## COMP122 Practice Final Exam

Instructions: There are 50 questions on this test. It is written in a style very similar to the REAL final exam. Choose the best answer from among those given. Click the GRADE button on the bottom of the form when you want the exam graded.

Note: You can practice this test as many times as you desire; the system will cook you up a fresh batch of questions each time you access this page.

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1. Given the following declaration:

int Values;

Which expression below is equivalent to: &Values?

a) Values
b) Values[-1]
c) Values
d) None of these

2. Which declaration below would be correct to make "pVar" a pointer to int type?

a) int pVar;
b) int* pVar;
c) int &pVar;
d) None of these

3. A 'for' loop is written as follows:

for(i=0 ; i<25 ; i++)
printf("Testing %d\n", i);

What will the highest and lowest printed values of 'i' be?

a) 1 and 25
b) 0 and 26
c) 0 and 24
d) None of the above

4. Given the following declaration:

int Values={1,2,3,4};

What value will be returned if the expression "*(Values+2)" is evaluated?

a) 2
b) 1
c) 3
d) Insufficient information given to solve problem.

5. Which of these lists the fundamental data types of the C language in correct order of precision?

a) INT - CHAR - FLOAT - LONG INT - DOUBLE
b) INT - CHAR - DOUBLE - LONG INT - FLOAT
c) FLOAT - CHAR - INT - LONG INT - DOUBLE
d) CHAR - INT - LONG INT - FLOAT - DOUBLE
e) None of the above

6. What will the output of the following code be?

double Zeta; // Holds ratio of alpha/w(nat)

Zeta = 0.707107; // Less than critically damped system
printf("Damping ratio = %10.1lf\n", Zeta );

a) Damping ratio = 0.707107
b) Damping ratio = 0.707
c) Damping ratio = 0.7
d) None of these

7. When do C functions need to be prototyped in single-source-file projects?

a) Prototyping is always optional in C as long as a single file contains all the source code.
b) When functions are called before they are defined (i.e., function 'below' use in listing.)
c) Prototyping is always required, regardless of where the functions are used.
d) None of the above

8. Given the declarations:

char szData;
int i;

i=314;

Supposed that we wish to place a text message into szData that shows the value in variable i. Which of the statements below would accomplish this?

a) strcpy( szData , "i = %d", i);
b) sprintf( szData , "i = %d" , i );
c) strcat( szData , i , "i = %d" );
d) None of these

9. What output will be produced by the DO loop below?

int i=2;

do  {
i++;
if (i==7) continue;
printf("%d", i);
}
while(i<10);

a) 3 4 5 6 7 8 9
b) 2 3 4 5 6 7 8
c) 3 4 5 6 8 9 10
d) None of the above

10. What is object code?

a) Incomplete machine code
b) Instructions typed in by the programmer
c) The result of the C preprocessor's operation
d) None of the above

11. What will be in variable 'A' after executing the following code?

int a,b;

b = 24;
a = b++;

a) 24
b) 25
c) 23
d) None of the above

12. What information must be passed to the STRCPY() library routine?

a) The length of each string, and the address of each string.
b) The address of each string.
c) The length of one of the strings.
d) None of these

13. What are the objects in programming?

a) The computer's instructions
b) The data
c) The constants
d) None of the above

14. What is wrong with the following code?

int nValue = 25;
float* fAddr;

fAddr = &nValue;
*fAddr = *fAddr + 1;

a) It is illegal to use the expression *fAddr on the left side of an equals sign.
b) The pointer "fAddr" has not been loaded with the address of an object.
c) The pointer "fAddr" is of the wrong type (float*).
d) None of these

15. What will be the output of the following FOR loop?

for(i=0 ; i<5 ; i++)
{
if (i==2) break;
printf("%d", i);
}

a) 0 1 2 3 4
b) 1 2 3 4 5
c) 1 3 4 5
d) None of the above

16. What is the meaning of the following declaration?

float* pVar;

a) pVar is a pointer to data of type FLOAT
b) pVar is a floating point variable
c) pVar is meant to have an initial value of zero
d) None of these

17. What will be in variable 'A' after executing the following code?

int a,b;

b = 24;
a = ++b + 10;

a) 34
b) 35
c) 33
d) None of the above

18. In C, a logical AND is indicated by what operator?

a) &&
b) ||
c) ++
d) None of the above

19. What is special about the NULL pointer value?

a) The NULL pointer automatically dereferences the target object.
b) Arrays can only be accessed if a NULL pointer is used.
c) The NULL pointer is obtained when a disk I/O error occurs.
d) None of these

20. What is the default data type returned by C functions?

a) int
b) float
c) void
d) None of the above

21. If A=1 upon entry into the code below, what will be output?

switch (a)
{
case 1: printf("TV is on.");

case 2: printf("Stereo is on.");
break;

case 3: printf("Room lights dimmed.");
break;

default: printf("Say what?");
break;
}

a) TV is on.
b) TV is on. Stereo is on.
c) Room lights dimmed.
d) Say what?

