You're maybe wondering what are interface and abstract classes? That's a good point.
In this tutorial we're going to see how to compute the area of a shape by declaring an array of undefined shapes.
After this, we will be able to use this shape as an object with this kind of Factory design pattern.
In this awk tutorial we're going to see how to count words in a file and display it.
And in a second time, we will see how to check if a name, inside a file, is present in the first file.
Let's check it.
The awk user command is made to read a file and check each column, one by one.
We need to compute the average of students' marks and to display the total of their average.
Let's go.
We've already played with awk, passing it a file, but we're going now to see how to retrieve data from the user with the command line.
We would like to know what's the name of the user.
Let's ask him.
The user command awk enables to check if an expression could be found in a file.
It's a kind of regex, with classic operators, such as: ? . *.
Let's do it.
With the awk FILENAME builtin variable, we are able to retrieve the name of the file passed as argument during the execution.
It will avoid us to use a regex command line. Sometimes interesting.
Let's see this.
We have a file with customers inside.
We would like to display all the file with line numbers before each line.
Let's see this in this awk tutorial.
Stack and heap enable data management inside the memory.
But some data are added onto the stack and the other into the heap.
For the stack, there is a stack pointer that enables to catch the last data added onto the stack.
In this Java tutorial we are going to see how to display four patterns using the while and for loops.
Notice that this example works in every language as well, just change the print() method depending on yours.
As every language, OOP is a plus. And who says OOP, says classes and methods.
Perl is able to manage such of things. That's what we are going to see in this Perl tutorial.
Let's create classes and their methods.
