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GATE | GATE-CS-2015 (Set 3) | Question 49

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Consider the following recursive JAVA function. If get(6) function is being called in main() then how many times will the get() function be invoked before returning to the main()? 

Java




static void get (int n){
  if (n < 1)
    return;
  get(n - 1);
  get(n - 3);
  System.out.print(n);
}


(A)

15

(B)

25

(C)

35

(D)

45



Answer: (B)

Explanation:

                              get(6) [25 Calls]
                              /      \\
               [17 Calls] get(5)       get(3) [7 Calls]
                        /     \\
                    get(4)    get(2)[5 Calls]
                   /    \\ 
     [7 Calls] get(3)  get(1)[3 Calls]
                /     \\
             get(2)   get(0)
            /    \\
[3 Calls]get(1)  get(-1) 
   /  \\
get(0) get(-2)

Hence Option (B) is the correct answer.


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Last Updated : 28 Jun, 2021
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