What will the following program print out:

Question

BlackTom AI · Accepted Answer

Assigning and updating variables: x = 15 sets the variable x to the integer 15.

Relevant concepts:
- Variable assignment stores a value under a name.
- In an assignment like x = x + 5, the right-hand side (RHS) expression is evaluated first using the current value of x, then that result is assigned back to x.
- print(x) outputs the current value of x.

Step-by-step reasoning and intermediate calculations:
1. Line 1: x = 15
   - After execution, x holds the value 15.
2. Line 2: x = x + 5
   - Evaluate the RHS: current x is 15, so compute 15 + 5 = 20.
   - Assign the result to x, so now x holds 20.
3. Line 3: print(x)
   - This prints the current value of x, which is 20.

Why the correct answer is correct:
- The assignment x = x + 5 does not leave x unchanged; it updates x by adding 5 to its current value. Evaluating the RHS gives 20, and that becomes the new x. print(x) therefore prints 20.

Why the other options are incorrect:
- "print x": This would be either a literal string or invalid syntax in Python 3; it does not represent the numeric output 20.
- 5: That would be the added amount, not the final value of x. The program adds 5 to 15, so the result is not 5.
- x+5: That is an expression, not the printed numeric output. After assignment the stored value is 20; the program prints the value, not the expression.
- 15: This is the initial value of x before the update; x is changed to 20 by the second line.

Conclusion: The program prints 20. Final answer: 20.

What will the following program print out:单项选择题

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