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Cork Institute of Technology
Bachelor of Engineering (Honours) in Electronic Engineering – Stage 1
(NFQ – Level 8)
Summer 2007
Computer Science
(Time: 3 Hours)
Answer Question 1 and THREE others Examiners:^ Prof. G. Hurley Dr. S. Foley Mr. D. O’Donovan
- A soccer ground requires a computerised booking system to allocate seats in a terrace for a single match. The terrace consists of 15 rows of 50 seats each. (a) Using a stepwise refinement approach, design an algorithm to implement the booking system. The user should, through a menu system, be able to do the following: (i) Reserve seats; (ii) Determine if a seat is occupied; (iii) Display a list of all seats booked. [10 %] (b) Implement the algorithm designed in part (a) as a C program. Use functions with parameters where appropriate. [12 %] (c) Briefly describe how the data arrays and functions used in the system would be modified to allow a fan book tickets for a specific game in the season, e.g., the fan should be able to book three seats for the fourth game in the season. [3 %]
- (a) Describe, with the aid of examples, the syntax and operation of the FOR and WHILE loops.
[6 %] (b) Write a program to prompt the user to enter a value, t (^) final , in seconds between 0 and 15
seconds. Using the formula, ( ) 5 1 where 3 secs
t v t e^ τ τ
, write the resulting values
between 0 and t (^) final at 10 m s intervals to (i) on-screen and (ii) a file called “results.dat”, at increments of 0.01secs, in the following fashion:
Time t : Value v t ( ):
etc.
Hint: The C command double exp( double x ); generates the e x function [12 %]
(c) Show the modifications necessary to the program in (b) such that the user may enter the terminating voltage at which the program is required to stop. [7 %]
- (a) Describe the purpose and benefits of using a functional approach to writing programs. [5 %]
(b) Describe two possible uses of the return type of a function. [2 %]
(c) Write a function which calculates how many characters are uppercase within the string supplied as a parameter to the function called ‘UpperCaseCount’. The number of uppercase characters should be returned as the result of the function. [10 %]
(d) Write a function to reverse the contents of a string supplied as an argument. [8 %]
- (a) Write conditional expressions that check for the following (assume x and y are integers and
ch is a character) i. x is a number between 4 and 16 ii. x is any number other than 6 or 10. iii. ch is an uppercase character vi. x is a positive even number divisible by 12 v. x is an odd number between 3 and 9. [10 %]
(b) i. The code segment in Figure 5-1 does not operate as expected – explain why. [3 %] ii. How would you correct this situation? [3 %] #include <stdio.h> void main() { float count; count = 0.0; while (count != 3.4) { printf(“\n%f",count); count+=0.2; } } Figure 5-
(c) A student grade is derived from its mark as follows:
Mark Student Grade 100 - 80 A 79 - 60 B 59 - 40 C 39 - 0 F
Write a C function which will return the appropriate student grade representing the mark supplied as an argument. [9 %]
- (a) i. What are the three essential elements of a for loop? Illustrate your answer with examples. [6 %] ii. Describe the circumstances under which the use of a for loop would be deemed appropriate. [2 %]
(b) i. Rewrite the for loop in Figure 6-1 with (i) a while loop and (ii) a do-while loop.
for (x = 1;x<=20;x++) { printf (“x is %d\n”, x); printf (“x squared is %d\n”, x*x); } Figure 6-1 [6 %]
ii. Explain the difference between pre-test and post-test while loops. [3 %]
(c) Rewrite the nested if statements in code segment 6-2 with a single switch statement. if ((number == 5) || (number == 7)) printf (“Clause One\n”); else if ((number > 0) && (number < 4)) printf (“Clause Two\n”); else if (number==0) printf (“Clause Three\n”); else if ((number==6) ||(number > 7)&&(number <= 10)) { printf (“Clause ”); printf (“Four\n”); } else if (x==4) printf (“Clause Five\n”); Figure 6-2 [8 %]
