Introduction

In this post, we will write a small C++ Hello World program and discuss the general structure of a C++ program. In C++ the executable unit is called a function. We will use Code:: Blocks IDE to create a C++ project.

Launch IDE

Launch Code:: Blocks IDE.

Incase Code:: Blocks are not installed on the machine. (https://www.testingdocs.com/download-and-install-codeblocks/)

 

 

Create a Project.

Specify the GNU GCC C++ compiler.
Create a new File.

C++ source file

Click C/C++ source.
Choose C++ language selection.

 

Create a main.cpp and provide the file location.
Check Build and Release build targets.

 

 

C++ Hello World Program.

Let’s write source code for the program.

// Hello World C++ program
#include<iostream>
using namespace std;
int main(){
    cout << "Hello World!" << endl;
return 0;
}

 

The first line is a comment. comments are not translated by the compiler into executable code. They
are used to describe the operation of the program.

The next line uses the iostream library to perform input and output. These are called as pre-processor directives. The include directive instructs the pre-processor to copy the contents of the specified file into the program.

The next line of the program tells the program will be using objects that are named in a region called std. In the C++ program, the function named main() is the first function called when the program is executed.

 

Run the program

Build and Run the program to see the output as shown in the picture.

 

 

It is a convention that a zero result from the main indicates that the program ran successfully without any errors.

 

For more information on Code Blocks IDE, visit the official website of Code blocks IDE:
http://www.codeblocks.org/