FIX THE LOOP WHEN I TYPE:

$./$a$1$

Please select from the following options:$$

Encrypt $($e$)$

Decrypt $($d$)$

Quit $($q$)$

Choice: e Enter the direction of the shift $($l$/$r$)$: r

Enter the shift number $($integer$)$: $8$

Enter the phrase to encrypt: every day is a sprinkle party

ALSO FIX THE OUTPUT SO IT MATCHES THE EXAMPLES:

Please select from the following options:$$

Encrypt $($e$)$

Decrypt $($d$)$

Quit $($q$)$

Choice: e$$

Enter the direction of the shift $($l$/$r$)$: l$$

Enter the shift number $($integer$)$: $3$

Enter the phrase to encrypt: cats and dogs$$

Result: yqpxykaxaldp

Please select from the following options:$$

Encrypt $($e$)$

Decrypt $($d$)$

Quit $($q$)$

Choice: d$$

Enter the direction of the shift $($l$/$r$)$: l$$

Enter the shift number $($integer$)$: $3$

Enter the phrase to decrypt: yqpxykaxaldp$$

Result: cats and dogs

ENCRYPT.CPP:

#include

#include

#include

#include "encrypt.h$"$

$//$ Function to shift characters$\backslash$

$$

char shift$\_$char$($char c$,$ int shift$)\{$

$$if $($c $>=\text{'}$a$\text{'}$ && c $<=\text{'}$z$\text{'})\{$

$$return static$\_$cast$(\text{'}$a$\text{'}+((($c $-\text{'}$a$\text{'})+$ shift $+26)\%26))$;

$\}$ else if $($c $==\text{'}\text{'})\{$

$$return $\text{'}\text{'}$;

$\}$

$$return c;

$\}$

$//$ Encrypt single char $\backslash$

$$

char encrypt$($char c$,$ int shift$)\{$

$$return shift$\_$char$($c$,$ shift$)$;

$\}$

$//$ Decrypt single char $\backslash$

$$

char decrypt$($char c$,$ int shift$)\{$

$$return shift$\_$char$($c$,-$shift$)$;

$\}$

void process$($char mode, int shift, char dir$)\{$

$$int effective$\_$shift $=($dir $==\text{'}$l$\text{'})?-$shift : shift;

$$std::string phrase;

$$std::cout $<<$ "Enter the phrase to $"<<($mode $==\text{'}$e$\text{'}?$ "encrypt: $"$ : "decryp$\backslash$

t: $")$;

$$std::getline$($std::cin, phrase$)$;

$$std::cout $<<$ "Result: $"$;

$$for $($char c : phrase$)\{$

$$if $($mode $==\text{'}$e$\text{'})\{$

$$std::cout $<<$ encrypt$($c$,$ effective$\_$shift$)$;

$\}$ else $\{$

$$std::cout $<<$ decrypt$($c$,$ effective$\_$shift$)$;

$\}$

$\}$

$$std::cout $<<$ std::endl;

$\}$

$//$ Define and use at least one useful private function$$

$//$ Public functions$$

$//$ Define and implement the functions declared in encrypt.h here.$$

MAIN.CPP:

#include

#include "encrypt.h$"$

#include

using namespace std;

$//$ Function declarations $\backslash$

$$

char main$\_$menu$()$;

void get$\_$opts$($int &shift, char &dir$)$;

$//$ Display the main menu and return the selected option$\backslash$

$$

char main$\_$menu$()\{$

$$char choice;

$$do $\{$

$$std::cout $<<$ "Please select from the following options:

$"$;

$$std::cout $<<$ "Encrypt $($e$)$

Decrypt $($d$)$

Quit $($q$)$

$"$;

$$std::cout $<<$ "Choice: $"$;

$$cin $>>$ choice;

$$if $($choice $!=\text{'}$e$\text{'}$ && choice $!=\text{'}$d$\text{'}$ && choice $!=\text{'}$q$\text{'})\{$

$$ std::cout $<<$ choice $<<"$ is not a valid option, try again.

$"$;