Ceiling fan be used to reduce the stratification of warm air in a room by forcing it down to affect both occupants' sensations and thermostat readings, thereby improving climate control energy efficiency. Punkah-type ceiling fans date back to 500 BC, and are native to India. Unlike modern rotary fans, these punkah fans move air by moving to and fro, and were operated manually by cord. The first rotary ceiling fans appeared in the early 1860s and 1870s in the United States. At that time, they were not powered by any form of electric motor. Instead, a stream of running water was used,
Primitive data type may be either signed (allowing negative values) or unsigned (non-negative integers only). Common ranges are: Literals for integers can be written as regular Arabic numerals, consisting of a sequence of digits and with negation indicated by a minus sign before the value. However, most programming languages disallow use of commas for or spaces digit grouping. Examples of integer literals are: There are several alternate methods for writing integer literals in many programming languages: A boolean type, typically denoted "bool" or "boolean", is typically a "logical type" that can be either "true" or "false". Although only one bit is necessary to