Question: Can We Execute A Program Without Main?

Can we write a program without main method in C?

We can write c program without using main() function.

To do so, we need to use #define preprocessor directive.

The C preprocessor is a micro processor that is used by compiler to transform your code before compilation.

It is called micro preprocessor because it allows us to add macros..

Can we override static method?

Can we Override static methods in java? We can declare static methods with the same signature in the subclass, but it is not considered overriding as there won’t be any run-time polymorphism. Hence the answer is ‘No’.

What happens if we do not declare main () as public?

But if you declare main method as private, you would not be able to execute the class as a standalone java program. Any java class that needs to be executed as a standalone file needs to have a main method that is public, static and returns a void.

Why we Cannot override static method?

Overloading is the mechanism of binding the method call with the method body dynamically based on the parameters passed to the method call. Static methods are bonded at compile time using static binding. Therefore, we cannot override static methods in Java.

Does every C file need a main?

You can compile individual files without main , but you cannot link them and of course cannot run them since they are not complete programs. Note that valgrind is not a static analysis tool but a runtime tool, and therefore it is useless on individual translation units not linked into a runnable program.

What is the main method declared as private?

Yes, we can declare the main method as private in Java. It compiles successfully without any errors but at the runtime, it says that the main method is not public.

Can we execute any code even before the main method?

One of the options is to use static function as initializer to static variable. Print the statement inside a static block of code. Static blocks get executed when the class gets loaded into the memory and even before the creation of an object. Hence it will be executed before the main() method.

How C++ program is executed?

There are three steps in executing a c++ program: Compiling, Linking and Running the program. The c++ programs have to be typed in a compiler. All the programs discussed in the book will be compiled on turbo c++ compiler. … statements in the program will be executed one by one.

Can a Java program run without class?

No you cannot make a java program without class! Because without a class you cannot make objects!

Is main method necessary in Java?

Without a main method you application will have no entry point. Yes, it is required for any executable program. If you try to execute a Java class, the JVM will look for a main method to invoke it. … Not all classes need a main , only the one that serve as “entry point” for execution.

Can we execute a program without main () method in C++?

Function main is only default label for address where program will start execution. So technically yes it`s possible, but you have to set name of function that will start execution in your environment. yes it is possible to write a program without main().

Can we override the main method?

No, we cannot override main method of java because a static method cannot be overridden. The static method in java is associated with class whereas the non-static method is associated with an object. … Therefore, it is not possible to override the main method in java.

What is main () Can we write a program without main ()?

The answer is yes. We can write program, that has no main() function. In many places, we have seen that the main() is the entry point of a program execution. Just from the programmers perspective this is true.

What is main () in C?

main() function is the entry point of any C program. It is the point at which execution of program is started. When a C program is executed, the execution control goes directly to the main() function. Every C program have a main() function.

What are the six ways to use this keyword?

What are the 6 ways to use this keyword in Java?this can be used to get the current object.this can be used to invoke current object’s method.this() can be used to invoke current class constructor.this can be passed as a parameter to a method call.this can be passed as a parameter to a constructor.this can be used to return the current object from the method.Apr 23, 2018

Can we have 2 main methods in Java?

The answer is no; there can only one “main” method – where “main” means an entry point you can “run”. You can code overloaded versions as in your example, but they can’t be “run”. There can be more than one main method in a single program. But JVM will always calls String[] argument main() method.

Is String args necessary in Java?

There’s no significant downside in having to include the parameter. The Java runtime system looks specifically for a method with a single String[] type parameter, because it wants to pass the parameters to your main method. If such a method is not present, it informs you through an exception.

Is it necessary to start the execution of a program from the main () in C?

When main calls another function, it passes execution control to the function, so that execution begins at the first statement in the function. … When you want to pass information to the main function, the parameters are traditionally named argc and argv , although the C compiler does not require these names.