Question

The generalised syntax for a real number representation is __________

(a) [digits][.digits][(E|e)[(+|-)]digits]

(b) [digits][+digits][(E|e)[(+|-)]digits]

(c) [digits][(E|e)[(+|-)]digits]

(d) [.digits][digits][(E|e)[(+|-)]digits]

I had been asked this question in class test.

Question is taken from Types, Values and Variables topic in chapter Lexical Structures of JavaScript

Answer 1

Correct option is (a) [digits][.digits][(E|e)[(+|-)]digits]

The explanation is: Floating-point literals may also 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 integer exponent. This notation represents the real number multiplied by 10 to the power of the exponent.