What will be the final value of count after executing the following code? int count = 0; for(int i = 1; i < 10; i *= 2) { count++; }

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Understand the Problem

The question is asking what the final value of the variable 'count' will be after executing a specified piece of code. The code involves a loop that increments 'count' while manipulating the iteration variable 'i'. The high-level approach is to analyze the loop's iterations and determine how many times 'count' is incremented before 'i' no longer meets the loop condition.

Answer

The final value of `count` is 4.
Answer for screen readers

The final value of count is 4.

Steps to Solve

  1. Initialization of Variables

The variable count is initialized to 0. The loop variable i is initialized to 1.

  1. First Iteration of the Loop
  • Check the condition: $i < 10$, which is $1 < 10$ (true).
  • Increment count: $count = count + 1 = 0 + 1 = 1$.
  • Update i: $i = i \times 2 = 1 \times 2 = 2$.
  1. Second Iteration of the Loop
  • Check the condition: $i < 10$, which is $2 < 10$ (true).
  • Increment count: $count = count + 1 = 1 + 1 = 2$.
  • Update `i$: $i = i \times 2 = 2 \times 2 = 4$.
  1. Third Iteration of the Loop
  • Check the condition: $i < 10$, which is $4 < 10$ (true).
  • Increment `count$: $count = count + 1 = 2 + 1 = 3$.
  • Update `i$: $i = i \times 2 = 4 \times 2 = 8$.
  1. Fourth Iteration of the Loop
  • Check the condition: $i < 10$, which is $8 < 10$ (true).
  • Increment `count$: $count = count + 1 = 3 + 1 = 4$.
  • Update `i$: $i = i \times 2 = 8 \times 2 = 16$.
  1. Fifth Iteration of the Loop
  • Check the condition: $i < 10$, which is $16 < 10$ (false).
  • The loop ends as the condition is no longer satisfied.

The final value of count is 4.

More Information

The loop increments i by multiplying it by 2, starting from 1, and continues as long as i is less than 10. This process illustrates how exponential growth affects the number of loop iterations.

Tips

  • Incorrectly assuming the loop runs indefinitely: The loop condition prevents this, as i grows rapidly and eventually exceeds 10.
  • Miscounting the increments: It's crucial to accurately track each iteration when updating count.

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