What is the final value of follow after the code segment below is executed?
var follow = 100;
for (var i = 1; i

Question

What is the final value of follow after the code segment below is executed?
var follow = 100;
for (var i = 1; i <= 3; i++){
     follow = follow - 20;
}
for (var i = 1; i <= 5; i++){
      follow = follow + 10;
}

BlackTom AI · Accepted Answer

Each for loop executes its body once for every integer i in the specified inclusive range; the first loop runs 3 times and the second runs 5 times. Knowledge points: for-loop iteration counts, updating a variable repeatedly, and simple arithmetic accumulation.

Start: follow = 100

First for loop: for (i = 1; i <= 3; i++) follow = follow - 20
- Iteration 1 (i=1): follow = 100 - 20 = 80
- Iteration 2 (i=2): follow = 80 - 20 = 60
- Iteration 3 (i=3): follow = 60 - 20 = 40
After first loop: follow = 40 (total change = -20 * 3 = -60)

Second for loop: for (i = 1; i <= 5; i++) follow = follow + 10
- Iteration 1 (i=1): follow = 40 + 10 = 50
- Iteration 2 (i=2): follow = 50 + 10 = 60
- Iteration 3 (i=3): follow = 60 + 10 = 70
- Iteration 4 (i=4): follow = 70 + 10 = 80
- Iteration 5 (i=5): follow = 80 + 10 = 90
After second loop: follow = 90 (total change = +10 * 5 = +50)

Combine changes: Net change = -60 + 50 = -10, so final value = 100 - 10 = 90.

Why the correct answer is 90: the loops deterministically subtract 20 three times and add 10 five times, yielding the step-by-step sums shown above and resulting in 90.

Why other options are incorrect:
- 10: would require a net change of -90 (100 - 90 = 10), which does not match -60 + 50.
- 60: could result from miscounting the first loop as only two subtractions (100 - 40 = 60) or ignoring the second loop; that does not reflect the actual loop bounds.
- 50: does not match the computed net change; it might arise from other incorrect iteration counts but not from the given code.

Final confirmation: the correct final value of follow is 90, matching the provided answer.

What is the final value of follow after the code segment below is executed? var follow = 100; for (var i = 1; i <= 3; i++){ follow = follow - 20; } for (var i = 1; i <= 5; i++){ follow = follow + 10; }单项选择题

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