Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Transcribed Image Text:### Understanding Conditional Statements in Python
In this example, we have a task where `car_year` is read from input, and we need to write multiple `if` statements based on different conditions:
- If `car_year` is before 1968, the output is `'Probably has few safety features.'`
- If `car_year` is after 1969, the output is `'Probably has seat belts.'`
- If `car_year` is after 1990, the output is `'Probably has electronic stability control.'`
- If `car_year` is after 2002, the output is `'Probably has airbags.'`
Here is the Python code that solves this:
```python
car_year = int(input())
if car_year < 1968:
print('Probably has few safety features.')
elif car_year > 1969:
print('Probably has seat belts.')
elif car_year > 1990:
print('Probably has electronic stability control.')
elif car_year > 2002:
print('Probably has airbags.')
```
### How It Works:
1. **Input Statement**:
```python
car_year = int(input())
```
- This line takes a year as input and converts it to an integer, storing it in the variable `car_year`.
2. **Conditional Statements**:
- The `if` statement checks if the `car_year` is less than 1968. If true, it prints `'Probably has few safety features.'`.
- The `elif` statements check subsequent conditions in order:
- If `car_year` is greater than 1969, it prints `'Probably has seat belts.'`.
- If `car_year` is greater than 1990, it prints `'Probably has electronic stability control.'`.
- If `car_year` is greater than 2002, it prints `'Probably has airbags.'`.
### Important Notes:
- The statements are checked in sequence. Once a condition is true, the corresponding block of code is executed, and the rest are skipped.
- Ensure proper ordering of conditions to achieve the desired logic flow.
- The use of `elif` (else if) helps streamline multiple conditions in a readable way.
This code snippet is useful to determine potential safety features based on the car's manufacturing year.
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