CBSE 2025, Compartment, Set 4

Question

Write the output on execution of the following Python code :

```python
def ALTER(Y=25):
    global X
    Y += X
    X += Y
    print(X, Y, sep="#")

X = 5; Y = 15
ALTER(Y)
ALTER()
print(X, Y, sep="@")
```

Edvaya · Accepted Answer

The correct answer is Subjective. **Output:** ``` 25#20 75#50 75@15 ``` **Explanation:** 1. Global variables initialized: `X = 5`, `Y = 15`. 2. First call `ALTER(Y)`: Function receives `Y = 15`. - `global X` binds the local `X` to the global `X` (value 5). - `Y += X` -> `Y = 15 + 5 = 20`. (Local `Y` becomes 20). - `X += Y` -> `X = 5 + 20 = 25`. (Global `X` becomes 25). - `print(X, Y, sep="#")` prints `25#20`. 3. Second call `ALTER()`: Function uses default parameter `Y = 25`. - `global X` retrieves the updated global `X` (value 25). - `Y += X` -> `Y = 25 + 25 = 50`. - `X += Y` -> `X = 25 + 50 = 75`. (Global `X` becomes 75). - `print(X, Y, sep="#")` prints `75#50`. 4. Finally, `print(X, Y, sep="@")` executes in the global scope. Global `X` is now 75. Global `Y` has remained unchanged at 15. - It prints `75@15`.

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Computer Science > Computational Thinking And Programming 2 > Functions

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