
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Question
Consider the following Java method:
static public int fido(int n)
// pre: n is a positive integer
// post: result is the nth term from the sequence
// 1, 3, 7, 15, 31, 63, 127, ...
{
int result = 1;
if (n > 1) result = 1+fido(n-1)+fido(n-1);
// assertion: the above if condition was tested
// fido(n) times while computing result
return result;
}
a. What does it compute?
b. Prove or disprove the informal assertion following the if statement.
c. What is the time complexity of the method?
d. Why is fido an appropriate name for this method?
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