Tutorial tour

Welcome in the guided tour of the tutorial!

All the classes in the tutorial are provided with your SmartEiffel installation, int the tutorial directory.

Easy starting

Hello world... To execute the program, go to the SmartEiffel/tutorial directory and execute the command:

se c hello_world make -o hello

The command produces an executable, usually hello or hello.exe depending on the system. Run it.

This unavoidable program is in hello_world.e and lets you grasp the basic concepts of Eiffel. Those concepts are:

• Everything is a class. In Eiffel, out of classes there is no salvation.
• The program starts by creating an object. Here, the method is the make creation feature in the class HELLO_WORLD.
• Each file is named after the name of the class, lower-case, with the .e extension.
• Note the special object io that allows to write text on the standard output. We will see that it also allows to read data.
• For the Eiffel syntax, look here.

Also to look at:

• fibonacci.e
• knight.e
• pyramide.e and pyramide2.e
• gcd
• hanoi
• parking
• triangle

Some important concepts

Input-output

• io
• directory
• basic_directory?

Arguments

print_arguments.e

Collections

including iterator and sorting

Manifest notations

manifest_notation.e

Downcasting

downcasting.e

To go further

Agents

... and tuples

Memory management

memory

Extension libraries

Vision

visiopn, signal