Chapter 3

Mark the following statements as true or false. a. The extraction operator >> skips all leading whitespace characters when searching for the next data in the input stream. b. In the statement cin >> x;, x must be a variable. c. The statement cin >> x >> y; requires the input values for x and y to appear on the same line. d. The statement cin \(>>\) num; is equivalent to the statement \(n u m>>\operatorname{cin}\) e. You generate the newline character by pressing the Enter (return) key on the keyboard. f. The function ignore is used to skip certain input in a line.

Suppose num1 and num2 are int variables and symbol is a char variable. Consider the following input: 47 18 * 28 $ What value (if any) is assigned to num1, num2, and symbol after each of the following statements executes? (Use the same input for each statement.) a. cin >> num1 >> symbol >> num2; b. cin >> symbol >> num1 >> num2; c. cin >> num1; cin.get (symbol); cin >> num2; d. cin >> num1 >> num2; cin.get (symbol); e. cin.get (symbol); cin >> num1 >> num2;

Suppose x and y are int variables and z is a double variable. Assume the following input data: 37 86.56 32 What value (if any) is assigned to x, y, and z after each of the following statements executes? (Use the same input for each statement.) a. cin >> x >> y >> z; b. cin >> x >> z >> y; c. cin >> z >> x >> y;

Given the input: 46 A 49 and the C++ code: int x = 10, y = 18; char z = '*'; cin >> x >> y >> z; cout << x << " " << y << " " << z << endl; What is the output?

Suppose that x and y are int variables, z is a double variable, and ch is a char variable. Suppose the input statement is: cin >> x >> y >> ch >> z; What values, if any, are stored in x, y, z, and ch if the input is: a. 35 62.78 b. 86 32A 92.6 c. 12 .45A 32

Which header file must be included to use the function pow?

Which header file must be included to use the function sqrt?

include #include #include using namespace std; int main() { int x, y; string message; double z;… # What is the output of the following program? #include #include #include using namespace std; int main() { int x, y; string message; double z; x = 4; y = 3; z = 2.5; cout << static_cast(pow(x, 2.0)) << endl; cout << static_cast(pow(z, y)) << endl; cout << pow(x, z) << endl; cout << sqrt(36.0) << endl; z = pow(9.0, 2.5); cout << z << endl; message = "Using C++ predefined function"; cout << "Length of message = " << message.length() << endl; return 0; }

To use the functions peek and putback in a program, which header file(s) must be included in the program?

34 What value (if any) is assigned to num and discard after each of… # Suppose that num is an int variable and discard is a char variable. Assume the following input data: #34 What value (if any) is assigned to num and discard after each of the following statements executes? (Use the same input for each statement.) a. cin.get (discard); cin >> num; b. discard = cin.peek(); cin >> num; c. cin.get (discard); cin.putback (discard); cin >> discard; cin >> num;