Exam 4: Making Decisions

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

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

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

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;

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

What will the following program segment display? int funny = 7, serious = 15; funny = serious % 2; if (funny != 1) { $\quad$ funny = 0; $\quad$ serious = 0; } else if (funny == 2) { $\quad$ funny = 10; $\quad$ serious = 10; } else { $\quad$ funny = 1; $\quad$ serious = 1; } Cout << funny << " " << serious << endl;

This operator is used in C++ to represent equality.

In C++ the = operator indicates

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

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

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

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

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

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

x <= (y * 2)

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?

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) $\quad$ input_value = input_value + 5; else if (input_value > 2) $\quad$ input_value = input_value + 10; else $\quad$ input_value = input_value + 15;

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

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

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;