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  2. Java syntax - Wikipedia

    en.wikipedia.org/wiki/Java_syntax

    java.lang.Float: floating point number ±1.401298E−45 through ±3.402823E+38 32-bit (4-byte) 0.0f [4] double: java.lang.Double: floating point number ±4.94065645841246E−324 through ±1.79769313486232E+308 64-bit (8-byte) 0.0: boolean: java.lang.Boolean: Boolean true or false: 1-bit (1-bit) false: char: java.lang.Character: UTF-16 code unit ...

  3. Fletcher's checksum - Wikipedia

    en.wikipedia.org/wiki/Fletcher's_checksum

    Usually, the second sum will be multiplied by 256 and added to the simple checksum, effectively stacking the sums side-by-side in a 16-bit word with the simple checksum at the least significant end. This algorithm is then called the Fletcher-16 checksum. The use of the modulus 2 8 − 1 = 255 is also generally implied.

  4. Binary-coded decimal - Wikipedia

    en.wikipedia.org/wiki/Binary-coded_decimal

    Thus the letter A, which is (12,1) in the punched card format, is encoded (B,A,1). The currency symbol $, (11,8,3) in the punched card, was encoded in memory as (B,8,2,1). This allows the circuitry to convert between the punched card format and the internal storage format to be very simple with only a few special cases.

  5. Decibel - Wikipedia

    en.wikipedia.org/wiki/Decibel

    The decibel originates from methods used to quantify signal loss in telegraph and telephone circuits. Until the mid-1920s, the unit for loss was miles of standard cable (MSC). 1 MSC corresponded to the loss of power over one mile (approximately 1.6 km) of standard telephone cable at a frequency of 5000 radians per second (795.8 Hz), and matched closely the smallest attenuation detectable to a ...

  6. Speed of light - Wikipedia

    en.wikipedia.org/wiki/Speed_of_Light

    For example, for visible light, the refractive index of glass is typically around 1.5, meaning that light in glass travels at ⁠ c / 1.5 ⁠ ≈ 200 000 km/s (124 000 mi/s); the refractive index of air for visible light is about 1.0003, so the speed of light in air is about 90 km/s (56 mi/s) slower than c.

  7. Currency - Wikipedia

    en.wikipedia.org/wiki/Currency

    A currency [a] is a standardization of money in any form, in use or circulation as a medium of exchange, for example banknotes and coins. [1] [2] A more general definition is that a currency is a system of money in common use within a specific environment over time, especially for people in a nation state. [3]

  8. Photometry (optics) - Wikipedia

    en.wikipedia.org/wiki/Photometry_(optics)

    W⋅sr −1 ⋅m −2 ⋅Hz −1: M⋅T −2: Radiance of a surface per unit frequency or wavelength. The latter is commonly measured in W⋅sr −1 ⋅m −2 ⋅nm −1. This is a directional quantity. This is sometimes also confusingly called "spectral intensity". L e,Ω,λ [nb 7] watt per steradian per square metre, per metre W⋅sr −1 ⋅ ...

  9. Dutch East Indies - Wikipedia

    en.wikipedia.org/wiki/Dutch_East_Indies

    Much of Java became a Dutch plantation and revenue rose continually through the 19th century, which was reinvested into the Netherlands to save it from bankruptcy. [ 29 ] [ 114 ] Between 1830 and 1870, 840 million guilder (€8 billion in 2018 [ 115 ] ) were taken from the East Indies, on average making a third of the annual Dutch government ...