Help with Cipher HW

[suddlemercury]

My professor wants us to make a cipher program with in todays. the catch is is that she did not teach us anything about ciphers or how to make them. I feel like ive been tossed into a lion cage help me please :)!

Password Vowels
Substitute Number A a 4 E e 3 I i 1 O o 0 *U u 7
(*As no numbers closely resemble U, just use 7 since it is just above U on the keyboard

intstuctions here

You are required to use “C-Strings” for this assignment. We will further discuss CStrings later in Chapter 12, but you can find an introduction to them in Sections 3.8 and 3.9 of our textbook. A C-String is simply an array of characters like in this example: char word[SIZE];
where word is an array of the char data type with a max length of SIZE. A significant detail, however, in using C-strings is the “null terminating charater”. This character (represented by ‘\0’in a program) is not visible but is used to mark the end of a C-String. You will need to use this to determine when you have reached the end of your password.
In order to receive full credit for this assignment, you must:
1. (5 points) Use a C-string to get the password from the user and complete steps 2 – 4 below in the program. 2. (5 points) Determine how long the password is 3. (5 points) Check every character of the array for a vowel (from the table above). 4. (5 points) Replace all vowels with the substitute number given in the table and then display the newly changed password to the user.

[Duthomhas]

You have presumably studied arrays and basic flow control constructs, which is sufficient for your homework.

What you are being asked to do is transform a piece of text (stored in an array) using a 'substitution cipher' -- replacing one character for another.

Your transform table looks like this:
    'A' → '4'
    'a' → '4'
    'E' → '3'
    'e' → '3'
 
etc.

So you get a 'password' (any text) from the user:

    password? Open Sesame  

And then your program will take that text "Open Sesame" and replace some of the letters according to the table:

    new password: 0p3n S3s4m3  


Remember, C-strings are just arrays of characters, where the last character is '\0' (which is just a zero) -- indicating the end of the string. The zero is not counted as part of the text and it is not displayed. You can read more about C-strings in your textbook. Additional reading can be found here:
http://www.cplusplus.com/faq/sequences/strings/c-strings-and-pointers/#c-strings

To get a C-string from the user, you need to use a special member function in cin:

int main()
{
  constexpr int SIZE = 100;  // maximum length of a password, minus one (for the '\0')
  char users_password[SIZE];

  cout << "password? ";
  cin.getline( users_password, SIZE );

  ...

Hope this helps.