Write a C++ program that encrypts text. The user will type in a 26 character key from the keyboard. This key is to be used to encrypt text by substituting the first character for an 'A', the second for a 'B', ... and the last in place of a 'Z'.

The first input is the 26 character text.
The second input is a number that indicates how many lines of length 40 will be entered for encryption.

Enter the encryption key: QWErtyuiopLKJHGfdsaZxcvBNM
Enter text to encrypt:  faced zoo
yqetr mgg

-------------------------------------------------------------
Enter the encryption key: QWERTyuIOPLKJHGfdsaZXCVBnm
Enter text to encrypt:  FacEd Zoo
YqeTr Mgg
-------------------------------------------------------------

• You cannot assume that the user will enter all upper case charcters, so convert them as necessary to upper case.
  data validation should use the isupper() function and the toupper() function found in cstdlib

  An uppercase character must be substituted with the corresponding uppercase character of the key.

  You will need to do character arithmetic.

  what is the output of 'Z' - 'A'

  what is the output of 'B' - 'A'

• Run your program three times. Once with each of the following keys:
  1. AbcDefGhijklmnOpqrstuvwxyZ
  2. qwErTyUIOpASDFghjklzxcvBnm
  3. athyuqwevbzxcmklopdfgijnrs
• Enter 8 as the number of lines
• Use the following 8 lines as input:

  LIFE is a multicellular communal
  organism that inhabits the deserts of 
  Flatland. The desert is organized in 
  a square array with each square capable
  of holding one LIFE cell.  LIFE 
  generations mark the passage of time, 
  each generation bringing births and 
  deaths to the LIFE community.