Database System Concepts
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:This image depicts a simple Java program designed to record the number of pizzas sold over several days. Below is a transcription and explanation of the code and output:
### Code Explanation:
1. **Imports**:
- The `Scanner` class is used to take input from the user.
2. **Class and Variables**:
- `NUM_DAYS` is set to 6, which should represent the number of days sales data will be collected for.
- `REV_PIZZA` is a constant that signifies the revenue per pizza, set at 8ドル.50.
- Arrays and counters (`nPizza`, `iWeek`, and `iDay`) are declared to store the number of pizzas sold and track weeks and days.
3. **Main Method**:
- A `Scanner` object named `input` is instantiated to read data from the user.
- The program prompts the user to enter the number of pizzas sold for each day.
4. **For Loop**:
- Iterates over the number of days (`NUM_DAYS`).
- Prompts the user to input the number of pizzas sold for each day (Day 1 to Day 6).
- Validates the input to ensure non-negative values; an error message is displayed if a user enters a negative value.
5. **Output**:
- The program takes input for each day and resets if a negative value is entered.
### Console Output:
- Prompts user to enter the number of pizzas sold for each day.
- In the provided output:
- Day 1: User inputs -1, which is invalid, prompting a message: "Invalid value. Please enter a valid value."
- Days 3 and 5: User inputs -5 and -7, respectively, which also trigger the invalid value message.
- Days 2, 4, 6, and 7: User inputs valid non-negative numbers.
This code demonstrates basic input validation and array usage in Java to manage simple datasets such as daily sales figures.
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