In general, a normal type of programming language that does not enter the variables that must be explicit. Peolyi loose entered the language. All types of data as a parameter can be a lockdown, based on the interpretation and use Perl's Place:

$myVariable = 25;

$myVariable = "A String.";

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C is not a loosely typed language (see strongly typed).

You must declare the variable type before using it:

int myVariable;

myVariable = 25;