The double numeric data type can have a decimal point. The traditional syntax is used for real numbers. A real value is represented as the part of the number, followed by a decimal point and the fractional part of the number. This type can store real numbers from -1.7976931348623157E308 to 1.7976931348623157E308.
Floating-point literals can be represented using exponential notation—a real number followed by the letter e (or E), followed by an optional plus (+) or minus (-) sign, followed by an integral exponent, in the following format:
[digits][.digits][{E|e}[{+|-}]digits]
2.718
2345.789
7.748E-5
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