Unit 4 #3

A student has a data file containing 10,000 numerical values. The student is writing a program to compute the average of the numbers contained in the file. Which of the following procedures is most likely to be useful in the student’s program?

• A procedure that returns the quotient when dividing one value by another

• A procedure that returns the sum when adding one value to another

• A procedure that returns the sum of the values in the file

• A procedure that returns true if the file contains any duplicate values and returns false otherwise

Which of the following procedures would be most useful as part of a program to determine whether a word appears in two different text files?

• A procedure getWords, which takes a positive integer n and a text file as input and returns the first n words in the text file.

• A procedure isFound, which takes a word and a text file as input and returns true if the word appears in the text file

• A procedure textMatch, which takes two text files as input and returns true if the two text files are identical.

• A procedure sameSize, which takes two text files as input and returns true if the two text files contain the same number of words.

A school library allows students to borrow laptops. A computer program is used to count the number of times a particular laptop has been borrowed from the library  and the number of times the same laptop has been returned to the library . Which of the following indicate that a particular laptop is not currently borrowed?

Select two answers.

• The difference between borrows and

  returns is zero.

• The product of borrows and returns is a positive even number.

• The quotient when borrows is divided by returns is greater than 1.

• The sum of borrows and returns is a positive even number.

An application program interface (API) provides a procedure Max, which returns the greater of its two integer arguments.

A programmer would like to find the greatest of three integer values , , and . Which of the following expressions will produce the desired result in every case?

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A programmer notices the following two procedures in a library. The procedures do similar, but not identical, things.

• Procedure Square (n) returns the value n^2.

• Procedure Cube (n) returns the value n^3.

Which of the following procedures is a generalization of the procedures described above?

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The following procedure is intended to return true if the list of numbers myList contains only positive numbers and is intended to return false otherwise. The procedure does not work as intended.

PROCEDURE allPositive(myList)

{

index ← 1

len ← LENGTH(myList)

REPEAT len TIMES

{

IF(myList[index] > 0)

{

RETURN(true)

}

index ← index + 1

}

RETURN(false)

}

For which of the following contents of myList does the procedure NOT return the intended result?

• [-3, -2, -1]

• [-2, -1, 0]

• [-1, 0, 1]

• [1, 2, 3]

A programmer notices the following two procedures in a library. The procedures do similar, but not identical, things.

• Procedure MaxTwo (x, y) returns the greater of its two integer parameters.

• Procedure MaxThree (x, y, z) returns the greatest of its three integer parameters.

Which of the following procedures is a generalization of the MaxTwo and MaxThree procedures?

• Procedure Min (x, y), which returns the lesser of its two integer parameters

• Procedure Max (numList), which returns the maximum value in the list of integers numList

• Procedure MaxFour (w, x, y, z), which returns the greatest of its four integer parameters

• Procedure OverMax (numList, max), which returns the number of integers in numList that exceed the integer value max

Consider the following procedures.

PROCEDURE proc1(str)

{

DISPLAY(str)

DISPLAY("happy")

}

PROCEDURE proc2(str1, str2)

{

proc1(str2)

DISPLAY(str1)

}

What is displayed as a result of the procedure call proc2("birthday", "to you") ?

• birthday happy to you

• birthday happy birthday

• to you birthday happy

• to you happy birthday

The procedure  is intended to return the least value in the list . The procedure does not work as intended.

For which of the following values of theList will Smallest (theList) NOT return the intended value?

Select two answers.

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A student is writing a program that is intended to replace each negative value in a particular column of a spreadsheet with the value 0. Which of the following procedures is most likely to be useful in the student’s program?

• A procedure containsNegatives, which returns true if any negative values appear in the column and returns false otherwise.

• A procedure countNegatives, which returns the number of negative values that appear in the column.

• A procedure findNegative, which returns the row number of the first negative value that appears in the column or -1 if there are no negative values.

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  A procedure minimum, which returns the minimum value that appears in the column.