recursion

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recursion

  1. Consider the following (recursive) static method and draw a recursive tree for 3(a) and 3(b).

public static char mystery(String s, int n, int m) { if (n == 1) return s.charAt(m); char first = mystery(s, n / 2, m * 2); char second = mystery(s, n / 2, m * 2 + 1);

System.out.print(first + " " + second + " ");

return first;

}

a. Give the return value when this method is called with mystery("abc", 2, 0);

b. Give the return value when this method is called with mystery("abcd", 3, 1);

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