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With the -v command of the gcc, you can see all programs invoked by the compiler. Let's try with an example of the -v command:

gcc -v

Result (certainly different on your system):

An easy way to change the keyboard language on Linux is to write this command on your favourite terminal:

setxkbmap lang

Where lang is the language you want. As an example to change the keyboard in french:

setxbmap fr

Or for an american keyboard:

setxbmap us

We can see with examples below that myString[0] == *myString == *(&myString[0]) == H.

Why?

Because myString[0] points the first character of the string "Hello World", in this case "H".

The sizeof() unary operator is often used, so it is important to know some tricks that we can do with it.

It is used to calculate the sizes of datatypes and it takes one argument: the type.

The main purpose of sizeof() is of course to allocate memory in conjuction with malloc.

The free() function is the sister of the malloc() function. As malloc() returns the address of the first byte of the allocated memory, free() accepts, as only parameter, the address of this first byte.

In this tutorial we will see a simple beep function. Let's take an example of the beep function:

The tgetent() function is a Linux system call function. It is designed to be used with other termcap functions such as:

The getenv() function is a Linux system call function.

It is designed to know what is the name of an environment variable.

The main use is for the "TERM" variable. Let's see an example of the getenv() function: