Ch 4

When an if statement is placed within the conditionally-executed code of another if statement, this is known as a. complexity b. overloading c. nesting d. validation e. None of these

C

This operator represents the logical AND: a. ++ b. || c. && d. @ e. None of these

C

Input values should always be checked for a. an appropriate range b. reasonableness c. division by zero, if division is taking place d. All of these e. None of these

D

What is assigned to the variable result given the statement below with the following assumptions: x = 10, y = 7, and x, result, and y are all int variables. result = x >= y; a. 10 b. 7 c. x >= y d. 1 e. 0

D

What is the output of the following code segment? int x = 5; if (x = 2) cout << "This is true!" << endl; else cout << "This is false!" << endl; cout << "That's all, folks!" << endl; a. This is true! b. This is false! c. This is false! That's all, folks d. This is true! That's all folks e. This is true! This is false! That's all, folks!

D

What is the output of the following code? int w = 98; int x = 99; int y = 0; int z = 1; if (x >= 99) { if (x < 99) cout << y << endl; else cout << z << endl; } else { if (x == 99) cout << x << endl; else cout << w << endl; } a. 98 b. 99 c. 0 d. 1 e. None of these

D

What will be displayed after the following statements execute? int funny = 7, serious = 15; funny = serious % 2; if (funny != 1) { funny = 0; serious = 0; } else if (funny == 2) { funny = 10; serious = 10; } else { funny = 1; serious = 1; } cout << funny << " " << serious << endl; a. 7 15 b. 0 0 c. 10 10 d. 1 1 e. None of these

D

Without this statement appearing in a switch construct, the program "falls through" all of the statements below the one with the matching case expression. a. break b. exit c. switch d. scope e. None of these

A

These operators connect two or more relational expressions into one, or reverse the logic of an expression. a. relational b. logical c. irrational d. negation e. None of these

B

What is the output of the following code segment if the user enters 23? int number; cout << "Enter a number: "; cin >> number; if (number > 0) cout << "Hi, there!" << endl; else cout << "Good-bye." << endl; a. Hi, there! Good-bye. b. Hi, there! c. Good-bye. d. "Hi, there!" e. nothing will output

B

Relational operators allow you to __________ numbers. a. add b. multiply c. compare d. average e. None of these

C

The conditional operator takes two operands.

F

An expression that has any value other than 0 is considered true by an if statement.

T

After the following code executes, what is the value of my_value if the user enters 0? cin >> my_value; if (my_value > 5) my_value = my_value + 5; else if (my_value > 2) my_value = my_value + 10; else my_value = my_value + 15; a. 15 b. 10 c. 25 d. 0 e. 5

A

Given the if/else statement: if (a < 5) b = 12; else d = 30; Which of the following performs the same operation? a. a < 5 ? b = 12 : d = 30; b. b < 5 ? b = 12 : d = 30; c. a >= 5 ? d = 30 : b = 12; d. d = 30 ? b = 12 : a = 5; e. None of these

A

The __________ is an equality (or comparison) operator. a. == b. >= c. != d. = e. None of these

A

This statement uses the value of a variable or expression to determine where the program will branch to. a. switch b. select c. association d. scope e. None of these

A

What is the value of donuts after the following statement executes? int donuts = 10; if (donuts != 10) donuts = 0; else donuts += 2; a. 12 b. 10 c. 0 d. 1 e. None of these

A

What is the value of the following expression? true && !false a. true b. false c. -1 d. +1 e. None of these

A

What is the value of the following expression? true && true a. true b. false c. -1 d. +1 e. None of these

A

When a program lets the user know that an invalid choice has been made, this is known as: a. input validation b. output correction c. compiler criticism d. output validation e. None of these

A

Given that x = 2, y = 1, z = 0, what will the following cout statement display? cout << "answer = " << (x || !y && z) << endl; a. answer = 0 b. answer = 1 c. answer = 2 d. None of these

B

The default section of a switch statement performs a similar task similar to the __________ portion of an if/else if statement. a. conditional b. break c. trailing else d. All of these e. None of these

C

Select all that apply. Given: x = 5, y = 6, z = 8. Which of the following are false? 1. x == 5; 2. x < (y + 2); 3. z <= 4; 4. y > (z-x); 5. z >= (y+x) 6. y <= 6 a. 1 b. 2 c. 3 d. 4 e. 5 f. 6

C,E

A variable, usually a bool or an int, that signals when a condition exists is known as a(n) a. relational operator b. arithmetic operator c. logical operator d. flag e. None of these

