0e0

0e0 is a decimal floating-point literal used in many programming languages to express a number in scientific notation. It denotes zero multiplied by ten to the zero power, which equals 0.

In decimal scientific notation, numbers are written as mantissa times ten raised to an exponent. When the mantissa is zero, the overall value is zero regardless of the exponent, so forms such as 0e0, 0e5, or 0e−12 all represent zero.

In practice, most languages parse 0e0 as a floating-point zero. For example, in Python, 0e0 evaluates to 0.0; in JavaScript, Number('0e0') yields 0; in C or C++, double d = 0e0; results in 0.0. Some environments also distinguish a signed zero, so -0e0 could yield −0.0.

Zero as represented by a literal like 0e0 is distinct from nonzero zeros produced by other computations in some contexts; the sign can matter in floating-point arithmetic due to IEEE 754 conventions. In data interchange formats such as JSON, 0e0 is a valid numeric literal that parses to zero.

See also: scientific notation, floating-point arithmetic, IEEE 754, signed zero.