Question1.18 What is the printout of the code below? a = '5'a = a + '0'b = int(a) / 2print(b - 5) Select one alternative: 2.5 0 20.0 Error ResetMaximum marks: 2单项选择题
A
2.5
B
0
C
20.0
D
Error

Question

Question1.18 What is the printout of the code below? a = '5'a = a + '0'b = int(a) / 2print(b - 5) Select one alternative: 2.5 0  20.0 Error ResetMaximum marks: 2

BlackTom AI · Accepted Answer

String '5' concatenated with '0' yields '50', so the code produces a numeric result based on that value.

1. Relevant knowledge points and concepts
- String concatenation: in Python, using + between two strings joins them (e.g., '5' + '0' -> '50').
- int() conversion: int('50') converts the string '50' to the integer 50.
- Division in Python 3: the / operator performs floating-point (true) division, so 50 / 2 -> 25.0 (a float).
- Arithmetic with floats: subtracting an integer from a float yields a float result (25.0 - 5 -> 20.0).

2. Step-by-step reasoning with all intermediate steps
- Initial: a = '5' (a is the string "5").
- After concatenation: a = a + '0' -> a becomes '50' (string).
- Conversion and division: b = int(a) / 2
  - int(a) = int('50') = 50 (integer).
  - 50 / 2 = 25.0 (float, because / returns float in Python 3).
  - So b = 25.0.
- Final print: print(b - 5)
  - b - 5 = 25.0 - 5 = 20.0
  - The printed output is 20.0.

3. Calculations shown explicitly
- int('50') = 50
- 50 / 2 = 25.0
- 25.0 - 5 = 20.0

4. Why the correct answer is correct
Because string concatenation produces '50', converting to int gives 50, dividing by 2 gives the floating-point 25.0, and subtracting 5 yields the floating-point 20.0. The print statement therefore outputs 20.0.

5. Why the other options are incorrect
- 2.5: would correspond to 5 / 2, not 50 / 2; it ignores the concatenation step.
- 0: no sequence of the given operations produces 0.
- Error: no error occurs because '50' is a valid numeric string for int(); conversion succeeds and division by 2 is valid.

6. Conclusion
The program prints 20.0, which matches the provided correct answer: 20.0.

Question1.18 What is the printout of the code below? a = '5'a = a + '0'b = int(a) / 2print(b - 5) Select one alternative: 2.5 0 20.0 Error ResetMaximum marks: 2单项选择题

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