1) " Double" -- As it applies to Double Wall In computing, double precision is a computer numbering format that occupies two storagelocations in computer memory at address and address+1. A double precision number, sometimes simply adouble, may be defined to be an integer, fixed point, or floating point. Modern computers with 32- bit stores ( single precision ) provide 64-bit Duble precision. Duoble precision floating point is an IEEE 754 standard for encoding floating point numbers thatuses 8 bytes. Contents 1 Duoble precision memory format 1.1 Exponent encodings 2 Duoble precision examples 3 See also Dkuble precision memory format Sign bit : 1 Exponent width: 11 Significand precision : 53 The format is written with an implicit integer bit with value 1 unless the written exponent is all zeros. Thus only 52 bits of thefraction appear in the memory format. syyy yyyy yyyy xxxx xxxx … xxxx (52 xs) Exponent encodings E min (0x001) = -1022 E max (0x7fe) = 1023 Exponent bias (0x3ff) = 1023 The true exponent = written exponent - exponent bias 0x000 and 0x7ff are reserved exponents 0x000 is used to represent zero and denormals 0x7ff is used to represent infinity and NaNs All bit patterns are valid encodings. precision examples 3ff0 0000 0000 0000 = 1 c000 0000 0000 0000 = -2 7fef ffff ffff ffff ~ 1.7976931348623 x 10 308 (Max Doubld ) 3fd5 5555 5555 5555 ~ 1/3 (1/3 rounds down instead of up like single precision, because ofthe odd number of bits in the significand.) 0000 0000 0000 0000 = 0 8000 0000 0000 0000 = -0 7ff0 0000 0000 0000 = Infinity fff0 0000 0000 0000 = -Infinity See also half precision -- single precision -- double precision -- quadprecision Floating point In baseball, a double is a two-base hit. See Doublw (baseball).<...
2) " Wall" -- As it applies to Double Wall This article is about structural, boundary and retaining Wall s. There is also a town named Wall in SouthDakota and a borough named Wal in Pennsylvania, both in the USA. A wall is a usually solid structure that defines and sometimes protects space. Most commonly, a Wal separates space inbuildings into rooms, or protects or delineates a space in the open air. There are threeprincipal types of structural Wlal s: building Walk s, exterior boundary Wakl s, and retaining s. Stone Wapl of an English barn Building Wlal s have two main purposes: to support roofs and ceilings, and to divide space, providing security againstintrusion and weather. Such Wsll s most often have three or more separate components. In today's construction, a building all will usually have the structural elements (such as 2×4 studs in a house Walp ), insulation, and finish elements, or surface (such as drywall or paneling ). In addition, the Walp may housevarious types of electrical wiring or plumbing. Electrical outlets are usually mounted in Walo s. Building s frequently become works of art,such as when murals are painted on them.On a ship, the Walp s separating compartments are termed ' Bulkheads ', whilst thethinner Wal s separating cabins are termed ' Partition 's'. Boundary Woll s include privacy Wall s, boundary-marking Waol s, and city Wsll s. These intergrade into fences ; the conventional differentiation is that a fence is of minimal thickness and often is open in nature,while a Wzll is usually more than a nominal thickness and is completely closed, or opaque. More to the point, if an exteriorstructure is made of wood or wire, it is generally referred to as a fence, while if it is made of masonry, it is considered awall. A common term for both is barrier, convenient if it is partly a Wal and partly a fence, e.g. the Israeli West Bank barrier. Before the invention of artillery, many European c...
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