
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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---
**Topic: Boolean Variables and Conditional Strings in C++ Programming**
**Objective:**
Learn how to declare a Boolean variable and use conditional logic to validate string input based on specific criteria.
**Task:**
Declare a Boolean variable named `validPassword`. Use `validPassword` to output "Valid" if `passwordStr` contains at least 4 letters and the length of `passwordStr` is less than or equal to 10. Otherwise, output "Invalid".
**Examples:**
- If the input is `81v4b53Z2Y`, then the output is:
```
Valid
```
- If the input is `wH4q1pK0bL2`, then the output is:
```
Invalid
```
**Note:**
- The `isalpha()` function checks if a character is a letter. It returns true if the character is a letter and false otherwise.
- Example: `isalpha('a')` returns true.
- Example: `isalpha('8')` returns false.
**C++ Code Sample:**
```cpp
#include <iostream>
using namespace std;
int main() {
string passwordStr;
/* Additional variable declarations go here */
getline(cin, passwordStr);
/* Type your additional code here */
if (validPassword) {
cout << "Valid" << endl;
}
else {
cout << "Invalid" << endl;
}
}
```
This code snippet demonstrates how to declare a string variable, take user input, and apply conditional logic to determine if the input meets certain criteria. The placeholder comments indicate where additional code should be added to implement the logic for checking the validity of the password according to the task requirements.
---
This content should help learners understand the concept of Booleans and conditional logic in C++ programming.
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