
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Question
I have no idea how to complete this C++ assignment

Transcribed Image Text:### Program Explanation
The objective is to write a C++ program named `digits_sum.cpp` that prompts the user to enter a string of single-digit numbers (with no separators), and then calculates the sum of these digits. The program should continue to prompt for new inputs until the user enters zero (i.e., the digit '0').
#### Key Steps:
- Use a **C-string** to handle the input, with a maximum length of 10 characters.
- Ensure each character of the input is a valid digit.
- Use the `isdigit()` function from the `<cctype>` library for digit validation.
- Each valid character is converted to its numerical value by subtracting the character '0'.
- Continue processing until the input '0' is entered.
#### Notes & Hints:
- Allocate a sufficiently large character array to manage input.
- Validate all characters within the input string.
- Example code to convert a character to its integer form:
```cpp
char aDigit = '4';
int aNum;
aNum = aDigit - '0'; // now aNum = 4;
```
- Use the C-string library `<cstring>` to validate input length.
### Sample Output Explained
The output section illustrates various interactions with the `digits_sum.cpp` program:
1. **Input of "2514":**
- Prompt: “Please enter a number (max. length of 10) to sum: 2514”
- Result: “The sum of the digits 2514 is 12”
2. **Input of "1234567890":**
- Prompt: “Please enter a number (max. length of 10) to sum: 1234567890”
- Result: “The sum of the digits 1234567890 is 45”
3. **Input exceeding allowed length:**
- Prompt: “Please enter a number (max. length of 10) to sum: 123456789012”
- Result: “The number exceeds the length of 10”
4. **Invalid input containing non-digit characters:**
- Prompt: “Please enter a number (max. length of 10) to sum: 123ABC”
- Result: “Invalid input: non-digit character detected!”
5. **Termination condition:**
- Prompt: “Please enter a number (max. length of 10) to sum: 0”
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