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Level 69

Data Representation


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binary code
2 state system, usually TRUE/FALSE, 1/0, ON/OFF
binary number
a numeric value using base 2 (binary place headings)
binary place headings
128, 64, 32, 16, 8, 4, 2, 1
0-255
range of integer values for 1 byte
256 patterns
number of binary codes for 1 byte
integer
a whole number without any fraction part
real number
a number with fraction part (digits after the point), needs floating point representation)
floating point
method to store real numbers in two parts: mantissa and exponent
mantissa
the digits of a real number value (no point included), part of floating point
exponent
the position of the point for a real number, part of floating point
ascii
64 thousand characters
256 characters
number of letters, symbols represented using ASCII
control character
a non-printing character in ASCII, causes an action, eg deleting a character
character set
the set of letters, symbols represented using ASCII (256 characters)
bitmap
each pixel in an image is coded as a binary value eg white is 0, black is 1
pixel
picture cell, a single dot in an image
resolution
the number of pixels used in an image
dots per inch
the number of pixels used per inch, resolution (dpi)