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=title Hello World - scalar variables
Strings can be stored in so called scalar variables.
Each such variable starts with a $ sign and then alphanumeric characters, underscore or dash.
Before using such a variable the first time one has to declare it by the my keyword.
Variables are case sensitive.
my $greeting = "Hello World";
my $Gábor-was-born-in = 'Hungary';
By default scalar variables have no specific types but later we will see how
can we restrict the values a scalar can hold to a number or to any other type.
One can also declare a variable without giving it an inital value:
In such case the value of the variable will be Any() which
is just case of being not defined.
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Written by Gabor Szabo