#include is a header file or not.and <upstream>is a preprocesser please explain about it

Question

#include

Answer 1

#include is a preprocessor.
<upstream> is a header file which has some C declaration and macro definition.

Answer 2

PRAJWAL CT cout is basically a function written in <iostream> header file to print something on the console.

The code block is basically an IDE which is used to write and run c++ code.

Answer 3

Hey Prajwal you are not using tags properly
You should choose tags according to your question like the name of programming language or the topic.

Answer 4

Sir what is meant by cout before executing the statements

Answer 5

What is meant by code blocks to valid c++program