Computer Programming: Chapter 4

What will the following program display? #include 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; }

This is a variable, usually a boolean or an integer, that signals when a condition exists.

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

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

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

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)

Relational operators allow you to ____________ numbers.

The default section is required in a switch statement.

If the sub-expression on the left side of an && operator is false, the expression on the right side will not be checked.

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;

Which line in the following program will cause a compiler error? 1 #include 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 }

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

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

This operator represents the logical AND.

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

If the sub-expression on the left side of an && operator is false, the expression on the right side will not be checked.

In C++ the = operator indicates

What is the output of the following segment of code if 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;

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

This statement lets the value of a variable or expression determine where the program will branch to.

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

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?

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

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;

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;

This operator performs a logical NOT operation.

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

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