definition

问题 Every time I call myGrid in the generateBoard method, I get the error: non-static variable myGrid cannot be referenced from static context To my understanding, this shouldn't happen, because I've set the array to be public and should be able to be accessed from any other class. So have I set up the array incorrectly? import java.util.Random; public class Zombies { private int Level = 1; private int MoveNo = 0; public int[][] myGrid = new int[12][12]; public static void generateBoard() {

问题 Consider the code: window.a = function(x){ var r = x*2; window.a =alert; // redefines itself after first call return r; }; a('2 * 2 = '+a(2)); // doesn't work. it should've alerted "2 * 2 = 4" This doesn't work either: window.a = function(x){ alert(x); window.a = function(x){ // redefines itself after first call var r = x*2; return r; } }; a('2 * 2 = '+a(2)); // doesn't work. it should've alerted "2 * 2 = 4" As neither does this: window.a = function(x){ alert(x); window.c = window.a; window.a

问题 How do I do mutually recursive definitions in Clojure? Here is a code in Scala to find prime numbers which uses recursive definitions: val odds: Stream[Int] = cons(3, odds map { _ + 2 }) val primes: Stream[Int] = cons(2, odds filter isPrime) def primeDivisors(n: Int) = primes takeWhile { _ <= Math.ceil(Math.sqrt(n))} filter { n % _ == 0 } def isPrime(n: Int) = primeDivisors(n) isEmpty primes take 10 I translated this to Clojure: (def odds (iterate #(+ % 2) 3)) (def primes (cons 2 (filter is

问题 What is an unbounded array and is there any difference between an unbounded array and a dynamically allocated array? What are the common operations associated with the unbounded array? (like we have pop and push for stack data structure) 回答1: Unbounded arrays can be (and usually are) statically allocated. The primary concern when implementing an unbounded array is to provide dynamic-array like freedom to decide the array size during run-time without the performance penalties of run-time

问题 I want to create a structure with a variable name in a matlab script. The idea is to extract a part of an input string filled by the user and to create a structure with this name. For example: CompleteCaseName = input('s'); USER WRITES '2013-06-12_test001_blabla'; CompleteCaseName = '2013-06-12_test001_blabla' casename(12:18) = struct('x','y','z'); In this example, casename(12:18) gives me the result test001 . I would like to do this to allow me to compare easily two cases by importing the

问题 I'm new to Scala and I'm having a problem understanding this. Why are there two syntaxes for the same concept, and none of them more efficient or shorter at that (merely from a typing standpoint, maybe they differ in behavior - which is what I'm asking). In Go the analogues have a practical difference - you can't forward-reference the lambda assigned to a variable, but you can reference a named function from anywhere. Scala blends these two if I understand it correctly: you can forward

问题 I am trying to define a complex type (i.e, a type that consists of both a real and imaginary part) and am trying to find out a way to make it generic. This my current static code: type complex_vector is record Re : signed(15 downto 0); Im : signed(15 downto 0); end record; Now I wonder whether there is a way to make this generic, in in other word something like: type complex_vector (Generic: Integer := WIDTH) is record Re : signed(WIDTH downto 0); Im : signed(WIDTH downto 0); end record; I

问题 I'm trying to create a definition list of term-definition pairs, each pair existing on a single, separate line. I've tried making dt s and dd s display:inline , but then I lose the line breaks between the pairs. How do I make sure I have a line for each pair (and not for each individual term/definition)? Example: <dl> <dt>Term 1</dt><dd>Def 1</dd> <dt>Term 2</dt><dd>Def 2</dd> </dl> yielding: Term 1 Def 1 Term 2 Def 2 The CSS for making them inline would be: dt,dd{display:inline;} yielding:

问题 The DOA ( or more appropriately, Dead Before Arrival ) XHTML2 working standard indicates support for the <di> tag. [...] The term and its definition can be grouped within a di element to help clarify the relationship between a term and its definition(s). To clarify, this tag would be used to group <dt> and <dd> tags together under a <dl> : <dl> <di> <dt>defenestrate</dt> <dd>throw through or out of the window; "XHTML2 was defenestrated"</dd> <dd>what I will do if web standards keep going they

问题 I'm asking which is the best practice between this two implementation: for ( int i = 0; i < 5; i++ ) for ( int j = 0; j < 5; j++ ) ...some code here... ...other code... for ( int i = 0; i < 5; i++ ) for ( int j = 0; j < 5; j++ ) ...some code here... or this one: beginning of function/main int i,j; ...some code... for ( i = 0; i < 5; i++ ) for ( j = 0; j < 5; j++ ) ...some code here... ...other code... for ( i = 0; i < 5; i++ ) for ( j = 0; j < 5; j++ ) ...some code here... In other words is