modulo

Why does 2 mod 4 = 2?

点点圈 提交于 2019-11-28 15:29:25
I'm embarrassed to ask such a simple question. My term does not start for two more weeks so I can't ask a professor, and the suspense would kill me. Why does 2 mod 4 = 2? Jarsen Mod just means you take the remainder after performing the division. Since 4 goes into 2 zero times, you end up with a remainder of 2. Modulo is the remainder, not division. 2 / 4 = 0R2 2 % 4 = 2 The sign % is often used for the modulo operator, in lieu of the word mod . For x % 4 , you get the following table (for 1-10) x x%4 ------ 1 1 2 2 3 3 4 0 5 1 6 2 7 3 8 0 9 1 10 2 Modulo (mod, %) is the Remainder operator. 2

remquo Results Not Making Sense

北战南征 提交于 2019-11-28 12:45:37
问题 I read here that remquo should return: If successful, returns the floating-point remainder of the division x/y as defined in std::remainder, and a value whose sign is the sign of x/y and whose magnitude is congruent modulo 2 n to the magnitude of the integral quotient of x/y , where n is an implementation-defined integer greater than or equal to 3 . Now clearly I've misunderstood all that techno-speak cause I thought that I was going to get back the fractional result of the division. Instead

How to sort Integer digits in ascending order without Strings or Arrays?

人盡茶涼 提交于 2019-11-28 10:07:09
I'm trying to sort the digits of an integer of any length in ascending order without using Strings, arrays or recursion. Example: Input: 451467 Output: 144567 I have already figured out how to get each digit of the integer with modulus division: int number = 4214; while (number > 0) { IO.println(number % 10); number = number / 10; } but I don't know how to order the digits without an array. Don't worry about the IO class; it's a custom class our professor gave us. Timofey There's actually a very simple algorithm, that uses only integers : int number = 4214173; int sorted = 0; int digits = 10;

Weird Objective-C Mod Behavior for Negative Numbers

丶灬走出姿态 提交于 2019-11-28 09:35:29
So I thought that negative numbers, when mod'ed should be put into positive space... I cant get this to happen in objective-c I expect this: -1 % 3 = 2 0 % 3 = 0 1 % 3 = 1 2 % 3 = 2 But get this -1 % 3 = -1 0 % 3 = 0 1 % 3 = 1 2 % 3 = 2 Why is this and is there a workaround? result = n % 3; if( result < 0 ) result += 3; Don't perform extra mod operations as suggested in the other answers. They are very expensive and unnecessary. In C and Objective-C, the division and modulus operators perform truncation towards zero. a / b is floor(a / b) if a / b > 0 , otherwise it is ceiling(a / b) if a / b

Modulo operator in Objective-C returns the wrong result

蹲街弑〆低调 提交于 2019-11-28 07:21:47
问题 I'm a little freaked out by the results I'm getting when I do modulo arithmetic in Objective-C. -1 % 3 is coming out to be -1, which isn't the right answer: according to my understanding, it should be 2. -2 % 3 is coming out to -2, which also isn't right: it should be 1. Is there another method I should be using besides the % operator to get the correct result? 回答1: Objective-C is a superset of C99 and C99 defines a % b to be negative when a is negative. See also the Wikipedia entry on the

Find if variable is divisible by 2

喜你入骨 提交于 2019-11-28 04:26:26
How do I figure out if a variable is divisible by 2? Furthermore I need do a function if it is and do a different function if it is not. Use modulus: // Will evaluate to true if the variable is divisible by 2 variable % 2 === 0 Seriously, there's no jQuery plugin for odd/even checks? Well, not anymore - releasing "Oven" a jQuery plugin under the MIT license to test if a given number is Odd/Even. Source code is also available at http://jsfiddle.net/7HQNG/ Test-suites are available at http://jsfiddle.net/zeuRV/ (function() { /* * isEven(n) * @args number n * @return boolean returns whether the

Why is modulus different in different programming languages?

点点圈 提交于 2019-11-28 02:30:06
问题 Perl print 2 % -18; --> -16 Tcl puts [expr {2 % -18}] --> -16 but VBScript wscript.echo 2 mod -18 --> 2 Why the difference? 回答1: The wikipedia answer is fairly helpful here. A short summary is that any integer can be defined as a = qn + r where all of these letters are integers, and 0 <= |r| < |n|. Almost every programming language will require that (a/n) * n + (a%n) = a. So the definition of modulus will nearly always depend on the definition of integer division. There are two choices for

Other ways of performing modulo operation

家住魔仙堡 提交于 2019-11-28 01:34:41
问题 Some time ago I've seen somewhere a trick to perform modulo operation using bit operators. But now I cannot in any way perform proper operation. Anyone knows how to do it ? From what I remember it was faster than using %. 回答1: The "trick" is to binary AND a value with 1. Any odd number must have the first bit set to 1. So var foo = 7; if( foo & 1 ) { // true } Using a bitwise AND has a better performance in almost all platforms / browsers. for(var loop = 0; loop < 10; loop++) { if( loop & 1 )

How does modulus operation works with float data type?

这一生的挚爱 提交于 2019-11-28 00:11:49
I m trying to find out a simple modulus operation on float data type. float a=3.14f; float b=10f; result=a%b; I m getting result= 3.14 Another example using decimal data types: decimal p=10; decimal q=40; result=p%q; getting answer=20. I am not understanding how does modulus works? From the C# language spec on floating point remainder. In the case of x % y if x and y are positive finite values. z is the result of x % y and is computed as x – n * y , where n is the largest possible integer that is less than or equal to x / y . The C# language spec also clearly outlines the table of what to do

Is there a modulus (not remainder) function / operation?

坚强是说给别人听的谎言 提交于 2019-11-27 22:54:15
问题 In Rust (like most programming languages), the % operator performs the remainder operation, not the modulus operation. These operations have different results for negative numbers: -21 modulus 4 => 3 -21 remainder 4 => -1 println!("{}", -21 % 4); // -1 However, I want the modulus. I found a workaround ((a % b) + b) % b , but I don't want to reinvent the wheel if there's already a function for that! 回答1: Is there a modulus (not remainder!) function / operation in Rust? As far as I can tell,