What do we use the second parameter of the open() call to indicate? a. How large we expect the file to be. b. What disk drive the file is stored on. C. The list of folders to be searched to find the file we want to open. d. Whether we want to read data from the file or write data to the file.

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
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### Understanding the `open()` Function

The `open()` function is a fundamental component in many programming languages, utilized for file handling. Its primary purpose is to open a file and return a corresponding file object. This function typically accepts multiple parameters, each with a specific purpose.

#### Question:

**What do we use the second parameter of the `open()` call to indicate?**

#### Answer Choices:

- **a.** How large we expect the file to be.
- **b.** What disk drive the file is stored on.
- **c.** The list of folders to be searched to find the file we want to open.
- **d.** Whether we want to read data from the file or write data to the file.

#### Detailed Explanation:

1. **Option a:** This option suggests that the second parameter is used to indicate the expected size of the file. While managing file size is important, the second parameter of the `open()` function is not used for this purpose.

2. **Option b:** This option implies that the second parameter specifies the disk drive location of the file. However, the parameter related to the disk drive or the file path is generally part of the first parameter, not the second.

3. **Option c:** According to this option, the second parameter should list the directories to search for the file. This again is not the correct use of the second parameter in the `open()` function.

4. **Option d:** The correct use of the second parameter in the `open()` function is to specify the mode in which the file should be opened. This includes whether data should be read from or written to the file. For example, common modes include reading (`'r'`), writing (`'w'`), appending (`'a'`), and reading in binary mode (`'rb'`).

Therefore, the correct answer is **d.** Whether we want to read data from the file or write data to the file.
Transcribed Image Text:### Understanding the `open()` Function The `open()` function is a fundamental component in many programming languages, utilized for file handling. Its primary purpose is to open a file and return a corresponding file object. This function typically accepts multiple parameters, each with a specific purpose. #### Question: **What do we use the second parameter of the `open()` call to indicate?** #### Answer Choices: - **a.** How large we expect the file to be. - **b.** What disk drive the file is stored on. - **c.** The list of folders to be searched to find the file we want to open. - **d.** Whether we want to read data from the file or write data to the file. #### Detailed Explanation: 1. **Option a:** This option suggests that the second parameter is used to indicate the expected size of the file. While managing file size is important, the second parameter of the `open()` function is not used for this purpose. 2. **Option b:** This option implies that the second parameter specifies the disk drive location of the file. However, the parameter related to the disk drive or the file path is generally part of the first parameter, not the second. 3. **Option c:** According to this option, the second parameter should list the directories to search for the file. This again is not the correct use of the second parameter in the `open()` function. 4. **Option d:** The correct use of the second parameter in the `open()` function is to specify the mode in which the file should be opened. This includes whether data should be read from or written to the file. For example, common modes include reading (`'r'`), writing (`'w'`), appending (`'a'`), and reading in binary mode (`'rb'`). Therefore, the correct answer is **d.** Whether we want to read data from the file or write data to the file.
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