logic

问题 I am trying to write a predicate permutation/2 so that it is true if and only if both arguments are list, one a permutation of the other. To do this, I've written the two helper predicates delete/3 and insert/3 . The first is true if and only if the third argument is the second argument, both lists, with the first instance of the element in the first argument removed. The second is true if and only if the third argument equals the second argument with the first argument (element) inserted.

问题 I am trying to write a predicate permutation/2 so that it is true if and only if both arguments are list, one a permutation of the other. To do this, I've written the two helper predicates delete/3 and insert/3 . The first is true if and only if the third argument is the second argument, both lists, with the first instance of the element in the first argument removed. The second is true if and only if the third argument equals the second argument with the first argument (element) inserted.

问题 I wanted to validate only for IP address accepting only 3 three dots after some numbers ex: Valid: 191.123.121.202 is valid which has 3 dots after some decimal. Invalid : 191..123.121.202 is invalid where 2 dots are in sequence Whole Point: wanted a robust IP validator $("input.onlynumberdecimal").keydown(function (event) { console.log(event.keyCode); if (event.shiftKey == true) { event.preventDefault(); } if ((event.keyCode >= 48 && event.keyCode <= 57) || (event.keyCode >= 96 && event

问题 So, I am making a game for my programming class as part of my final project. I'm just in the planning and experimenting stage at the moment and I decided to get a headstart on graphics and collisions. I first made my program just by experimenting with the Graphics class VB has to offer, instead of using PictureBox es. Alongside that, I added keyboard input to move an Image around. When I decided to add collision detection through the intersectsWith() method of the Image class, things became

问题 Ok I'm using getSharedPreferences to store my high score but before I fill it up I wanted to sort the scores into ascending order via and array, but if it finds a Score less than it in the first pos then it wont check the rest for the smallest? //function to add score to array and sort it public void addscoretoarray(int mScore){ for(int pos = 0; pos< score.length; pos++){ if(score[pos] > mScore){ //do nothing }else { //Add the score into that position score[pos] = mScore; break; } } sortArray

问题 So I ran into a situation today where some production code was failing precisely because a method performed exactly as documented in MSDN. Shame on me for not reading the documentation. However, I'm still scratching my head as to why it behaves this way, even if "by design", since this behavior is exactly opposite what I would have expected (and other, known behaviors) and therefore seems to violate the principle of least surprise. The All() method allows you to supply a predicate (such as a

问题 So I ran into a situation today where some production code was failing precisely because a method performed exactly as documented in MSDN. Shame on me for not reading the documentation. However, I'm still scratching my head as to why it behaves this way, even if "by design", since this behavior is exactly opposite what I would have expected (and other, known behaviors) and therefore seems to violate the principle of least surprise. The All() method allows you to supply a predicate (such as a

问题 I have two lists Schedule(Having Total Hours) And Registered (Having Time Intervals). I want to create a list that is having registered time covered with Schedule list total hours finished. See the Upper image. The resultant list is covering Registered Times and ENd if it doesn't find any registration for left hours. It will just create further times according to hours left with their types. 回答1: Take a look at this sample: class Task { public int duration; public string type; public int

问题 I have two lists Schedule(Having Total Hours) And Registered (Having Time Intervals). I want to create a list that is having registered time covered with Schedule list total hours finished. See the Upper image. The resultant list is covering Registered Times and ENd if it doesn't find any registration for left hours. It will just create further times according to hours left with their types. 回答1: Take a look at this sample: class Task { public int duration; public string type; public int

问题 In removing conditional branches from high-performance code, converting a true boolean to unsigned long i = -1 to set all bits can be useful. I came up with a way to obtain this integer-mask-boolean from input of a int b (or bool b ) taking values either 1 or 0 : unsigned long boolean_mask = -(!b); To get the opposite value: unsigned long boolean_mask = -b; Has anybody seen this construction before? Am I on to something? When a int value of -1 (which I assume -b or -(!b) does produce) is