1e5f

1e5f is a numeric literal used in several programming languages to represent a floating-point value written in scientific notation. The notation 1e5 means 1×10^5, and the trailing f indicates that the literal should be treated as a 32-bit single-precision floating-point value (a float) rather than a double.

In languages such as C, C++, Java, and C#, the f suffix designates a float type. For example, 1e5f in C or C++ yields approximately 100000.0f. Without the suffix, 1e5 is treated as a double in those languages. In Java, 1e5f is a valid float literal; 1e5 is a double literal by default.

The numeric value 1e5f equals 100000.0 in decimal. Because 100000 is within the exact representable range for 32-bit floats—integers up to 2^24 can be represented exactly—1e5f is represented exactly as 100000.0f in IEEE 754 single precision. The representation is subject to the usual floating-point limitations when used in arithmetic with other floating-point values.

Common uses include initializing constants in code where readability of large magnitudes is preferred, or when a value must be of type float (not double) for API compatibility or performance reasons. It is also used in testing parsing of scientific notation and in scenarios where a precise decimal interpretation is important.

Caveats include floating-point precision and rounding errors in broader calculations, especially when combining floats and doubles. In critical comparisons, explicit handling or casting may be necessary, and literals like 1e5f should be interpreted within the usual limits of single-precision arithmetic.