Starting out with C++ Chapter 4 Quiz

What will be the value of result after the following code has been executed? int a = 60; int b = 15; int result = 10; if (a = b) { result *= 2; }

20

Which line in the following program will cause a compiler error? 1 #include <iostream> 2 using namespace std; 3 4 int main() 5 { 6 int number = 5; 7 8 if (number >= 0 && <= 100) 9 cout << "passed.\n"; 10 else 11 cout << "failed.\n"; 12 return 0; 13 }

8

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"; }

99

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 << "This is all folks!" << endl;

This is true! This is all folks!

What is the value of the following expression? true && false

false

What is the value of donuts after the following code executes? int donuts = 10; if (donuts != 10) { donuts = 0; } else { donuts += 2; }

12

Input values should always be checked for:

Appropriate range Reasonableness Division by zero, if division is taking place

What will the following segment of code output if the value 11 is entered at the keyboard? int number; cin >> number; if (number > 0) { cout << "C++"; } else { cout << "Soccer"; } cout << " is "; cout << "fun" << endl;

C++ is fun

If you intend to place a block of statements within an if statement, you must place these around the block.

Curly braces { }

Whereas < is called a relational operator, x < y is called a(n) ________.

Relational expression

What will the following segment of code output? score = 40; if (score > 95) cout << "Congratulations!\n"; cout << "That's a high score!\n"; cout << "This is a test question!" << endl;

That's a high score! This is a test question!

If you place a semicolon after the statement: if (x < y)

The compiler will interpret the semicolon as a null statement.

What will the following segment of code output? Assume the user enters a grade of 90 from the keyboard. cout << "Enter a test score: "; cin >> test_score; if (test_score < 60); cout << "You failed the test!" << endl; if (test_score > 60) cout << "You passed the test!" << endl; else cout << "You need to study for the next test!";

You failed the test! You passed the test!

Given that, x = 2, y = 1, and z = 0, what will the following cout statement display? cout << "answer = " << (x || !y && z) << endl;

answer = 1

Without this statement appearing in a switch construct, the program "falls through" all of the statements below the one with the matching case expression.

break

Relational operators allow you to do what with numbers.

compare

What will be the output of the following code segment after the user enters 0 at the keyboard? int x = -1; cout << "Enter a 0 or a 1 from the keyboard: "; cin >> x; if (x) { cout << "true" << endl; } else { cout << "false" << endl; }

false

This is a variable, usually a bool or an int, that signals when a condition exists.

flag

When a program lets the user know that an invalid choice has been made, this is known as:

input validation

When an if statement is placed within the conditionally-executed code of another if statement, this is known as:

nesting

This operator performs a logical NOT operation.

!

This operator takes an operand and reverses its truth or falsehood.

!

This operator represents the logical AND.

&&

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

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; }

1

Given the following code segment, what is output after "result = "? int x = 1, y = 1, z = 1; y = y + z; x = x + y; cout << "result = " << (x < y ? y : x) << endl;

3

What is the value of the following expression? false || true

true

What is the value of the following expression? true && true

true

What is the value of donuts after the following code executes? int donuts = 10; if (donuts = 1) { donuts = 0; } else { donuts += 2; }

0

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" and then advance to a new line?

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

What is the output of the following segment of code if the value 4 is input by the user when asked to enter a number? 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;

13

The default section of a switch statement performs a similar task as the ________ portion of an if/else if statement.

trailing else

Which of the following expressions will determine whether x is less than or equal to y?

x <= y

This operator is known as the logical OR operator.

||

What will the following program segment display? 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;

1 1

Assuming x is 5, y is 6, and z is 8, which of the following is false? 1. x == 5; 2. 7 <= (x + 2); 3. z <= 4; 4. (1 + x) != y; 5. z >= 8; 6. x >= 0; 7. x <= (y * 2)

3 and 4 are false.

What will the following program display? #include <iostream> using namespace std; int main() { int a = 0, b = 2, x = 4, y = 0; cout << (a == b) << " "; cout << (a != b) << " "; cout << (b <=x) << " "; cout << (y > a) << endl; return 0; }

0 1 1 0

After execution of the following code, what will be the value of input_value if the value 0 is entered at the keyboard at run time? cin >> input_value; if (input_value > 5) { input_value = input_value + 5; } else if (input_value > 2) { input_value = input_value + 10; } else { input_value = input_value + 15; }

15

The ________ of a variable is limited to the block in which it is declared.

scope