22. Given the following declaration:

int Values={1,2,3,4};

What value will be returned if the expression "*Values" is evaluated?

a) 2
b) 1
c) &Values
d) 4
e) None of these

23. What is the effect of a return statement within MAIN()?

a) The program starts over at the first statement in MAIN()
b) The program ends and control goes back to the operating system
c) The last executed instruction repeats
d) None of the above

24. What is the effect of the break statement?

a) The body of a running loop is repeated
b) A running loop is exited, execution resumes at next statement after loop
c) The loop counter is decremented by 1
d) None of the above

25. What is wrong with the function below?

float MyFunct(int x, float z)
{
float x2;

x2 = z*z + x;
}

a) Function defined as type FLOAT but fails to return a value
b) A semicolon is required on the first line 'float MyFunct(int x, float z);'
c) The function is returning the wrong data type (INT)
d) None of the above

26. What is the result of evaluating the following expression?

22/7. + 5/3

a) 4.142857...
b) 4.809523...
c) 5
d) None of the above

27. The instructions typed by a programmer that will be compiled and executed by the computer are called:

a) Source code
b) Machine code
c) Object code
d) None of the above

28. Which of these lists the products of a C compilation session in correct order?

a) Assembly code - Source code - Object code - Machine code
b) Machine code - Object code - Source code - Assembly code
c) Source code - Assembly code - Object code - Machine code
d) None of these

29. If A=2 upon entry into the code below, what will be output?

switch (a)
{
case 1: printf("Unlocking door.");
break;

case 2: printf("Checking back door.");
break;

case 3: printf("Locking door.");
break;

default: printf("Unknown command.");
break;
}

a) Checking back door
b) Unlocking door
c) Locking door
d) Unknown command

30. What is something that can not be done with a VOID pointer?

a) Dereferencing
b) Assignment of pointer value
c) Type-casting pointer contents to another type
d) None of these

31. If the character sequence CR-LF ('\r' '\n') is encountered while reading a text file, what character sequence will result on the C side of the interface?

a) '\r'
b) '\r' '\n'
c) '\0' (NUL)
d) None of the above

32. Which type of font below looks best when shown at different magnification levels on a video screen?

a) Bit-mapped
b) Imaginary
c) Stroked (Vector)
d) None of the above

33. Which stream below is normally associated with the keyboard?

a) stdout
b) stderr
c) stdprn
d) stdaux
e) None of the above

34. Given the following declaration:

struct Complex
{
double re;
double im;
};

Complex Values;

If a DOUBLE uses 8 memory locations, how much memory is used up?

a) 160
b) 80
c) 40
d) None of these

35. When programming graphics under the DOS environment, what is typically done first within a program?

a) Close all open files
b) Read and save the current video mode
c) Clear the video screen
d) None of the above

36. Which statement below would correctly allocate an array of 500 integers by using the 'NEW' operator?

a) int* Array = new int;
b) new int Array;
c) Array = new int;
d) None of the above

37. The pointer value obtained from the 'FOPEN()' function (when used to open a disk file) is often referred to by programmers as a/an:

a) Array
b) Structure
c) Handle
d) None of the above

38. What value is returned by the NEW operator when a memory allocation request fails?

a) -1
b) NULL pointer
c) 0xffff
d) None of the above

39. What is a stream?

a) A path of communication between a program and the operating system
b) A method for writing to the video screen
c) A method for checking the contents of variables
d) None of the above

40. Given the following declaration:

struct Complex
{
double re;
double im;
};

If a DOUBLE uses 8 memory locations, how much memory is used up?

a) 8 locations
b) 16 locations
c) 0 locations
d) None of these

41. In the Borland Graphic Interface, the coordinates (0,0) represent what?

a) The ULH corner of the video display
b) The URH corner of the video display
c) The center of the video display
d) None of the above

42. Given the following declaration:

struct Complex
{
double re;
double im;
};

double GetMagnitude(Complex* lpStr)
{
//...
}

To access the member 're' within the function, what notation would be used?

a) lpStr->re
b) lpStr.re
c) re
d) None of the above

43. Which operator is used to access the member elements of a structure?

a) "*"
b) "."
c) "&"
d) None of these

44. Why is it important to open a file in the binary mode when reading and writing in-memory contents such as structures?

a) To avoid undesired translation of certain memory content values
b) To allow automatic error checking of the file contents by the operating system
c) To minimize disk space requirements
d) None of the above

45. Which standard library function below is used to move the file position indicator when implementing a random-access binary file system?

a) fopen()
b) fseek()
c) fputs()
d) None of the above

46. Which standard stream below could be used to talk to a printer?

a) stdout
b) stdprn
c) stderr
d) stdaux
e) None of the above

47. Which of these is a disadvantage of Stroked (Vector) fonts?

a) A large amount of memory is required
b) Only one color of text can be displayed
c) Rendering is a complex and slow process
d) None of the above

48. Which standard stream below could be used to talk to the video display?

a) stdprn
b) stderr
c) stdout
d) stdaux
e) None of the above

49. Given the following declaration:

struct Complex
{
double re;
double im;
};

Complex Values[ xx ];

If there are 1732 memory locations free, what is the maximum value that "xx" can have, assuming that a DOUBLE uses 8 memory locations?

a) 216
b) 108
c) 132
d) None of these

50. What must be done with open files prior to ending a program?

a) Close them
b) Write the final information into them
c) Check their contents
d) None of the above

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