Test Questions & Answers Ch3 Expressions And Interactivity

Starting Out with C++ from Control Structures to Objects, 9e (Gaddis)

Chapter 3 Expressions and Interactivity

TRUE/FALSE

1. When the fixed manipulator is used, the value specified by the setprecision manipulator will be the number of digits to appear after the decimal point.

2. The only difference between the get function and the >> operator is that get reads the first character typed, even if it is a space, tab, or the [Enter] key.

3. The cin << statement will stop reading input when it encounters a newline character.

4. If you want to know the length of the string that is stored in a string object, you can call the object's size member function.

5. Arithmetic operators that share the same precedence have right to left associativity.

6. When C++ is working with an operator, it strives to convert the operands to the same type.

7. When a program uses the setw manipulator, the iosetwidth header file must be included in a preprocessor directive.

8. The following statement will output $5.00 to the screen:

cout << setprecision(5) << dollars << endl;

9. In C++, it is impossible to display the number 34.789 in a field of 9 spaces with 2 decimal places of precision.

10. The fixed manipulator causes a number to be displayed in scientific notation.

MULTIPLE CHOICE

1. The __________ causes a program to wait until information is typed at the keyboard and the [Enter] key is pressed.

2. The __________ operator always follows the cin object, and the __________ operator follows the cout object.

3. Which of the following must be included in any program that uses the cin object?

4. When a user types values at the keyboard, those values are first stored

5. Which of the following will allow the user to input the values 15 and 20 and have them stored in variables named base and height, respectively?

6. What will be displayed after the following statements execute?

int num1 = 5;

int num2 = 3;

cout << "The result is " << (num1 * num2 + 10) << endl;

7. What is the value of result after the following statement executes?

result = (3 * 5) % 4 + 24 / (15 - (7 - 4));

8. In the following statement, what will be executed first according to the order of precedence?

result = 6 - 3 * 2 + 7 - 10 / 2;

9. Associativity is either right to left or

10. What is the value of x after the following code executes?

int x = 0;

int y = 5;

int z = 4;

x = x + y + z * 2;

11. What is the value of average after the following code executes?

double average;

average = 1.0 + 2.0 + 3.0 / 3.0;

12. What is the value of cube after the following code executes?

double cube, side;

side = 5.0;

cube = pow(side, 3.0);

13. When the final value of an expression is assigned to a variable, it will be converted to

14. When C++ is working with an operator, it strives to convert operands to the same type. This is known as

15. When a variable is assigned a number that is too large for its data type, it

16. What is the value of x after the following code executes?

int x;

x = 3 / static_cast<int>(4.5 + 6.4);

17. Which statement is equivalent to the following?

number += 1;

18. Which statement is equivalent to the following?

number = number * 2;

19. What is the value of number after the following statements execute?

int number = 10;

number += 5;

number -= 2;

number *= 3;

20. This manipulator is used to establish a field width for the value that follows it:

21. This manipulator causes the field to be left justified with padding spaces printed to the right:

22. You can control the number of significant digits in your output with the __________ manipulator.

23. This manipulator forces cout to print digits in fixed-point notation:

24. What is true about the following statement?

cout << setw(4) << num4 << " ";

25. Which of the following statements will pause the screen until the [Enter] key is pressed?

26. Which of the following statements will allow the user to enter three values to be stored in variables length, width, and height, in that order?

27. Which of the following functions tells the cin object to skip one or more characters in the keyboard buffer?

28. __________ reads a line of input, including leading and embedded spaces, and stores it in a string object.

29. Which of the following statements will read an entire line of input into the string object, address?

30. How many characters will the following statement read into the variable myString?

cin >> setw(10) >> myString;

31. The function pow(x, y), requires which header file?

32. To use the rand()function, you must include the __________ header file?

33. Which of the following functions will return the value of x, rounded to the nearest whole number?

34. Which line in the following program will cause a compiler error?

1 #include <iostream>

2 using namespace std;

3

4 int main()

5 {

6 const int MY_VAL = 77;

7 MY_VAL = 99;

8 cout << MY_VAL << endl;

9 return 0;

10 }

35. A debugging process where you, the programmer, pretend you are a computer and step through each statement while recording the value of each variable at each step is known as