Read in a 2-character string from input into variable passwordStr. Declare a boolean variable isValid and set isValid to true if the following conditions are met: • passwordStr does not contain two of the same character. • For alphabetic characters, passwordStr does not contain two of the same letter (regardless of case). Otherwise, set isValid to false.
Read in a 2-character string from input into variable passwordStr. Declare a boolean variable isValid and set isValid to true if the following conditions are met: • passwordStr does not contain two of the same character. • For alphabetic characters, passwordStr does not contain two of the same letter (regardless of case). Otherwise, set isValid to false.
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
Problem 1PE
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Transcribed Image Text:**Challenge Activity: Character Operations (3.15.1)**
**Objective:**
Create a program to validate a 2-character string input. The variable `isValid` is set to true if:
- `passwordStr` does not contain two of the same character.
- For alphabetic characters, `passwordStr` does not contain two of the same letter (ignoring case).
Otherwise, `isValid` is set to false.
**Examples:**
- If the input is `5c`, `isValid` is `true`, output:
`Valid password`
- If the input is `pp`, `isValid` is `false`, output:
`Invalid password`
**Instructions:**
Use `getline(cin, passwordStr)` to read the input into `passwordStr`.
**C++ Code:**
```cpp
#include <iostream>
#include <string>
#include <cctype>
using namespace std;
int main() {
string passwordStr;
getline(cin, passwordStr);
bool isValid = true;
if (toupper(passwordStr.at(0)) == toupper(passwordStr.at(1))) {
isValid = false;
}
if (isValid) {
cout << "Valid password" << endl;
} else {
cout << "Invalid password" << endl;
}
return 0;
}
```
**Testing and Results:**
- **Test Input:** `5c`
- **Your Output:** `Invalid password`
- **Expected Output:** `Valid password`
**Explanation:**
The `toupper()` function is used to convert characters to uppercase for comparison, ensuring case insensitivity. Adjustments are needed to ensure the code outputs the correct responses for all conditions.
**Notes:**
- Not all tests passed, indicating a need for reviewing the logic concerning the comparisons. The code must accurately differentiate between valid and invalid inputs considering the objective criteria.
Transcribed Image Text:## Password Validation Using C++
The code snippet provided is part of a program that validates passwords based on certain criteria.
```cpp
if (isValid) {
cout << "Valid password" << endl;
}
else {
cout << "Invalid password" << endl;
}
return 0;
```
### Explanation
This segment of code uses a conditional statement to print `"Valid password"` if the `isValid` variable is `true`, and `"Invalid password"` otherwise. The program concludes by returning `0`.
### Instruction Details
To check if `passwordStr` does not contain two instances of the same character regardless of case, the `toupper()` function is utilized. This function converts both characters to their uppercase versions before checking them for equality. The `tolower()` function can also be employed for the same purpose.
### Error Notification
Not all tests passed successfully.
### Specific Test Case: Compare Output
1. **Input Tested:** `5&`
2. **Result Observed:** The program outputted `"Invalid password"`.
3. **Expected Outcome:** The correct output should be `"Valid password"`.
The discrepancy indicates that the program has not met the expected criteria for validation in this test case. This highlights an area for debugging to ensure the functions perform as intended under different inputs.
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