declaration

问题 So this is the problem I'm having I need to input these five methods: Temperature – a constructor method. This should set the initial temperature to 100. getTemp – a method to return the current stored value of degrees Celsius convertToF – a method to convert a Celsius temperature to degrees Fahrenheit convertToK – a method to convert a Celsius temperature to degrees Kelvin updateTempC – a method to update the stored temperature in degrees Celsius into this program: import java.util.Scanner;

问题 i have problem in this simple code, I declare a String , and want change it inside onCreate but AFTER onCreate i have "VariableDeclaratorId expected after this token" Error !! And if i put item=222 inside onCreate i get "111null333" when Toast display here is my code public class MainActivity extends Activity { static String item; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Toast.makeText

问题 First of all, sorry for my English. Since GCC totally ignores inline specifiers, it's a little difficult for me to know when a funcion has been marked inline by me or not. What I'm trying to understand is, when you have some redeclarations of a same function (in a same translation unit or in different ones), when or under which circunstances your function is marked inline or not (irrespective of what will the compiler make with your hint). For example: inline void print(); void print(); or:

问题 I am trying to set a variable in a trigger that is the most recent entry in the table. However, PHPMyAdmin notes there is an error at line SET clicked_campaign_id = . I do not see the problem here. CREATE TRIGGER tr_user_action_click AFTER INSERT ON users_click FOR EACH ROW BEGIN DECLARE clicked_campaign_id int SET clicked_campaign_id = (SELECT campaignId FROM users_click WHERE id = (SELECT max(id) FROM users_click)); Update onlineportal.`campaigns` SET `clicks` = `clicks` + 1 WHERE id =

问题 i need something like this const char **nodeNames[] = { {"RootNode", "Reference", "Node_1", "Node_2", "Node_3"}, {"RootNode", "Hips", "Node_1", "Node_2", "Node_3"}, {"RootNode", "Heviest", "Node_1", "Node_2", "Node_3"}, }; but with previous declaration, i got an error. And how can i reference to it in code? 回答1: Looks like you want a two dimensional array of const char* : const char *nodeNames[][5] = { // ^^ this dimension can be deduced by the compiler, the rest not {"RootNode", "Reference",

问题 So this section of the standard gives this example (My questions are inline): template<class T, class U> struct Outer { template<class X, class Y> struct Inner; // Where are X and Y from? Is this defining a struct? template<class Y> struct Inner<T, Y>; // Is this defining a struct specialization? If so what is Y? template<class Y> struct Inner<T, Y> { }; // I feel like this is a redefinition of the line above, could it ever not be? template<class Y> struct Inner<U, Y> { }; }; Admittedly I can

问题 Just started with K & R and on the 2nd chapter, there is the line: Declarations list the variables to be used and state what type they have and perhaps what their initial values are . So: int x = 42 is a definition . and int x is a declaration but also a definition since every definition is a declaration . But when we assign an intial value like K & R say, doesn't that make the declaration a definition ? 回答1: You confuse two things: A declaration states ( declares ) what an object's* type,

问题 What is significant difference between following zero double variable declaration: 0.0 VS 0d double d1 = 0.0; double d2 = 0d; I understand that both these are better than just 0 ,because are more obvious for code reader. However 0.0 VS 0d difference is not clear for me. 回答1: There is no difference. Have a look at the Java Language Specification, section 3.10.2 DecimalFloatingPointLiteral: Digits . Digits opt ExponentPart opt FloatTypeSuffix opt . Digits ExponentPart opt FloatTypeSuffix opt

问题 I'm trying to build a structure in VB to allow me to both store and parse an IP/UDP based message that I'm receiving as ASCII encoded HEX. The trick is that after I get past the IP header and the UDP header the data that follows after is of a variable structure type. By that I mean that there is a basic initial message structure that has data in specific fields... two thirds of which are optional... but then the actual data, the real meat of the transmission, is in one of 15 different message

问题 This question already has answers here : What are the nuances of scope prototypal / prototypical inheritance in AngularJS? (3 answers) Closed 4 years ago . I have a problem when i try to fragment my html with ng-include: This is what my index.html page looks like when it works (prix=price, TVA=tax): <!DOCTYPE html> <html> <head> <meta charset="utf-8" /> <link type="text/css" rel="stylesheet" href="style.css" /> <title> TVA </title> </head> <body> <div> <div ng-app="app" ng-controller="appCtrl