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Exam 4: Control Structures I Selection

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Question 1

Multiple Choice

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What is the output of the following code? char lastInitial = 'S'; switch (lastInitial) { case 'A': Cout amanda "section 1" amandaendl; break; case 'B': cout << "section 2" << endl; break; case 'C': cout << "section 3" << endl; break; case 'D': cout << "section 4" << endl; break; default: cout << "section 5" << endl; }

A) section 2
B) section 3
C) section 4
D) section 5

E) All of the above
F) None of the above

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D

Question 2

Multiple Choice

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Which of the following is a relational operator?

A) =
B) ==
C) !
D) &&

E) A) and B)
F) None of the above

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Question 3

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The operators !, &&, and || are called relational operators.

What is the output of the following C++ code? int x = 35; Int y = 45; Int z; If (x > y) Z = x + y; Else Z = y - x; Cout << x << " " << y << " " << z << endl;

The result of a logical expression cannot be assigned to an int variable, but it can be assigned to a bool variable.

Suppose P and Q are logical expressions. The logical expression P && Q is true if both P and Q are true.

Suppose x is 5 and y is 7. Choose the value of the following expression: (x != 7) && (x <= y)

Which of the following will cause a logical error if you are attempting to compare x to 5?

What is the value of x after the following statements execute? int x; X = (5 <= 3 && 'A' < 'F') ? 3 : 4

What is the output of the following C++ code?

In C++, both ! and != are relational operators.

You can disable assert statements by using which of the following?

Consider the following statements. int score; string grade; if (score >= 65) grade = "pass"; else grade = "fail"; If score is equal to 75, the value of grade is "____________________".

The term ____________________ describes a process in which the computer evaluates a logical expression from left to right and stops as soon as the value of the expression is known.

The expression (x >= 0 && x <= 100) evaluates to false if either x < 0 or x >= 100.

Which of the following operators has the lowest precedence?

You can use either a(n) ____ or a ____ to store the value of a logical expression.

Assume you have three int variables: x = 2, y = 6, and z. Choose the value of z in the following expression: z = (y / x > 0) ? x : y;.

Putting ____________________ in front of a logical expression reverses the value of that logical expression.

A control structure alters the normal sequential flow of execution in a program.