August 2000
CA208 : 'C' PROGRAMMING

QUESTION 5

Total Marks: 15 Marks

• Question 1
• Question 2
• Question 3
• Question 4
• Cover Page

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SUGGESTED SOLUTIONS
for Question 5

(a) Give an example of a program control flow statement in C. [1 mark]

(b) Explain what is meant by the base case of a recursive test, and explain why it is necessary for a recursive test to have a base case. [2 marks]

(c) Explain the difference between stack and heap allocated data in C. [2 marks]

(d) The following function is intended to swap the integers a and b. Identify the problem with this function, and show how this could be remedied.
void Swap(int a, intb) {
  int temp= b;
  b= a;
  a= temp;
}
[2 marks]

(e) Write a function that prompts the user to enter a number in the range 0 - 5. If the number is not in that range, the prompt should be repeated, else the function should return the number input. [4 marks]

(f) Implement the recursive procedure Remainder, such that it takes three parameters, a number, a divisor and a remainder. The function should recursively subtract the divisor from the number until only the remainder remains; and return the remainder to the caller. [4 marks]