COS1512 EXAM PACK 2027 {DETAILED QUESTIONS AND ANSWERS }

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Question 1
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This question is based on question 1 in the written Assignment 4.
The program in question 1 of the written assignment, contains an incomplete recursive
function raised_to_power(). This function returns the value of the first
parameter number of type float raised to the value of the second parameter power of
type int for all values of power greater than or equal to 0.
The correct function header for the function raised_to_power() is
Select one:
float raised_to_power(float number, int power)
int raised_to_power(float number, int power)
float raised_to_power(int number, float power)
float raised_to_power(float number, float power)
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The correct answer is: float raised_to_power(float number, int power)

Question 2
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This question is based on question 1(b) in the written Assignment 4.
The program in question 1 of the written assignment, contains an incomplete recursive
function raised_to_power(). This function returns the value of the first
parameter number of type float raised to the value of the second parameter power of
type int for all values of power greater than or equal to 0.
Based on the fact that any value raised to the power of 0 is 1, the base case for this
function is
Select one:
else if (power == 0)
return (1.0);
else if (power == 1)
return (1.0);
else if (power > 0)
return (1.0);




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else if (power == 0)
return (number * raised_to_power(number, power - 1));
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The correct answer is: else if (power == 0)
return (1.0);

Question 3
Incorrect
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This question is based on work for question 1 in the written Assignment 4.
With recursion, the base case must eventually be reduced to a general case.
Select one:
True
False
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The correct answer is 'False'.

Question 4
Incorrect
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This question is based on question 2(a) in the written Assignment 4. Question 2 included a
code fragment that you had to answer questions on. This is an extract from the code
fragment:
6: class A
7: {
8: private:
9: int x;
10: protected:
11: int getX();
12: public:
13: void setX();
14: };
15:
16: int A::getX()




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17: {
18: return x;
19: }
20:
21: void A::setX()
22: {
23: x=10;
24: }


The reason why line 18 is a valid access in this code fragment, is because the variable x is a
private data member of the class A. Private data members can only be accessed by other
member functions and operators of the class A. getX() is a member function of class A and
therefore line 18 is a valid access.
Select one:
True
False
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The correct answer is 'True'.

Question 5
Incorrect
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Question text
This question is based on question 2(c) in the written Assignment 4. Question 2 included a
code fragment that you had to answer questions on. This is an extract from the code
fragment:
27: class B
28: {
29: private:
30: int y;
31: protected:
32: A objA;
33: int getY();
34: public:
35: void setY();
37: };




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