could you create a c$++$ program :

DO NOT use functions, vectors, arrays, or any additional techniques we have not discussed in class.

The user will enter the name of a file that contains a random series of characters $($the one$-$time pad$).$ The user will then choose to encrypt or decrypt a message using that pad. The message is entered and the result is displayed.

The Process

Prompt the user for the filename. The user should enter a local filename.

Which file would you like to use?

Prompt the user for encryption$/$decryption$.$ The user should enter an $"$E$"$ or a $"$D$".$

Would you like to $($E$)$ncrypt or $($D$)$ecrypt$?$

if encrypt

Open the One$-$Time Pad $($OTP$)$ file

Prompt the user for a plain text string to encrypt

Enter the plain text string:

Read the plain text $($PT$)$ string from input

Map next PT character from $[32-126]$ to $[0-94]$

Read character from OTP

Map OTP character from $[32-126]$ to $[0-94]$

Get the cypher text $($CT$)$ character by adding OTP char to the PT char

Modulo the CT back to $[0-94]$ range $($if CT $>94,$ CT $=$ CT $-95)$

Map CT char from $[0-94]$ to $[32-126]$

Display CT char

If there are more PT chars, go back to step $6$

Close OTP file

if decrypt

Open the One$-$Time Pad $($OTP$)$ file

Prompt the user for a cypher text string to decrypt

Enter the cypher text string:

Read the cypher text $($CT$)$ string from input

Map next CT character from $[32-126]$ to $[0-94]$

Read character from OTP

Map OTP character from $[32-126]$ to $[0-94]$

Get the plain text $($PT$)$ character by subtracting OTP char from the CT char

Modulo the PT back to $[0-94]$ range $($PT $<0,$ PT $=$ PT $+95)$

Map PT char from $[0-94]$ to $[32-126]$

Display PT char

If there are more CT chars, go back to step $6$

Close OTP file

Note: You may assume for this project the OTP file and the entered message are well formatted and contain no errors.

Mapping

Moving a value from one range to another, or mapping the value, means to take a value $($x$)$ in one range, $[$inMin $-$ inMax$],$ and calculate the equivalent value $($y$)$ in a new range, $[$outMin $-$ outMax$].$ The formula is

y$=($x$-$inMin$)(($outMax$-$outMin$)/($inMax$-$inMin$))+$outMin

The Example

for encryption

Which file would you like to use? OTPTest.txt Would you like to $($E$)$ncrypt or $($D$)$ecrypt$?$ E Enter the plain text string: Bob is cool $1$kx$\backslash$:Uv$[$K$*$Z

for decryption

Which file would you like to use? OTPTest.txt Would you like to $($E$)$ncrypt or $($D$)$ecrypt$?$ D Enter the cyper text string: $1$kx$\backslash$:Uv$[$K$*$Z Bob is cool