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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[画像: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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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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