Question

What is the output produced by the following code? int prevprev = 2; int prev = 2; int sum = 0; for (int i = 1; i < 4; i++) { sum = prevprev + prev; System.out.println(prevprev + " " + prev + " " + sum); prevprev = prev; prev = sum; }

Answer 1

The Java code outputs a sequence in the format "prev prev prev sum" for three iterations, producing the lines "2 2 4", "2 4 6", and "4 6 10" on the console.

Step-by-step explanation:

The provided Java code is an example of creating a sequence where each term is the sum of the previous two terms, reminiscent of a Fibonacci sequence, but with different initial values. When we run the code, we can see its output produced on the console through the calls to System.out.println. Let us step through the loop to see the output:

• For i = 1: sum = 2 + 2 = 4, and the output is "2 2 4".
• Then prevprev becomes 2 and prev becomes 4.
• For i = 2: sum = 2 + 4 = 6, and the output is "2 4 6".
• Then prevprev becomes 4 and prev becomes 6.
• For i = 3: sum = 4 + 6 = 10, and the output is "4 6 10".

Therefore, the code prints out a sequence of numbers in the format "prev prev prev sum" three times, corresponding to each iteration of the loop.

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