What is output?

var x = 10;
if (x 5) {
x = 1;
}

else {
x = 0 ;
}

document.write(x);

Question

What is output?

var x = 10;
if (x > 5) {
       x = 1;
}

else {
         x = 0 ;
}

document.write(x);

BlackTom AI · Accepted Answer

Because x is initially 10 and the relational test x > 5 evaluates to true, the if block runs and sets x to 1.

1) Relevant knowledge points and concepts
- Variable assignment and reassignment in JavaScript (var x = 10 assigns 10; later x = 1 reassigns).
- The conditional if (condition) { ... } else { ... } executes the if block when the condition is true and the else block only when the condition is false.
- The comparison operator > tests whether the left operand is greater than the right and returns a boolean.
- document.write(x) outputs the current value of x to the document.

2) Step-by-step reasoning
- Start: var x = 10; so x has value 10.
- Evaluate the condition: x > 5 → 10 > 5 → true.
- Since the condition is true, execute the code inside the if block: x = 1; This reassigns x from 10 to 1.
- The else block is skipped because the if block executed.
- Finally, document.write(x); writes the current value of x, which is now 1.

3) Intermediate steps shown
- x = 10 (initial)
- Condition check: 10 > 5 → true
- Execute if-body: x = 1
- Skip else-body
- document.write(x) → outputs 1

4) Why the correct answer is correct
Because the condition is true, the if branch runs and reassigns x to 1. The printed output reflects that reassigned value, so the output is 1.

5) Why the other options are incorrect
- "0": would be printed only if the condition were false so the else block ran (x = 0), but here the condition is true, so else is not executed.
- "10": is the initial value but it is overwritten by x = 1 inside the if block, so 10 is not printed.
- "nothing is output": incorrect because document.write(x) does produce output; it prints the current value (1).

6) Conclusion
The correct output is 1, matching the provided answer.

What is output? var x = 10; if (x > 5) { x = 1; } else { x = 0 ; } document.write(x);单项选择题

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