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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Write in C++. Need help matching the output below

**Programming Task Instructions**

This task involves writing a complete program with the following steps:

1. **Use a do...while loop to prompt the user for input:**
   - The user must enter a count greater than 1 and less than or equal to 20.
   - If an invalid input is detected (a count less than or equal to 1, or greater than 20), prompt an error message. Ignore the invalid input and continue prompting the user until a valid number is entered.

2. **Display an upside-down triangle using for loops:**
   - Set `amountOfStars` to the number entered from the user's input.
   - Output `amountOfStars` stars, followed by a new line for each iteration.
   - Decrease `amountOfStars` by one after each line.
   - Continue this process until `amountOfStars` is zero, forming an inverted triangle.

3. **Display a right-side-up triangle using while loops:**
   - Initialize `amountOfStars` as 1.
   - Output `amountOfStars` stars, followed by a new line for each iteration.
   - Increase `amountOfStars` by one after each line.
   - Continue this process until `amountOfStars` is equal to the number entered initially by the user.

**Error Handling:**
   - The program should manage situations where a user inputs an invalid character or an out-of-bounds number. In these cases, clear the stream, discard previous invalid inputs, show an error, and re-prompt the user. Ensure valid values are entered before proceeding with the program logic.

**Loop Requirements:**
   - A do...while loop is mandated for obtaining user input.
   - A for loop must be employed for creating the first triangle.
   - A while loop is necessary for forming the second triangle.
   - Adherence to these loop structures is critical for successful completion of the lab task. Failure to comply results in a score of zero for this lab exercise.
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Transcribed Image Text:**Programming Task Instructions** This task involves writing a complete program with the following steps: 1. **Use a do...while loop to prompt the user for input:** - The user must enter a count greater than 1 and less than or equal to 20. - If an invalid input is detected (a count less than or equal to 1, or greater than 20), prompt an error message. Ignore the invalid input and continue prompting the user until a valid number is entered. 2. **Display an upside-down triangle using for loops:** - Set `amountOfStars` to the number entered from the user's input. - Output `amountOfStars` stars, followed by a new line for each iteration. - Decrease `amountOfStars` by one after each line. - Continue this process until `amountOfStars` is zero, forming an inverted triangle. 3. **Display a right-side-up triangle using while loops:** - Initialize `amountOfStars` as 1. - Output `amountOfStars` stars, followed by a new line for each iteration. - Increase `amountOfStars` by one after each line. - Continue this process until `amountOfStars` is equal to the number entered initially by the user. **Error Handling:** - The program should manage situations where a user inputs an invalid character or an out-of-bounds number. In these cases, clear the stream, discard previous invalid inputs, show an error, and re-prompt the user. Ensure valid values are entered before proceeding with the program logic. **Loop Requirements:** - A do...while loop is mandated for obtaining user input. - A for loop must be employed for creating the first triangle. - A while loop is necessary for forming the second triangle. - Adherence to these loop structures is critical for successful completion of the lab task. Failure to comply results in a score of zero for this lab exercise.
### Transcription of Image for Educational Purposes

This text seems to represent a program output that prompts users to enter a count within a specific range. Here's the transcription and explanation:

#### Text Output

```
Enter a count between 2 and 20
**failed

Error: Invalid entry, please retry
Enter a count between 2 and 20
**whoops

Error: Invalid entry, please retry
Enter a count between 2 and 20
**!

Error: Invalid entry, please retry
Enter a count between 2 and 20
**hello

Error: Invalid entry, please retry
Enter a count between 2 and 20
**6

******
*****
****
***
**
*
*
**
***
****
*****
******
```

#### Explanation

The text consists of several prompts and responses:

1. **Prompts and Errors:**
   - The program repeatedly prompts, "Enter a count between 2 and 20".
   - Multiple invalid entries are attempted (e.g., "failed", "whoops", "!", "hello") and generate the error message: "Error: Invalid entry, please retry".

2. **Valid Entry:**
   - A valid entry of `6` is entered.
   - This results in a pattern of asterisks being displayed. The pattern starts with six asterisks and reduces by one asterisk per line until it reaches a single asterisk. Then, it mirrors back up to six asterisks.

#### Diagram Explanation

- **Asterisk Pattern:** The asterisk pattern resembles an inverted pyramid transitioning into an upright pyramid:
  - Descends from `******` to `*` and ascends back to `******`.
  - Demonstrates the program responding to valid input by generating a symmetrical pattern based on the user-entered number.
expand button
Transcribed Image Text:### Transcription of Image for Educational Purposes This text seems to represent a program output that prompts users to enter a count within a specific range. Here's the transcription and explanation: #### Text Output ``` Enter a count between 2 and 20 **failed Error: Invalid entry, please retry Enter a count between 2 and 20 **whoops Error: Invalid entry, please retry Enter a count between 2 and 20 **! Error: Invalid entry, please retry Enter a count between 2 and 20 **hello Error: Invalid entry, please retry Enter a count between 2 and 20 **6 ****** ***** **** *** ** * * ** *** **** ***** ****** ``` #### Explanation The text consists of several prompts and responses: 1. **Prompts and Errors:** - The program repeatedly prompts, "Enter a count between 2 and 20". - Multiple invalid entries are attempted (e.g., "failed", "whoops", "!", "hello") and generate the error message: "Error: Invalid entry, please retry". 2. **Valid Entry:** - A valid entry of `6` is entered. - This results in a pattern of asterisks being displayed. The pattern starts with six asterisks and reduces by one asterisk per line until it reaches a single asterisk. Then, it mirrors back up to six asterisks. #### Diagram Explanation - **Asterisk Pattern:** The asterisk pattern resembles an inverted pyramid transitioning into an upright pyramid: - Descends from `******` to `*` and ascends back to `******`. - Demonstrates the program responding to valid input by generating a symmetrical pattern based on the user-entered number.
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