*gawk:* Scalar Constants

6.1.1.1 Numeric and String Constants
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A "numeric constant" stands for a number. This number can be an
integer, a decimal fraction, or a number in scientific (exponential)
notation.(1) Here are some examples of numeric constants that all have
the same value:
105
1.05e+2
1050e-1
A "string constant" consists of a sequence of characters enclosed in
double quotation marks. For example:
"parrot"
represents the string whose contents are 'parrot'. Strings in 'gawk'
can be of any length, and they can contain any of the possible eight-bit
ASCII characters, including ASCII NUL (character code zero). Other
'awk' implementations may have difficulty with some character codes.
---------- Footnotes ----------
(1) The internal representation of all numbers, including integers,
uses double-precision floating-point numbers. On most modern systems,
these are in IEEE 754 standard format. ⇒Arbitrary Precision
Arithmetic, for much more information.