Study the following pseudocode. FUNCTION... | Computer Science (9-1) 0984 | Paper 2 Mock 01 | Algorithms, Programming and Logic

Question 1 Report

Study the following pseudocode.

FUNCTION Absolute(N : INTEGER) RETURNS INTEGER
    IF N < 0 THEN
        RETURN -N
    ELSE
        RETURN N
    ENDIF
ENDFUNCTION

FUNCTION Distance(X1 : INTEGER, Y1 : INTEGER, X2 : INTEGER, Y2 : INTEGER) RETURNS INTEGER
    RETURN Absolute(X1 - X2) + Absolute(Y1 - Y2)
ENDFUNCTION

PROCEDURE FindNearest(TargetX : INTEGER, TargetY : INTEGER)
    DECLARE Points : ARRAY[1:4, 1:2] OF INTEGER
    DECLARE NearestDist : INTEGER
    DECLARE NearestIdx : INTEGER
    DECLARE Dist : INTEGER
    DECLARE i : INTEGER
    
    Points[1,1] ← 3   Points[1,2] ← 7
    Points[2,1] ← 1   Points[2,2] ← 2
    Points[3,1] ← 8   Points[3,2] ← 4
    Points[4,1] ← 5   Points[4,2] ← 6
    
    NearestDist ← Distance(TargetX, TargetY, Points[1,1], Points[1,2])
    NearestIdx ← 1
    
    FOR i ← 2 TO 4
        Dist ← Distance(TargetX, TargetY, Points[i,1], Points[i,2])
        IF Dist < NearestDist THEN
            NearestDist ← Dist
            NearestIdx ← i
        ENDIF
    NEXT i
    
    OUTPUT "Nearest point: (", Points[NearestIdx,1], ",", Points[NearestIdx,2], ") at distance ", NearestDist
ENDPROCEDURE

CALL FindNearest(4, 5)

(a) State the value of Absolute(-7). [1]

Answer

Answer Details

(a) Absolute(-7) returns 7. [1]

The function checks if N < 0. Since -7 < 0 is TRUE, it returns -(-7) = 7. The Absolute function strips the sign from a negative number, returning its magnitude.

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Study the following pseudocode. FUNCTION Absolute(N : INTEGER) RETURNS INTEGER IF N < 0 THEN RETURN -N ELSE RETURN N ENDIF ENDFU...

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Study the following pseudocode. FUNCTION Absolute(N : INTEGER) RETURNS INTEGER IF N < 0 THEN RETURN -N ELSE RETURN N ENDIF ENDFU...

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