COP 3014 Chapter 4

The conditional operator takes two operands.

False

The default section is required in a switch statement.

False

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

False

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

False

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

True

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

True

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

True

If the expression on the left side of the following is false, the expression on the right side will not be checked.

True

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)

True

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

True

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. 12

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. 15

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

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. a < 5 ? b = 12 : d = 30;

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. break

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. input validation

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 ANS: A

a. switch

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

a. true

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

a. true

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

a. true

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. 0

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. Hi, there!

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. You passed the test.

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. answer = 1

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. false

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

b. false

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. line 6

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. logical

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. the compiler will interpret the semicolon as a null statement

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

b. ||

This operator represents the logical AND: a. ++ b. || c. && d. @ 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. 0

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. 13

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. 20

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. 3 e. 5

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. 99

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

c. compare

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. if (code == 'C') cout << "This is a check\n";

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. nesting

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. relational expression

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. trailing else

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

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. !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. 1

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. 1

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. 1 1

. 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. All of these

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. This is true! That's all folks

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. curly braces { }

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. flag

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. result = 3

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. x <= y