numbers as strings

["Jon Aston" <jonraston@xxxxxxxxxxx>]

how do I set a number as a string
example

let us say
$a = 1;
$b = 2;
$c = 0;

I would like to be able to
$str = $c.$a.$b;

to result with
$str = 012;

is there something that I have missed or I guess the question should be what
did I miss

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