boolean-logic

问题 Assuming 2 gate-delays for a Sum or Carry function, estimate the time for ripple-through carry addition for adders with the following word lengths:- i) 4-bit ii) 8-bit iii) 16-bit In my notes I have written: "delay is the word width times each bit stage delay (2 gate delays)". Therefore: i) 2*4 = 8 ii) 2*8 = 16 iii) 2*16 = 32 Looking at the ripple carry adder wikipedia page: http://en.wikipedia.org/wiki/Ripple_carry_adder#Ripple-carry_adder The formula used here is different, can anyone

问题 I'm trying to make a function that will compare multiple variables to an integer and output a string of three letters. I was wondering if there was a way to translate this into Python. So say: x = 0 y = 1 z = 3 mylist = [] if x or y or z == 0 : mylist.append("c") if x or y or z == 1 : mylist.append("d") if x or y or z == 2 : mylist.append("e") if x or y or z == 3 : mylist.append("f") which would return a list of ["c", "d", "f"] Is something like this possible? 回答1: You misunderstand how

问题 I'm using this code to enable a button when both fields are filled in and disable it when they aren't: if (jTextFieldAccountName.getText().isEmpty() && jPasswordFieldAccountPassword.getPassword().length == 0) { jButton_Next.setEnabled(false); } else { jButton_Next.setEnabled(true); } But the button is enabled even if I type in only one of the fields. Why? 回答1: Your statement is working fine. The way you have it written, the button is going to be disabled only when BOTH fields are empty (if

问题 A program that prints its input one word per line. int main() { int c; while ((c=getchar()) != EOF) { if (c== ' ' || c== '\n' ||c == '\t') putchar('\n'); else { putchar(c); } } return 0; } The above program prints the result correctly, one word per line. After changing the condition accordingly, I was expecting the program below to also print one word per line. However I am not getting the correct result. Am I making some silly mistake or is something wrong? int main() { int c; while ((c

问题 I am using Python. How to make a subselection of a vector, based on the values of two other vectors with the same length? For example this three vectors c1 = np.array([1,9,3,5]) c2 = np.array([2,2,3,2]) c3 = np.array([2,3,2,3]) c2==2 array([ True, True, False, True], dtype=bool) c3==3 array([False, True, False, True], dtype=bool) I want to do something like this: elem = (c2==2 and c3==3) c1sel = c1[elem] But the first statement results in an error: Traceback (most recent call last): File "

问题 In my project there is a Logic evaluation section, it take input as a string which contains logical expressions ( true/false ) . I want to evaluate this string and return a final Boolean value. string Logic="1&0|1&(0&1)" //string Logic="true AND false OR true AND (false AND true)" This will be my Logic . The length might increase. Is there any way to Evaluate this expression from LINQ / Dynamic LINQ ? 回答1: a way without any third party libraries is to use a DataTable with expression. There

问题 I'm sure this has been done before, I just can't find it. I need to turn something like, "((A OR B) AND C) OR D" into a database query for an attribute. Specifically I'm using Ruby Sequel. Can anyone point me at an example or utility or something that will keep me from reinventing the wheel? 回答1: You can define a grammar using ANTLR and automatically generate a Ruby parser for those type of strings. ANTLR is a parser generator and it allows you to define a grammar for a language (such as a

问题 On the following answer to a previous question someone mentioned an "auto-casting bool" I guess null has an auto-casting bool that is false. What is it, and what does the code that makes it look like? 回答1: The phrase "auto-casting bool" is a poor phrase someone used off hand. I believe what they mean is the internal ToBoolean operation Of special note is the if statement which calls ToBoolean on the expression. I don't know my way around the v8 source code but here is a search for ToBoolean

问题 Is it possible to assign the result of a test directly to a variable? I want to do something like c = ( a == b ) instead of if ( a == b ) { c = true; } else { c = false; } Is this possible? 回答1: Yes, of course. Which you can very easily test with the compiler. int a = 1, b = 2; bool c = a == b; 来源： https://stackoverflow.com/questions/18183591/c-assign-test-result-directly-to-variable

问题 i am having difficulty to discover how the operator AND function for a research with Youtube API. At the Youtube.Search i found the method setQ that explaing the logic for the operator NOT and OR but not for the operator AND. The main idea is to make a search that contains exactly both 2 parameters otherelse i can use the OR logic. Example: i want that 2 "fish" and "sea" should be both part of the metadata of the research. I have made an analysis on front-end call and it has this form: fish