Editing C syntax (section)

====Storing the address of a label====
[[GNU Compiler Collection|GCC]] extends the C language with a unary {{code|&&}} operator that returns the address of a label. This address can be stored in a {{code|void*}} variable type and may be used later in a {{code|goto}} instruction. For example, the following prints {{code|"hi "}} in an infinite loop:

<syntaxhighlight lang=C>
    void *ptr = &&J1;

J1: printf("hi ");
    goto *ptr;
</syntaxhighlight>

This feature can be used to implement a [[jump table]].