ITM 207 Midterm Review Questions and Answers |
2025/26 Update | 100% Correct
Natural Numbers
Zero and any number obtained by repeatedly adding one to it.
Negative Numbers
A value less than 0, with a - sign
Integers
A natural number, a negative number
Rational Numbers
An integer or the quotient of two integers
Byte
The number of bits in a word determines the word length of the computer, which is usually a
multiple of 8
Data compression
Reduction in the amount of space needed to store a piece of data or the bandwidth to transmit it
Compression ratio
The size of the compressed data divided by the size of the original data
lossless
which means the data can be retrieved without any loss of original information
, lossy
which means some information may be lost in the process of compression
Analog Data
A continuous representation, analogous to the actual information it represents
Digital Data
A discrete representation, breaking the information up into separate elements
Signed-magnitude number representation
Used by humans The sign represents the ordering (the negatives come before the positives in
ascending order) The digits represent the magnitude (the distance from zero)
Ten's Compelement
negative(I) = 10^k - I, where k is the number of digits
ASCII
American Standard Code for Information Interchange, uses 7 bits
Extended ASCII
American Standard Code for Information Interchange, uses 8 bits
Unicode
uses 16 bits per character
Keyword Encoding
Replace frequently used patterns of text with a single special character
2025/26 Update | 100% Correct
Natural Numbers
Zero and any number obtained by repeatedly adding one to it.
Negative Numbers
A value less than 0, with a - sign
Integers
A natural number, a negative number
Rational Numbers
An integer or the quotient of two integers
Byte
The number of bits in a word determines the word length of the computer, which is usually a
multiple of 8
Data compression
Reduction in the amount of space needed to store a piece of data or the bandwidth to transmit it
Compression ratio
The size of the compressed data divided by the size of the original data
lossless
which means the data can be retrieved without any loss of original information
, lossy
which means some information may be lost in the process of compression
Analog Data
A continuous representation, analogous to the actual information it represents
Digital Data
A discrete representation, breaking the information up into separate elements
Signed-magnitude number representation
Used by humans The sign represents the ordering (the negatives come before the positives in
ascending order) The digits represent the magnitude (the distance from zero)
Ten's Compelement
negative(I) = 10^k - I, where k is the number of digits
ASCII
American Standard Code for Information Interchange, uses 7 bits
Extended ASCII
American Standard Code for Information Interchange, uses 8 bits
Unicode
uses 16 bits per character
Keyword Encoding
Replace frequently used patterns of text with a single special character
