Java™ How To Program (Early Objects), Tenth Edition

Exercises

18.7 What does the following code do?

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 1   public int mystery(int a, int b) 2   { 3      if (b == 1) 4         return a; 5      else 6         return a + mystery(a, b - 1); 7   }

18.8 Find the error(s) in the following recursive method, and explain how to correct it (them). This method should find the sum of the values from 0 to n.

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 1   public int sum(int n) 2   { 3      if (n == 0) 4         return 0; 5      else 6         return n + sum(n); 7   }

18.9 (Recursive power Method) Write a recursive method power(base, exponent) that, when called, returns

base ^exponent

For example, power(3,4) = 3 * 3 * 3 * 3. Assume that exponent is an integer greater than or equal to 1. ...