Quick Answer: How Can I Print Hello Without Main Function?

Does C++ need Main?

It’s true that all C++ programs need a main function, but consider the following program.

It defines a new type of variable whose constructor prints something out.

An object of this type is created outside of an empty main function..

What is meant by preprocessor?

In computer science, a preprocessor is a program that processes its input data to produce output that is used as input to another program. … A common example from computer programming is the processing performed on source code before the next step of compilation.

Can we run a program without main function?

So actually C program can never run without a main() . We are just disguising the main() with the preprocessor, but actually there exists a hidden main function in the program.

How can I print welcome message before 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.

Can we use out Println in Java?

println() is used to print an argument that is passed to it. The statement can be broken into 3 parts which can be understood separately as: System: It is a final class defined in the java.

What is printf return?

The printf() function is used for printing the output. It returns the number of characters that are printed. If there is some error then it returns a negative value.

Why semicolon is used in C?

In computer programming, the semicolon is often used to separate multiple statements (for example, in Perl, Pascal, PL/I, and SQL; see Pascal: Semicolons as statement separators). In other languages, semicolons are called terminators and are required after every statement (such as in Java, and the C family).

How can I print hello without main method?

Java Program to Print any Statement Without Using the Main Methodpublic class Without_Main.System. out. println(“Hello World!!”);System. exit(0);//Does not work with JDK7.

How do I print without system out Println?

Java example program to print message without using System. out. println()System.out.write(“www.instanceofjava.com \n”.getBytes());System.out.format(“%s”, “www.instanceofjava.com \n”)PrintStream myout = new PrintStream(new FileOutputStream(FileDescriptor.out)); … System.err.print(“This is custom error message”);More items…•

How can I write C program without main?

C Program without main() function#include#define start main.void start() {printf(“Hello”);}

What is main () in C?

Every C program has a primary (main) function that must be named main. … The main function serves as the starting point for program execution. It usually controls program execution by directing the calls to other functions in the program.

Why is main function special in C++?

The main function is special because it is entry point for program execution. It plays the role of door in a house. … Similarly, main function is important and compulsory as execution starts from here.

What is the starting point of C++ program?

From C++ standard docs 3.6. 1 Main Function, A program shall contain a global function called main, which is the designated start of the program. It is implementation-defined whether a program in a freestanding environment is required to define a main function.

How can you print Hello world without using semicolon?

Let’s see a simple c example to print “hello world” using if statement and without using semicolon.#includeint main(){if(printf(“hello world”)){}return 0;}

How do I compile a C++ program without main function?

You can write any C program without the main() function. … But in reality, _start() is the first function that gets called. … The _start() function sets up the environment to run your program. … To write a C program without main(), just write your own _start() implementation.Compile it as gcc -o no_main no_main.

What is print () in Java?

print(): print() method in Java is used to display a text on the console. This text is passed as the parameter to this method in the form of String. This method prints the text on the console and the cursor remains at the end of the text at the console.

How do I use system out Println?

The following example, the println() method display the string in two separate lines.class Demo.{public static void main(String args[]){System.out.println(“Hello!” );System.out.println(“Java”);}}

Can a program run without main in C++?

No you cannot unless you are writing a program in a freestanding environment (embedded environment OS kernel etc.) where the starting point need not be main() . As per the C++ standard main() is the starting point of any program in a hosted environment .