methods

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 6 years ago . Improve this question As a beginner I wonder why my caller.VelocityC only works when put inside of the main block? When i have my code like this, I can't call the method. Method calling class: public class Velocity2 { VelocityCounter caller = new VelocityCounter(); caller

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 6 years ago . Improve this question As a beginner I wonder why my caller.VelocityC only works when put inside of the main block? When i have my code like this, I can't call the method. Method calling class: public class Velocity2 { VelocityCounter caller = new VelocityCounter(); caller

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 6 years ago . Improve this question As a beginner I wonder why my caller.VelocityC only works when put inside of the main block? When i have my code like this, I can't call the method. Method calling class: public class Velocity2 { VelocityCounter caller = new VelocityCounter(); caller

问题 Below is the code am trying the figure out, when arrays (bill, tipValue, totalAmmount) are declared within the object method i get "cannot set property '0' undefined error. But, When the same arrays are declared outside the object then i get expected result" code am getting exception: var john = { bill: [124, 48, 268, 180, 42], tipValue: [], totalAmmount: [], calcTip() { this.bill.forEach(function (ele, i) { this.tipValue[i] = innercalc(ele); this.totalAmmount[i] = this.tipValue[i] + ele; });

问题 I have a class like this: class A { protected: int t = 10; public: void f() { struct B { void g() { print(t); //using t } }; B b; b.g(); } }; ERROR: a nonstatic member reference must be relative to a specific object I see, members of class A is not visible in struct B (which is inside class A method). But how I may capture they, or make friends A and B? (If it's possible) 回答1: Defining B inside a method of A does not make instances of A contain a B . No matter where you define a class, you

问题 i have the ebook for describe runge-kutta method, and its say i need module printSoln def printSoln(X,Y,freq): def printHead(n): print("\n x ",end=" ") for i in range (n): print(" y[",i,"] ",end=" ") print() def printLine(x,y,n): print("{:13.4e}".format(x),end=" ") for i in range (n): print("{:13.4e}".format(y[i]),end=" ") print() m = len(Y) try: n = len(Y[0]) except TypeError: n = 1 if freq == 0: freq = m printHead(n) for i in range(0,m,freq): printLine(X[i],Y[i],n) if i != m - 1: printLine

问题 Ok, this is a very basic question. What is the true reason why I can use the this pointer in c++ methods / member functions? In other words: when I have class foo { void bar(); } Why can I use void foo::bar() { this->... } I can imagine two possibilities: Is it some sort of automatically created member variable It is passed to each method as parameter (and thus each method is automatically extended by that parameter) 回答1: As pointed out by several others, the this keyword is often implemented

问题 I had expected that the Java Virtual Machine would use a simple lookup table for normal method invocations: The object contains a pointer to a lookup table with the addresses for all methods that the class implements (including the methods implemented by super-classes). A specific method is simply represented by an index into that table. The JVM looks up the address of the method in the table, and jumps to that address. But the JVM specification specifies a long and complex procedure for

问题 I'm trying to import a method from a python module but getting it's throwing an error mentioned below. cannot import name 'methodname' from 'modulename' my directory structure: there are solutions to this problem but those are already satisfied in my case. Below is how I tried to import the method from the module. from text_preprocessing import TextToTensor, clean_text here TextToTensor is aclass name and clean_text is a method in TextToTensor class. of Course, I can create an instance of

问题 I have an object called "operator" in C# with a method that takes two number inputs from a user and adds them together. However, I want to make the second parameter (2nd input) optional so that the default is "4" if the user doesn't enter a second number. I know something's wrong because it just ends the program rather than using the default if the user enters just one number and hits enter when prompted for second input. This solution is probably very obvious but it's eluding me. I'd