logic

问题 This question already has answers here : Using wire or reg with input or output in Verilog (5 answers) Closed 3 years ago . I'm confused about reg and wire when I was doing my homework. I could not understand differences between reg and wire exactly. Can you explain shortly? Also, I wonder that what will happen when I use output q instead of output reg q ? 回答1: In simulation , a Verilog wire behaves like a piece of metal, a track, a wire, whilst a Verilog reg is a variable, it is storage*.

问题 I inadvertently typed time.clock<() with the Python 2.7 interpreter response being: True . The following code exemplifies the behavior: >>> repr(time.clock) '<built-in function clock>' >>> time.clock<() True Moreover: >>> import sys >>> sys.maxint < () True >>> map(lambda _:0<_,((),[],{})) [True, True, True] In contrast: >>> 1<set(()) TypeError: can only compare to a set Question: Besides why, is there a practical meaning or purpose of an empty list , tuple or dict evaluating as if were

问题 I'm working in this school project. I have two std_logic_vector (31 downto 0) A and B, and I have a variable type std_logic_vector (32 downto 0) and I want to add A+B and put the result in my std_logic_vector with 32 bits. This is my design: library IEEE; use IEEE.STD_LOGIC_1164.ALL; USE ieee.numeric_std.ALL; use ieee.std_logic_arith.all; entity Ej3 is Port ( A : in STD_LOGIC_VECTOR (31 downto 0); B : in STD_LOGIC_VECTOR (31 downto 0); S : out STD_LOGIC_VECTOR (31 downto 0); AluOp : in STD

问题 I'm working in this school project. I have two std_logic_vector (31 downto 0) A and B, and I have a variable type std_logic_vector (32 downto 0) and I want to add A+B and put the result in my std_logic_vector with 32 bits. This is my design: library IEEE; use IEEE.STD_LOGIC_1164.ALL; USE ieee.numeric_std.ALL; use ieee.std_logic_arith.all; entity Ej3 is Port ( A : in STD_LOGIC_VECTOR (31 downto 0); B : in STD_LOGIC_VECTOR (31 downto 0); S : out STD_LOGIC_VECTOR (31 downto 0); AluOp : in STD

问题 I am looking for a way to expand a logical expression (in a string) of the form: '(A or B) and ((C and D) or E)' in Python to produce a list of all positive sets, i.e. ['A and C and D', 'A and E', 'B and C and D', 'B and E'] but I have been unable to find how to do this. I have investigated pyparser, but I cannot work out which example is relevant in this case. This may be very easy with some sort of logic manipulation but I do not know any formal logic. Any help, or a reference to a resource

问题 I'm working on a program that looks at whether or not a particular word is an anagram using std:count however, I don't think my function logic is correct and I cannot seem to figure it out. Assume there are the following words in the file: Evil Vile Veil Live My code is as follows: #include <iostream> #include <vector> #include <fstream> #include <map> using namespace std; struct Compare { std::string str; Compare(const std::string& str) : str(str) {} }; bool operator==(const std::pair<int,

问题 In the source table, there are two columns as following snapshot shows: Then for destination table, it should be something like this: ( "DimLocationKey" is auto-generated surrogate key ) How could I achieve self-referencing effect in SSIS? I tried following approach but it's not working because there would be no matches in the lookup. 回答1: If the column is nullable, then you could load the unique values for location_ID and then have a secondary process come back through and take care of

问题 I am currently doing some theoretical research in LTL (Linear-time Temporal Logic) and CTL (Computation Tree Logic). I am new to NuSMV and I have difficulty to create a simple Kripke structure. My structure is M = (S, R, L) where S = {s0, s1, s2} is the set of possible states, R is a transition relation such that: s0 -> s1, s0 -> s2, s1 -> s0, s1 -> s2, and s2 -> s2, and L is the labeling function for each state defined by: L(s0) = {p, q}, L(s1) = {q, r}, and L(s2) = {r}. I am using notations

问题 Are there any short-circuit logic operators (specifically short-circuit AND and short-circuit OR ) that I can use in a WHERE clause in MySQL 5.5? If there isn't, what are the alternatives? An abstract view at my problem along with an explanation as to why I need this can be found at this fiddle: http://sqlfiddle.com/#!2/97fd1/3 In reality we are looking at millions of books in millions of bookstores in thousands of cities in hundreds of countries, which is why we cannot accept the overhead of

问题 I wrote a function to compare file versions between what a client currently has and the latest version of the file on a server. The client passes the "quad" (Major.Minor.Build.Private) version number as a string to the server, and then the server uses FileVersionInfo: // clientFileVersion will be in "quad" format, a la "3.1.4.1" private bool ServerFileIsNewer(string clientFileVersion, FileVersionInfo serverFile) { // Don't say I never learned nuthin' from Steve McConnell const int MAJOR_INDEX