Question

Class Instructions

You will create a password verification program using C-strings and character testing.

The user will enter a password as a C-string. (Character array). You must test that the password contains at least:

• One lowercase letter
• One uppercase letter
• One number (0-9)
• The password can contain no spaces
• You are to add one more requirement to the password.

I need help in setting this program up.

#include <iostream>

#include <cctype>

using namespace std;

int main() {

char input;

cout << "Enter any character: ";

cin.get(input);

cout << "The character you entered is: " << input << endl;

if (isalpha(input))

cout << "That's an alphabetic character.\n";

if (isdigit(input))

cout << "That's a numeric digit.\n";

if (islower(input))

cout << "The letter you entered is lowercase.\n";

if (isupper(input))

cout << "The letter you entered is uppercase.\n";

if (isspace(input))

cout << "That's a whitespace character.\n";

return 0;

}

Answer 1

#include <iostream>
#include <cctype>
#include <cstring>
using namespace std;
enum PWSIZE //Array Size
{
    PASSWORD_SIZE = 20
};
//Function Prototype
int testNum(char []);
int main()
{
    char password[PASSWORD_SIZE]; //To hold password
    int length;
        int flag=0;
    length = strlen(password);
    cout<< "Please enter a password with at least 6 characters.\n";
    while(1)
    {
        //Get the password.
        do{
                
                        if(flag==0)
                cout << "Enter your password: ";
            else
                cout << "Re-enter your password: ";
            cin.getline(password, PASSWORD_SIZE);
            length = strlen(password);
        }while(length < 6);

        //Call function.
        if(testNum(password))
        {
           cout<<"The entered password is correect pattern.\n" ;
           break;
                }          //if return 1 pass below
        else
        {
                    flag=1;
            continue;
            }
    }
    return 0;
}

int testNum(char pswd[])
{
    int count;
    bool upper_flag = 0, lower_flag = 0, digit_flag = 0,space_flag=1,spcchar_flag=0;
    for (count = 0; count<strlen(pswd); count++)    //don't need to Size use strlen
    {

        if (isupper(pswd[count]))
            upper_flag = 1;
        else if (islower(pswd[count]))
            lower_flag = 1;
        else if (isdigit(pswd[count]))
            digit_flag = 1;
        else if (isspace(pswd[count]))
                space_flag=0;
        else
                spcchar_flag=1;
    }
    if(!upper_flag)
    {
        cout << "The password does not contain an uppercase letter.\n";
    }
    if(!lower_flag)
    {
        cout << "The password does not contain a lowercase letter.\n";
    }
    if(!digit_flag)
    {
        cout << "The password does not contain a digit.\n";
    }
    if(!space_flag)
    {
        cout << "The password does  contain a space.\n";
    }
        if(!spcchar_flag)
    {
        cout << "The password does not contain a special character(like @,%,$,# etc).\n";
    }
    if(upper_flag && lower_flag && digit_flag && space_flag && spcchar_flag)
        return 1;   //if all pass
    else
        return 0;
}

OUTPUT:-

Please enter a password with at least 6 characters.
Enter your password: sdas@1997
The password does not contain an uppercase letter.
Re-enter your password: sdas 1@997
The password does not contain an uppercase letter.
The password does contain a space.
Re-enter your password: Sdas@1997
The entered password is correect pattern.