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  1. // Diego Martinez                         CSC5            Chapter 10, P.590, #12
  2. /*******************************************************************************
  3. * VALIDATE PASSWORD 
  4. * ______________________________________________________________________________
  5. * This program asks the user to enter a password and verifies that it meets
  6. * the required criteria:
  7. *
  8. *      - At least 6 characters long
  9. *      - Contains at least one uppercase letter
  10. *      - Contains at least one lowercase letter
  11. *      - Contains at least one digit
  12. *
  13. * The program displays messages explaining why the password is invalid if
  14. * it does not meet the requirements.
  15. *
  16. * ______________________________________________________________________________
  17. * INPUT
  18. *
  19. *      User password
  20. *
  21. * OUTPUT
  22. *
  23. *      Validation results for the password
  24. *
  25. *******************************************************************************/
  26.  
  27. #include <iostream>
  28. #include <cstring>
  29. #include <cctype>
  30. using namespace std;
  31.  
  32. // Function prototype
  33. bool verifyPassword(const char *);
  34.  
  35. int main()
  36. {
  37.     // Variable declaration
  38.     char password[100];
  39.  
  40.     // User input
  41.     cout << "Enter a password: ";
  42.     cin.getline(password, 100);
  43.  
  44.     // Verify password
  45.     if (verifyPassword(password))
  46.     {
  47.         cout << "Password is valid." << endl;
  48.     }
  49.     else
  50.     {
  51.         cout << "Password is invalid." << endl;
  52.     }
  53.  
  54.     return 0;
  55. }
  56.  
  57. // Function definition
  58. bool verifyPassword(const char *str)
  59. {
  60.     int length = strlen(str);
  61.  
  62.     bool hasUpper = false;
  63.     bool hasLower = false;
  64.     bool hasDigit = false;
  65.  
  66.     // Check length
  67.     if (length < 6)
  68.     {
  69.         cout << "Password must be at least 6 characters long." << endl;
  70.     }
  71.  
  72.     // Check characters
  73.     for (int i = 0; i < length; i++)
  74.     {
  75.         if (isupper(*(str + i)))
  76.         {
  77.             hasUpper = true;
  78.         }
  79.  
  80.         if (islower(*(str + i)))
  81.         {
  82.             hasLower = true;
  83.         }
  84.  
  85.         if (isdigit(*(str + i)))
  86.         {
  87.             hasDigit = true;
  88.         }
  89.     }
  90.  
  91.     // Display missing requirements
  92.     if (!hasUpper)
  93.     {
  94.         cout << "Password must contain at least one uppercase letter." << endl;
  95.     }
  96.  
  97.     if (!hasLower)
  98.     {
  99.         cout << "Password must contain at least one lowercase letter." << endl;
  100.     }
  101.  
  102.     if (!hasDigit)
  103.     {
  104.         cout << "Password must contain at least one digit." << endl;
  105.     }
  106.  
  107.     // Return result
  108.     if (length >= 6 && hasUpper && hasLower && hasDigit)
  109.     {
  110.         return true;
  111.     }
  112.     else
  113.     {
  114.         return false;
  115.     }
  116. }
Success #stdin #stdout 0s 5316KB
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Enter a password: Password is valid.
https://ideone.com/WIMeDC
VALIDATE PASSWORD Ch.10, P. 590, #12
language:
C++ (gcc 8.3)
created:
23 hours ago
visibility:
public

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