First program in C++ || hello world in C++
Our program's first line is a comment line. Every line that begins with two slash signs (//) is regarded as a comment and has no influence on the program's behavior or conclusion. (Words between /* and */ are also treated as comments (old-style comments). Use comments to clarify challenging aspects of your scripts, but don't go overboard. It is also customary to begin each program with a quick overview of what the program will perform.
In the below program we are not using (using namespace std;)
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// C++ program to display "Hello World" // Header file for input output functions #include <iostream.h> #include <conio.h> // Main() function: where the execution of // program begins void main() { // Prints hello world cout<<”Hello world”; getch(); } |
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Output:- Hello world |
<iostream.h>
The
header file <iostream.h> is input output stream, it is use to control the
input output operation in C++ language.
<conio.h>
Another
header file <conio.h> is console input output, it is used in an old DOS
compilers to create text user interfaces.
Void main()
Void: is a
keyword in c++ language, void means nothing, whenever we use void as a function
return type then that function nothing return. here main() function no return
value.
There must
be a main() function in every program. The execution of all C++ programs begins
at the main function. There are two circular brackets after the word main. This
is due to the fact that it is a function declaration (a subsequent blog will go
into more depth about functions). Within the round brackets, you can
encapsulate a list of parameters.
{}
The
beginning and end of the function main are denoted by the two curly brackets
(one at the beginning and one at the end). Also known as the function's body.
When the function is called and performed, it executes everything that is
written between these curly brackets.
cout << “Hello World”;
In C++, the
standard output stream is represented by cout.
(There is
also a standard input stream Read more). A series of characters (Hello World)
will be sent to the standard output stream (in most situations, your screen).
The words
Hello World must be placed between " ", however the " "
will not be printed on the screen. They indicate where the sentence begins and
where it will stop.
getch();
It
is a function that use to hold the output screen until the user passes a key
from the keyboard to exit the screen.