Chapter 6 Complete Test Bank Functions

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

Chapter 6 Functions

TRUE/FALSE

1. When a function is called, flow of control moves to the function's prototype.

2. A parameter is a special purpose variable that is declared inside the parentheses of a function definition.

3. A local variable and a global variable may not have the same name within a program.

4. A static variable that is defined within a function is initalized only once, the first time it is called.

5. It is possible for a function to have some parameters with default arguments and some without.

6. A function's return data type must be the same as the function's parameters.

7. One reason for using functions is to break programs into manageable units or modules.

8. You must always furnish an argument with a function call.

9. Global variables are initialized to zero by default.

10. Local variables are initialized to zero by default.

11. It is not considered good programming practice to declare all your variables globally.

12. You may use the exit() function to terminate a program, regardless of which control mechanism is executing.

MULTIPLE CHOICE

1. A collection of statements that performs a specific task is a(n)

2. A function __________ contains the statements that make up the function.

3. A function can have no parameters, one parameter, or many parameters and can return __________ value(s).

4. A function is executed when it is

5. Functions are ideal for menu-driven programs. When the user selects a menu item, the program can __________ the appropriate function.

6. This type of variable is defined inside a function and is not accessible outside the function.

7. The value in this type of variable persists between function calls.

8. These types of arguments are passed to parameters automatically if no argument is provided in the function call.

9. When used as parameters, these types of variables allow a function to access the parameter's original argument:

10. __________ functions may have the same name as long as their parameter lists are different.

11. This statement causes a function to end.

12. This function causes a program to terminate, regardless of which function or control mechanism is executing.

13. Which of the following causes a function to execute?

14. It is good programming practice to __________ your functions by writing comments that describe what they do.

15. A(n) __________ is information that is passed to a function, and a(n) __________ is information that is received by a function.

16. A function _________ eliminates the need to place a function definition before all calls to the function.

17. A _________ variable is declared outside all functions.

18. If a function is called more than once in a program, the values stored in the function's local variables do not _________ between function calls.

19. A __________ argument is passed to a parameter when the actual argument is left out of the function.

20. If a function does not have a prototype, default arguments may be specified in the __________.

21. The value in a __________ variable persists between function calls.

22. Given the following function:

void calc (int a, int& b)

{

int c;

c = a + 2;

a = a * 3;

b = c + a;

}

What is the output of the following code segment that invokes calc():

int x = 1;

int y = 2;

int z = 3;

calc(x, y);

cout << x << " " << y << " " << z << endl;

23. EXIT_FAILURE and ________ are named constants that may be used to indicate success or failure when the exit() function is called.

24. This is a dummy function that is called instead of the actual function it represents:

25. What will the following code display?

#include <iostream>

using namespace std;

void showDub(int);

int main()

{

int x = 2;

showDub(x);

cout << x << endl;

return 0;

}

void showDub(int num)

{

cout << (num * 2) << endl;

}

26. What will the following code display?

#include <iostream>

using namespace std;

void doSomething(int);

int main()

{

int x = 2;

cout << x << endl;

doSomething(x);

cout << x << endl;

return 0;

}

void doSomething(int num)

{

num = 0;

cout << num << endl;

}

27. What will the following code display?

#include <iostream>

using namespace std;

void doSomething(int&);

int main()

{

int x = 2;

cout << x << endl;

doSomething(x);

cout << x << endl;

return 0;

}

void doSomething(int& num)

{

num = 0;

cout << num << endl;

}

28. Which line in the following program contains the prototype showDub function?

1 #include <iostream>

2 using namespace std;

3 void showDub(int);

4 int main()

5 {

6 int x = 2;

7 showDub(x);

8 cout << x << endl;

9 return 0;

10 }

11 void showDub(int num)

12 {

13 cout << (num * 2) << endl;

14 }

29. Which line in the following program contains the header for the showDub function?

1 #include <iostream>

2 using namespace std;

3 void showDub(int);

4 int main()

5 {

6 int x = 2;

7 showDub(x);

8 cout << x << endl;

9 return 0;

10 }

11 void showDub(int num)

12 {

13 cout << (num * 2) << endl;

14 }

30. Which line in the following program contains a call to the showDub function?

1 #include <iostream>

2 using namespace std;

3 void showDub(int);

4 int main()

5 {

6 int x = 2;

7 showDub(x);

8 cout << x << endl;

9 return 0;

10 }

11 void showDub(int num)

12 {

13 cout << (num * 2) << endl;

14 }

31. What is the data type of the following function prototype's parameter variable?

int myFunction(double);

32. What is the data type of the following function prototype's return value?

int myFunction(double);

33. In the following function prototype, how many parameter variables does this function have?

int myFunction(double, double, double);

34. What will the following code display?

#include <iostream>

using namespace std;

int getValue(int);

int main()

{

int x = 2;

cout << getValue(x) << endl;

return 0;

}

int getValue(int num)

{

return num + 5;

}

35. Given the following header for a function named computeValue, which of the following is a valid call to the function?

void computeValue(int value)

MULTIPLE RESPONSE

1. Select all that apply. Which of the following must be included in a function header?

2. Select all that apply. Which of the following statement(s) about global variables is(are) true?