Which method can be defined only once in a program

In this article It is possible to split the definition of a Partial Classes There are several situations when splitting a class definition is desirable: • When working on large projects, spreading a class over separate files enables multiple programmers to work on it at the same time. • When working with automatically generated source, code can be added to the class without having to recreate the source file. Visual Studio uses this approach when it creates Windows Forms, Web service wrapper code, and so on. You can create code that uses these classes without having to modify the file created by Visual Studio. • When using To split a class definition, use the public partial class Employee The partial keyword indicates that other parts of the class, struct, or interface can be defined in the namespace. All the parts must use the partial keyword. All the parts must be available at compile time to form the final type. All the parts must have the same accessibility, such as public, private, and so on. If any part is declared abstract, then the whole type is considered abstract. If any part is declared sealed, then the whole type is considered sealed. If any part declares a base type, then the whole type inherits that class. All the parts that specify a base class must agree, but parts that omit a base class still inherit the base type. Parts can specify different base interfaces, and the final type implements all the interfaces listed by all the partial declarations. Any clas...

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Closed 4 years ago. a variable/function can be declared any number of times but it can be defined only once. What does that actually mean?? I tried to understand that statement on online compilers and I was expecting to show error but it didnt. #include int x=10; int main() expected output: i expected to show error because i have defined variable x and assigned three different values 10,20,30. the concept says you can declare variable any number of times but can define only once since two different locations cant be given to the same variable actual output: 30 x = 10; isn’t a definition. It’s an assignment. You can assign as many times as you like. int x; is a definition (and, at the same time, also a declaration). Likewise, extern int x; is a declaration (without a definition). To illustrate the concept you were asking about, the following is valid C: // Duplicate declaration: OK extern int x; extern int x; // Definition: OK int x; // int x; // Duplicate definition: ERROR // Definition with initialisation: OK int y = 42; // (Re)assignment: OK inside function. x = 1; y = 2; For functions, the syntax is different. To declare a function, write its prototype. To define it, add a function body: // Declaration: int f(void); // Also possible, but unnecessary: extern int f(void); // Definition: int f(void)

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JAVA - CLASSES AND METHODS MCQs • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • •

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Answer: b Explanation: Function overloading is a process of defining more than one method in a class with same name differentiated by function signature i:e return type or parameters type and number. Example – int volume(int length, int width) & int volume(int length , int width , int height) can be used to calculate volume. 3. Which of the following is a method having same name as that of it’s class? a) finalize b) delete c) class d) constructor View Answer Answer: a Explanation: main() method can be defined only once in a program. Program execution begins from the main() method by java runtime system. 5. Which of this statement is incorrect? a) All object of a class are allotted memory for the all the variables defined in the class b) If a function is defined public it can be accessed by object of other class by inheritation c) main() method must be made public d) All object of a class are allotted memory for the methods defined in the class View Answer • class box • a) 0 b) 1 c) 6 d) 25 View Answer • class equality • a) false b) true c) 0 d) 1 View Answer • class box • a) 0 b) 1 c) 25 d) 26 View Answer • class Output • a) only sum(10) b) only sum(10,20) c) only sum(10) & sum(10,20) d) all of the mentioned View Answer • class area • a) 0 b) 1 c) 30 d) error View Answer