D

This operator represents the logical OR: a. -- b. || c. && d. # e. None of these

B

Which line in the following program will cause a compiler error? 1 #include <iostream> 2 using namespace std; 3 int main() 4 { 5 int number = 5; 6 if (number >= 0 && <= 100) 7 cout << "passed.\n"; 8 else 9 cout << "failed.\n"; 10 return 0; 11 } a. line 3 b. line 6 c. line 7 d. line 9 e. None will cause an error

B

Which statement allows you to properly check the char variable code to determine whether it is equal to a C and then output This is a check? a. if code is equal to C cout << "This is a check\n"; b. if (code = "C") cout << "This is a check\n"; c. if (code == 'C') cout << "This is a check\n"; d. if (code == C) cout << "This is a check" << endl;

C

Given the following code segment, what is the output? int x = 1, y = 1, z = 1; y = y + z; x = x + y; cout << "result = " << (x < y ? y : x) << endl; a. result = 0 b. result = 1 c. result = 2 d. result = 3 e. there will be no output

D

Which of the following expressions will determine whether x is less than or equal to y? a. x > y b. x =< y c. x >= y d. x <= y e. x == y and x < y

D

Which of the following is evaluated first, given the expression: A && B || C && !D a. A && B b. B || C c. C && !D d. !D

D

The default section is required in a switch statement.

F

This operator takes an operand and reverses its truth or falsehood: a. !& b. || c. =! d. ! e. None of these

D

If you intend to place a block of statements within an if statement, you must place __________ around the block: a. parentheses ( ) b. square brackets [ ] c. angle brackets < > d. curly braces { } e. None of these

D

The following code correctly determines whether x contains a value in the range of 0 through 100, inclusive. if (x > 0 && <= 100)

F

The value of result in the following expression will be 0 if x has the value of 12. result = x > 100 ? 0 : 1;

F

If you place a semicolon after the statement: if (x < y) a. the code will not compile b. the compiler will interpret the semicolon as a null statement c. the if statement will always evaluate to false d. All of these are true e. None of these

B

What is the output of the following segment of code if the value 4 is input by the user? int num; int total = 0; cout << "Enter a number from 1 to 10: "; cin >> num; switch (num) { case 1: case 2: total = 5; case 3: total = 10; case 4: total = total + 3; case 8: total = total + 6; default: total = total + 4; } cout << total << endl; a. 0 b. 3 c. 13 d. 23 e. None of these

C

What is the value of donuts after the following statement executes? int donuts = 10; if (donuts = 1) donuts = 0; else donuts += 2; a. 12 b. 10 c. 0 d. 1 e. None of these

C

What is the value of result after the following code executes? int a = 60; int b = 15; int result = 10; if (a = b) result *= 2; a. 10 b. 120 c. 20 d. 12 e. code will not execute

C

Whereas < is called a relational operator, x < y is called a(n) a. arithmetic operator b. relative operator c. relational expression d. arithmetic expression e. None of these

C

Which value can be entered to cause the following code segment to display the message "That number is acceptable"? int number; cin >> number; if (number > 10 && number < 100) cout << "That number is acceptable.\n"; else cout << "That number is not acceptable.\n"; a. 100 b. 10 c. 99 d. 0 e. all of these

C

As a rule of style, when writing an if statement you should indent the conditionally-executed statements.

T

What is the value of the following expression? true || false a. true b. false c. -1 d. +1 e. None of these

A

After the following code executes, what is the output if user enters 0? int x = -1; cout << "Enter a 0 or 1: "; cin >> x; if (c) cout << "true" << endl; else cout << "false" << endl; a. nothing will be displayed b. false c. x d. true e. 0

B

What is the output of the following code segment if the user enters 90 for the score? cout << "Enter your test score: "; cin >> test_score; if (test_score < 60) cout << "You failed the test." << endl; if (test_score > 60) cout << "You passed the test." else cout << "You need to study harder next time." << endl; a. You failed the test. b. You passed the test. c. You need to study harder next time. d. You failed the test. You need to study harder next time. e. You passed the test. You need to study harder next time.

B

What is the value of the following expression? true && false a. true b. false c. -1 d. +1 e. None of these

B

When a relational expression is false, it has the value a. 1 b. 0 c. 0, 1, or -1 d. -1 e. None of these

B

Both of the following if statements perform the same operation. 1. if (sales > 10000) commissionRate = 0.15; 2. if (sales > 10000) commissionRate = 0.15;

T

If the expression on the left side of the following is false, the expression on the right side will not be checked. (a > = b) && (c == d)

T

If the expression on the left side of the following is true, the expression on the right side will not be checked. (a > = b) || (c == d)

T

You should be careful when using the equality operator to compare floating point values because of potential round-off errors.

T