Write a program in C++ that validates a password according to the following rule

Question

Write a program in C++ that validates a password according to the following rules:

-The password must be at least 8 characters long

-It must contain at least one upper-case letter, one lower-case letter, and one digit.

-It must contain at least one of the following special characters: ~!@#$%^&*()_+=-<>{}[],. (yes, that includes the comma and the period.)

-It must not contain spaces.

The program should loop, requesting user input, until a valid password is entered. For each input, print a message that says the input is either valid or invalid. It should use the “string’ data type, not c-string, and the various functions of that type. You can’t use “cin” for this, so you’ll have to use getline.

Explanation / Answer

# include <iostream>
# include <string>
using namespace std;
class Password{
private:
   static const int SIZE = 80;
   unsigned short password[SIZE];   // used to encrypt password.
   //string password1;
public:
   // constructor one takes an array of characters as an argument.
    Password(char *charArray){
      for (int i = 0; charArray[i] != '' ; i++){
         password[i] = charArray[i] <<1; // bit shift
      }
    }
    // constructor2 takes a string as an argument.
    Password(string charArray){
      for (int i = 0; charArray[i] != '' ; i++){
         password[i] = charArray[i] <<1;   // bit shift
      }    
    }
    // prints password.
    void printPassword(){
      for (int i = 0; password[i] != ''; i++){
        cout << password[i];
      }
    }
};
// Used to measure the string lenght.
int stringLength(char *cArray){
int length = 0;
for (int i = 0; cArray[i] != ''; i++){
   length++;
}
return length;
}
// Overloaded function takes a array of characters.
bool validatePass(char *cArray){
bool upper = false;
bool lower = false;
bool digit = false;
bool special = false;
for(int i =0; cArray[i] != ''; i++){   // Loop through each character of the string and compare requirements.
   if (ispunct(cArray[i])){   // If you find a special character.
      special = true;
   }
   if(isupper(cArray[i])){       // if you find an upper case leeter.
      upper = true;
   }
   if(islower(cArray[i])){       // If you find a lower case letter.
      lower = true;
   }
   if(isdigit(cArray[i])){       // if you find a number.
      digit = true;    
   }    
}
if(!upper){   // if no upper case letter; tell the user.
   cout << "Password requires a uppercase letter!" << endl;
}
if(!lower){   // if no lower case letter; tell the user.
   cout << "Password requires a lowercase letter!" << endl;
}
if(!digit){   // if no number; tell the user.
   cout << "Password requires a number!" << endl;    
}
if(!special){ // if no special character; tell the user.
   cout << "Password requires a special character!" << endl;
}
if(stringLength(cArray) < 8){ // if not long enough; tell the user.
    cout << "Password must be at least 8 characters long!" << endl;
}
if (upper && lower && digit && special && (stringLength(cArray) > 8)){   // if password fulfills the requirement; tell the user and return true.
   cout << "password meets all requirements" << endl;
   return true;
}       
else{   // return false if the password is invalid.
   return false;
}
}
// Overloaded functions takes a string.
bool validatePass(string cArray){
bool upper = false;
bool lower = false;
bool digit = false;
bool special = false;
for(int i =0; cArray[i] != ''; i++){   // Loop through each character of the string and compare requirements.
   if (ispunct(cArray[i])){
      special = true;
   }
   if(isupper(cArray[i])){
      upper = true;
   }
   if(islower(cArray[i])){
      lower = true;
   }
   if(isdigit(cArray[i])){
      digit = true;    
   }    
}
if(!upper){   // if no upper case letter; tell the user.
   cout << "Password requires a uppercase letter!" << endl;
}
if(!lower){   // if no lower case letter; tell the user.
   cout << "Password requires a lowercase letter!" << endl;
}
if(!digit){   // if no number; tell the user.
   cout << "Password requires a number!" << endl;    
}
if(!special){   // if no special character; tell the user.
   cout << "Password requires a special character!" << endl;
}
if(cArray.size() < 8){   // if not long enough; tell the user.
    cout << "Password must be at least 8 characters long!" << endl;
}
if (upper && lower && digit && special && (cArray.size() > 8)){   // if password fulfills the requirement; tell the user and return true.
   cout << "password meets all requirements" << endl;
   return true;
}       
else{   // return false if the password is invalid.
   return false;
}
}

int main(){
const int LENGTH = 80;
char line[LENGTH];   // array of characters.
char choice = ' ';
do{
   cout << "Testing password checker. What data type should the password be? c) c-string, s) string class, q) quit:";
   cin >> choice;
   switch (choice){
      case 'c': {
       bool valPass = false;   // valpass equals false until the password is valid.
        while (!valPass){       // Loop until the password is valid.
        cout << "Enter your password:(0 to Menu)";
        cin >> line;
        if (line[0] == '0'){
          break;
        }
        valPass = validatePass(line);   // function to determine if password is valid.
        }
        if (valPass){
         Password ob(line);  
        }
       //cout << "Password valid." << endl;      
       break;
      }
      case 's': {
        bool valPass2 = false; // valpass2 equals false until the password is valid.
        string password = " ";
        while (!valPass2){   // Loop until password is valid(true).
          cout << "Enter your string password:(0 to Menu)";
          cin >> password;
          if (password[0] == '0'){
             break;
          }
          valPass2 = validatePass(password);   // function to determine if password is valid.
        }
        if(valPass2){
          Password ob2(password);
        }      
       break;
      }
      case 'q': {
       cout << "Thank You goodBye." << endl;
       break;
      }
      default:{
       cout << "Invalid Choice!" << endl;
      }
   }
}while (choice != 'q');
return 0;
}

output

Testing password checker. What data type should the password be? c) c-string, s)
string class, q) quit:c
Enter your password:(0 to Menu)d
Password requires a uppercase letter!
Password requires a number!
Password requires a special character!
Password must be at least 8 characters long!
Enter your password:(0 to Menu)Dj1234&^%
password meets all requirements
Testing password checker. What data type should the password be? c) c-string, s)
string class, q) quit:s
Enter your string password:(0 to Menu)d
Password requires a uppercase letter!
Password requires a number!
Password requires a special character!
Password must be at least 8 characters long!
Enter your string password:(0 to Menu)Dj1234&^%
password meets all requirements
Testing password checker. What data type should the password be? c) c-string, s)
string class, q) quit:q
Thank You goodBye.

--------------------------------
Process exited with return value 0
Press any key to continue . . .

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