# Stuyvesant-HS-Intro-CS-Review-Sheet-MKS21

Jun 18th, 2015
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THE “EQUAL” OPERATOR ONLY WORKS FOR NUMERIC COMPARISONS. FOR OTHER PURPOSES, SUCH AS COMPARING TRUTH VALUES, USE “EQUAL?”, EXPLAINED FURTHER BELOW. THERE IS NO “NOT EQUAL” FUNCTION BUILT INTO SCHEME. INSTEAD, USE “(NOT (= A B))”. Logic Connectors • and (both linked clauses must be true for the whole statement to be true) • or (either linked clause can be true for the whole statement to be true) • not (reverse of the truth value of the statement)

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INTRO TO COMPUTER SCIENCE STUDY GUIDE TERM 1by Aaron LooSCHEME/RACKETArithmeticRemember to put the operation FIRSTCorrect: (+ 1 2)Incorrect: (1 + 2)There must be a space between each element, and there may be as many spaces as you please.Correct: (* 2 5)Incorrect: (*2 5)Operations available:+-*/expt (exponent, I.e (expt 2 3) = 2^3)sqrt (square root, I.e (sqrt 4) = 2)modulo (gives you the remainder of two #'s, I.e (modulo 21 2) = the remainder of 21/2)quotient (gives you the quotient rounded down to the nearest whole number of 2 #'s, I.e (quotient 21 2) 10)abs (absolute value, I.e (abs -2) = 2Compound ArithmeticScheme works from inside-out. Therefore:(/ (* 3 5) (+ 2 3)) (/ 15 5) 3Comparison OperationsComparison operators return a true or false valueLike arithmetic operations, the operation is placed at the beginning.I.e: (< 11 20) #t (< 21 20) #fComparison Operators:><=>=<=THE EQUAL OPERATOR ONLY WORKS FOR NUMERIC COMPARISONS. FOR OTHER PURPOSES, SUCH AS COMPARING TRUTH VALUES, USE EQUAL?, EXPLAINED FURTHER BELOW.THERE IS NO NOT EQUAL FUNCTION BUILT INTO SCHEME. INSTEAD, USE (NOT (= A B)).Logic Connectorsand (both linked clauses must be true for the whole statement to be true)or (either linked clause can be true for the whole statement to be true)not (reverse of the truth value of the statement)I.e:(and #t #t) #t(and #t #f) #f(or #f #t) #t(or #f

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