Consider the recursive method shown below:
Public static int strangeCalc(int bottom, int top)
{
If (bottom top)
{
Return -1;
}
Else if (bottom == top)
{
Return 1;
}
Else
{
Return bottom * strangeCalc(bottom + 1, top);
}
}
What value will be returned with a call to strangeCalc(4,7)?
A) 1
B) -1
C) 120
D) 840

Question

Consider the recursive method shown below:
Public static int strangeCalc(int bottom, int top)
{
If (bottom > top)
{
Return -1;
}
Else if (bottom == top)
{
Return 1;
}
Else
{
Return bottom * strangeCalc(bottom + 1, top);
}
}
What value will be returned with a call to strangeCalc(4,7)?
A) 1
B) -1
C) 120
D) 840

Quizplus · Accepted Answer

The method multiplies the current bottom value with the result of the same method called with a bottom value incremented by 1 until it reaches the top value. In this case, the method will be called with the parameters (4,7), and it will perform the following calculations:
- strangeCalc(4,7) = 4 * strangeCalc(5,7)
- strangeCalc(5,7) = 5 * strangeCalc(6,7)
- strangeCalc(6,7) = 6 * strangeCalc(7,7)
- strangeCalc(7,7) = 1 (because bottom == top)
Substituting the values, we get:
- strangeCalc(4,7) = 4 * strangeCalc(5,7) = 4 * 5 * strangeCalc(6,7) = 4 * 5 * 6 * strangeCalc(7,7) = 4 * 5 * 6 * 1 = 120.
Therefore, the method will return the value 120.

Consider the Recursive Method Shown Below