Question

in c++

1)Recursion occurs when a function's statements include a call to the function itself. There's no particular difference in how the parameters are defined.

A)True

B)False

2)Indicate whether the relationship of the following everyday item is an is-a or has-a relationship:

(True or False) Camera / Lens is a is-a relationship.

A)True

B)False

Answer 1

1. True, the parameters are defined in the same way. However they are always called differently inside the recursive functions that is the values of the parameters are different.

For example:

In a program for calculating the factorial of a number using recursion, the function is defined as:

int factorial(int num)

{

if (num > 1)

return n*factorial(num - 1); // the program would fall in an infinite loop if that -1 is not there

else

return 1;

}

2. False. Camera has a lens. Camera isn't a lens.

Is-a relationships are defined by inheritance. For example: Dog is an Animal. Potato is a vegetable.

Has-a relationships are defined by composition. For example: A motorbike has an engine.