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What will the foll def foo(a, b): print(a-b) def main(): a=5 b=2 foo(b.a)

What will the foll def foo(a, b): print(a-b) def main(): a=5 b=2 foo(b.a)

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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### Program Analysis **Task: Determine the output of the following Python program when the `main()` function is called.** ### Code: ```python def foo(a, b): print(a - b) def main(): a = 5 b = 2 foo(b, a) main() ``` ### Explanation: 1. **Function Definition `foo(a, b)`:** - This function takes two parameters, `a` and `b`, and prints the result of `a - b`. 2. **Function `main()`:** - Within this function, two variables are defined: - `a` is assigned the value `5`. - `b` is assigned the value `2`. - The function `foo(b, a)` is called with arguments reversed: `foo(2, 5)`. 3. **Function Call `foo(2, 5)`:** - Inside the `foo` function, `a` becomes `2` and `b` becomes `5`. - The calculation `a - b` is performed: `2 - 5`, which equals `-3`. ### Output: The program prints `-3`. ### Answer Choices: - O -7 - O 10 - O -3 - O 3 The correct answer is: **O -3**
Transcribed Image Text:### Program Analysis **Task: Determine the output of the following Python program when the `main()` function is called.** ### Code: ```python def foo(a, b): print(a - b) def main(): a = 5 b = 2 foo(b, a) main() ``` ### Explanation: 1. **Function Definition `foo(a, b)`:** - This function takes two parameters, `a` and `b`, and prints the result of `a - b`. 2. **Function `main()`:** - Within this function, two variables are defined: - `a` is assigned the value `5`. - `b` is assigned the value `2`. - The function `foo(b, a)` is called with arguments reversed: `foo(2, 5)`. 3. **Function Call `foo(2, 5)`:** - Inside the `foo` function, `a` becomes `2` and `b` becomes `5`. - The calculation `a - b` is performed: `2 - 5`, which equals `-3`. ### Output: The program prints `-3`. ### Answer Choices: - O -7 - O 10 - O -3 - O 3 The correct answer is: **O -3**
Expert Solution
Step 1 Explanation

Dear Student,

When foo function is called with values b=2 and a = 5, b-a will be calculated ie 2-5 = -3.

And print function will print this value.

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