 - (int)-27 (valid) (int)33 - (int)33 (valid) (string)'33a' - (FALSE) (invalid) That is what i've go so far: function parseInt($int){ …

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• Check if Integer is Positive or Negative - Objective C

  - by Kevin

  Hello, How can I tell in objective-c coding if an integer is positive or negative. I'm doing this so that I can write an "if" statement stating that if this integer is positive then do this, and if its negative do this. Thanks, Kevin

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• Strange Integer.parseInt exception

  - by Albinoswordfish

  Exception in thread "Thread-2" java.lang.NumberFormatException: For input string: "3" int test = Integer.parseInt(result[0]); This is the error I keep getting when I'm trying to convert "3" to an integer. Well I'm receiving this "3" through a RS-232 port, so maybe this is what is causing the error. If anybody has any idea…

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• scala integer weirdness

  - by williamstw

  Suppose you inadvertently use Integer instead of Int, as in this code: import scala.collection.mutable.Map val contributors = Map[String,Integer]() val count = contributors.getOrElseUpdate("john",0) contributors.put("john",count+1) println(contributors) Compiler output: (fragment of test.scala):7: error: type mismatch;…

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• ABAP - increment an integer

  - by Ben

  Hi there, sometimes ABAP drives me crazy with really simple tasks - as incrementing an integer within a loop... Here's my try: METHOD test. DATA: lv_id TYPE integer. lv_id = 1. LOOP AT x ASSIGNING <y>. lv_id = lv_id+1. ENDLOOP. ENDMETHOD. This gives me a strange error I can hardly…

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• Find maximum positive integer value in Bourne Shell

  - by l0b0

  I'm checking a counter in a loop to determine if it's larger than some maximum, if specified in an optional parameter. Since it's optional, I can either default the maximum to a special value or to the maximum possible integer. The first option would require an extra check at each iteration, so I'd like to instead find…

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• Finding N contiguous zero bits in an integer to the left of the MSB position of another integer

  - by James Morris

  The problem is: given an integer val1 find the position of the highest bit set (Most Significant Bit) then, given a second integer val2 find a contiguous region of unset bits, with the minimum number of zero bits given by width to the left of the position (ie, in the higher bits). Here is the C code for my solution: …

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• Insert the lowest possible unique positve integer in an atomic fashion in MySql

  - by Jason Christa

  Say I have a table with a unique positive integer field. I currently have rows with id's of [1, 2, 3, 4, 5, 8, 12, 35]. Is there a insert query that I could write that would assign the id field to the lowest unique positive integer (in this case 6)? It would have to do this atomically so there isn't the possibility of…

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• Difference in storage of integer values and float values

  - by viswanathan

  Integer and Float use 4 bytes of memory for storage. However the range of integer and float are different. How are they stored internally in memory?

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• Why toInteger :: Int -> Integer is lazy?

  - by joppux

  I have the following code: {-# NOINLINE i2i #-} i2i :: Int -> Integer i2i x = toInteger x main = print $ i2i 2 Running GHC with -ddump-simpl flag gives: [Arity 1 NoCafRefs Str: DmdType U(L)] Main.i2i = GHC.Real.toInteger1 Seems that conversion from Int to Integer is lazy. Why is it so - is there a case…

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• Drawbacks of using an integer as a bitfield?

  - by Mark

  I have a bunch of boolean options for things like "accepted payment types" which can include things like cash, credit card, cheque, paypal, etc. Rather than having a half dozen booleans in my DB, I can just use an integer and assign each payment method an integer, like so PAYMENT_METHODS = ( (1<<0,…

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• set integer value as bit mask

  - by Vladimir

  What is simplest way to assign a bit mask to integer value? For example I want integer with first, third and forth bits = 1, other = 0.

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• How to find the nearest integer to a specified integer from a table of integers?

  - by corrilaz

  How to find the nearest integer upon the provided one? Say, I have the following integers in the mysql database: 405, 600, 304. The question is how to I select 600 upon providing 550 or select 304 upon providing 300 (ie, so as to find the nearest integer)? i am talking about INTEGERS, not floats.

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• Updating an integer defined column in a MySQL DB with PHP

  - by Zloy Smiertniy

  I have a table defined like this: create table users ( id int(10), age int(3), name varchar (50) ) I want to use a query to update just age, which is an integer, that comes from an html form. When it arrives to the method that updates it, it comes as a string, so I change it to integer with PHP and…

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• new Integer vs valueOf

  - by LB

  Hi, I was using Sonar to make my code cleaner, and it pointed that I'm using new Integer(1) instead of Integer.valueOf(1). Because it seems that valueOf does not instantiate a new object so is more memory-friendly. How can valueOf not instantiate a new object ? How does it work ? Is this true for all…

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• [C++] Converting Integer to a Byte Representation

  - by bobber205

  How can I convert a integer to it's byte representation. I want to take an integer and return a vector that has contains 1's and 0's of the integers byte representation. I'm having a heck of a time trying to do this myself so I'd thought I would ask to see if there was a built in library function…

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• How to hard define in code a matrix Integer[][]

  - by Pentium10

  Question is simple for an expert: Integer[][] res= new Integer[][] {.....hard code some values here on 2 dim...} How to I return here 2 rows and 3 values like this 1 2 3 4 5 6

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• ON DELETE RESTRICT Causing Error 150

  - by Levi Hackwith

  CREATE TABLE project ( id INTEGER NOT NULL AUTO_INCREMENT, created_at DATETIME NOT NULL, name VARCHAR(75) NOT NULL, description LONGTEXT NOT NULL, is_active TINYINT NOT NULL DEFAULT '1', PRIMARY KEY (id), INDEX(name, created_at) ) ENGINE = INNODB; CREATE TABLE role ( …

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• How Does Modulus Divison Work

  - by NSWOA

  I don't really understand how modulus division works. I was calculating 27 % 16 and wound up with 11 and I don't understand why. I can't seem to find an explanation in layman's terms online. Can someone elaborate on a very high level as to what's going on here? EDIT: Thanks for all your answers.…

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