1e5

1e5 is a numeric literal used in scientific notation to denote 1 times 10 to the power of 5, which equals 100,000. In this form, the letter e (or E) indicates the exponent rather than Euler's number, and the value can be written as 1 × 10^5 in mathematical notation.

In programming and data formats, 1e5 is commonly used to express large or small numbers concisely. In many languages, it represents a floating-point value. For example, in Python, 1e5 evaluates to 100000.0 (a float). In C, C++, and Java, the literal 1e5 is typically a double; 1e5f or 1e5L can specify a float or long double, respectively. JavaScript uses IEEE 754 double-precision numbers, so 1e5 is treated as a numeric value 100000. The exact type and semantics can vary by language, but the numeric value is the same.

The number 100000 is well within the exact representable range of IEEE 754 double precision (it is less than 2^53), so 1e5 can be represented exactly in such formats. This makes it reliable for precise integer values when used as a floating-point literal in computations.

In other contexts, 1e5 may appear in JSON, spreadsheets, or scientific documents as a compact form of 100000. It is widely used for readability in scientific and engineering notation, and it is often preferred when dealing with data that spans several orders of magnitude.