Syntax in C++

C++ Program

#include <iostream>
using namespace std;

int main() {
  cout << "Hello World!";
  return 0;
}

Output

Hello World

#include<iostream>

It is a header file that works with input and output objects, such as cout. It tells the compiler to include the standard iostream file which contains declarations of all the standard input/output library functions.

using namespace std

using namespace std is used to import the std namespace into the current namespace of the program. It means the use of names for objects and variables from the standard library.

int main()

{ and }

The opening braces ‘{‘ shows that starting of the main function and the closing braces ‘}’ shows the ending of the main function. Everything between two braces the body of the main function.

cout<<“Hello World”;

This line displays the message “Hello World” on the screen. A semi-colon ‘;’ is used to end a statement. Everything followed by the character “<<” is displayed to the output device and The cout is a predefined object of ostream class. 

return 0;

Return is also a statement. This statement is used to return a value from a function. It terminates the main( ) function and causes it to return the value 0 to the calling process