EXAMINATION FOR THE BSC (HONS) INFORMATION SYSTEMS; BSC (HONS) INFORMATION TECHNOLOGY & BSC (HONS) COMPUTER SCIENCE; YEAR 1

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1 FACULTY OF SCIENCE AND TECHNOLOGY EXAMINATION FOR THE BSC (HONS) INFORMATION SYSTEMS; BSC (HONS) INFORMATION TECHNOLOGY & BSC (HONS) COMPUTER SCIENCE; YEAR 1 ACADEMIC SESSION 2014; SEMESTER 1 & 2 FINAL JULY 2014 EXAM CYCLE TIME: 2 HOURS + 10 MINUTES READING TIME INSTRUCTIONS TO CANDIDATES This question booklet contains two sections. Section A: Answer the compulsory questions. Section B: Answer two questions out of three questions All answers must be written in the answer booklets provided using blue or black INK IMPORTANT NOTES TO CANDIDATES Materials Allowed Standard Items : Pen, Pencil, Eraser or Correction Fluid, Ruler Special Items : Non Programmable Calculators It is your responsibility to ensure that you do NOT have in your possession any unauthorised notes or any other means that would improperly help you in your work. If you have any unauthorised materials with you, hand it to the invigilator BEFORE reading any further. DO NOT REMOVE THIS QUESTION PAPER FROM THE EXAMINATION HALL [This paper contains FOUR questions printed on SIX pages]

2 Section A Compulsory section Question 1 (50 marks) a) Regardless of differences in physical appearance, virtually every computer may be envisioned as divided into six logical units or sections. List and elaborate the roles and functions for each logical unit. b) C programs consist of modules or pieces called functions. What is the difference between user-defined functions and C Standard Library functions? What is the benefits of using C Standard Library, explain your answer. c) Draw a diagram to show and explain the typical C program development environment. d) Given an integer array num which contains 20 elements, write statements to calculate the total odd values contained in the array num. e) What will be the output of the codes below: (12 marks) (6 marks) (12 marks) (5 marks) (6 marks) int a = 3; printf( "A\tA+2\tA+4\tA+6\n\n" ); while ( a <= 15 ) { printf("%d\t%d\t%d\t%d\n",a, a + 2, a + 4, a + 6); a += 3; 1

3 f) What will be the output of the program below: (3 marks) int c; c = 5; printf( %d\n, c); printf( %d\n, c++); printf( %d\n\n, c); c = 5; printf( %d\n, c); printf( %d\n, ++c); printf( %d\n\n, c); g) What will be the output of the program below if the user enter the square side = 3 : (6 marks) 2

4 Section B Answer any TWO questions from this section. Question 2 (25 marks) a) State whether the following are true or false: (10 marks) i) Comments cause the computer to print the text enclosed between /* and */ on the screen when the program is executed. ii) A sentinel value must be a value that cannot be confused with a legitimate data value. iii) All arguments following the format control string in a printf function must be preceded by an ampersand (&). iv) The remainder operator (%) can be used only with integer operands. v) The default case is required in the switch selection statement. vi) The expression (x > y && a < b) is true if either x > y is true or a < b is true. vii) An expression containing the operator is true if either or both of its operands is true. viii) ix) An array subscript can be of data type double. An individual array element that is passed to a function as an argument of the form a[i] and modified in the called function will contain the modified value in the calling function. x) It is an error if an initializer list contains more initializers than there are elements in the array. b) Write the function header for each of the following functions: i) Function hypotenuse that takes two double-precision floating-point arguments, side1 and side2, and returns a double-precision floating-point result. ii) Function smallest that takes three integers, x, y, z, and returns an integer. iii) Function instructions that does not receive any arguments and does not return a value. [Note: Such functions are commonly used to display instructions to a user.] iv) Function inttofloat that takes an integer argument, number, and returns a floating-point result. c) Calculate the value of 2.5 raised to the power of 3 using the pow function. Write a statement to print the result with a precision of 2 in a field width of 10 positions. What is the value that prints? (3 marks) 3

5 d) Write a segment of C codes to produce the following pattern using any nested repetition control structure: (4 marks) ********** ********* ******** ******* ****** ***** **** *** ** * Question 3 (25 marks) a) What is the output of the C program below: (6 marks) int main (void) { unsigned int = 1, total = 0, y; while (x <= 10 ) { y = x * x ; printf( %d\n,y); total += y; ++x; printf( Total is %d\n, total); b) Identify and correct errors in each of the following: i) if ( age >= 65 ); printf( "Age is greater than or equal to 65\n" ); else printf( "Age is less than 65\n" ); ii) while ( y > 0 ) { printf( "%d\n", y ); ++y; iii) int x = 1, total; while ( x <= 10 ) { total += x; ++x; 4

6 c) Write statements to accomplish the following: i) Define a pointer, nptr, that points to a variable of type float. ii) iii) iv) Write two different statements to assign the starting address of array num1 to the pointer variable nptr. Write a statement to print the 10 integer elements of array num1 in a predefined for loop below by using pointer subscript notation with nptr which you ve defined in section (ii). for ( i = 0; i < 10; i++ ) { /* insert your statement here */ Write a statement to print the value of the integer variable pointed to by pointer fptr. v) Assume a val array that contains five unsigned integer elements (each element is stored in 2 bytes) and the starting address of the val array is at location in memory. Study the below C statements and define what address is referenced by vptr + 3? And, what value is stored at that location? unsigned int val [5] = { 2, 4, 6, 8, 10 ; unsigned int *vptr; vptr = val; d) Name two ways to pass arguments to a function and describe briefly the difference between them. (3 marks) Question 4 (25 marks) a) Write a for statement that print the following sequence of values: (4 marks) 20, 11, 2, -7, -16, -25, -34, -43, b) Rewrite your solution using a while..do or do..while statement. (4 marks) c) Write statements to accomplish each of the following: i) Display the value of the seventh element of character array f. 5

7 ii) iii) Input a value into element 4 of single-subscripted floatingpoint array b. Initialize each of the 5 elements of single-subscripted integer array g to 8. iv) Total the elements of floating-point array c of 100 elements. d) Write a segment of codes in C language that will find the smallest and the largest value stored in an integer array num of size 100 and print both values at the end of the codes. (9 marks) ~ END OF PAPER ~ 6