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Exam 4: Control Structures I Selection

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Question 21

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

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Question 22

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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;.

A) 2
B) 3
C) 4
D) 6

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Question 23

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The conditional operator ?: takes ____ arguments.

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

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 "____________________".

A compound statement functions as if it was a single statement.

If the expression in an assert statement evaluates to true, the program terminates.

The ____________________ of relational and logical operators is said to be from left to right.

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

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.

Which of the following expressions correctly determines that x is greater than 10 and less than 20?

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

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

Suppose that x is an int variable. Which of the following expressions always evaluates to true?

The expression in an if statement is sometimes called a(n) ____.

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

The value of the expression 6 < 5 || 'g' > 'a' && 7 < 4 is ____________________.

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

Once an input stream enters a(n) ____________________ state, all subsequent input statements associated with that input stream are ignored, and the computer continues to execute the program, which produces erroneous results.

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