irrational numbers: pi
even parity system: the sender counts the number of 1's in the bit pattern, if there is an even number of 1's then a 0 is added. if there is an odd number of 1's a 1 is added. the receiver then checks if there is an even amount.
absolute error = 6.9-.6.875 = 0.025
relative error = 0.025 / 6.9 = 0.00623
integer: only have whole numbers
telephone number: string, has a leading 0
relational operator: if num < num2 then
concatenation: &
assignment statement: num = console.readline()
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