Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
C++ "Hello, World!" Program
C++ is a general purpose programming language that supports procedural, object-oriented and generic programming. C++ is a superset of C and all valid C programs are valid in C++ as well.
C++ supports object oriented programming with features such as data hiding, encapsulation, inheritance, polymorphism etc.
Let us see the first C++ program that prints Hello, World!.
Example
#include <iostream>
using namespace std;
int main() {
cout << "Hello, World!" << endl; // This prints Hello, World!
return 0;
}The output of the above program is as follows −
Output
Hello, World!
The different parts of the above program are explained as follows.
Headers
There are different headers in C++, each of which contain information that is necessary in the program. The header is used in this program which provides basic input and output services for C++ programs.
Namespaces
Namespaces are a relatively recent addition to C++. The following line we saw above informs the compiler to use the std namespace −
using namespace std;
main()
The program execution begins with the following line as the main() function is the entry point of any C++ program.
int main()
Output
The message “Hello, World!” is displayed on the screen using the following statement −
cout << "Hello, World!" << endl;
Here, cout is an object of the class ostream and is associated with the standard C output stream stdout.
Comments
Single line comments in C++ begin with //. They are used to make the program easier to understand and are ignored by the compiler. The following comment in the above program is to clarify the purpose of the cout statement to the programmers.
// This prints Hello, World!
return
The termination of the main() function is signalled by the return(0); statement. After this, the value 0 is returned to the calling process.
13K+ Views
