$//$ FILE: sequence$\_$test.cxx$//$ An interactive test program for the new sequence class#include $//$ Provides toupper#include $//$ Provides cout and cin#include $//$ Provides EXIT$\_$SUCCESS#include "sequence$1.$h$"//$ With value$\_$type defined as doubleusing namespace std;using namespace main$\_$savitch$\_3$;$//$ PROTOTYPES for functions used by this test program:void print$\_$menu$()$;$//$ Postcondition: A menu of choices for this program has been written to cout.char get$\_$user$\_$command$()$;$//$ Postcondition: The user has been prompted to enter a one character command.$//$ The next character has been read $($skipping blanks and newline characters$),//$ and this character has been returned.void show$\_$sequence$($sequence display$)$;$//$ Postcondition: The items on display have been printed to cout $($one per line$).$double get$\_$number$()$;$//$ Postcondition: The user has been prompted to enter a real number. The$//$ number has been read, echoed to the screen, and returned by the function.int main$()\{$ sequence test; $//$ A sequence that well perform tests on char choice; $//$ A command character entered by the user cout $<<$ "I have initialized an empty sequence of real numbers." $<<$ endl; do $\{$ print$\_$menu$()$; choice $=$ toupper$($get$\_$user$\_$command$())$; switch $($choice$)\{$ case $\text{'}!\text{'}$: test.start$()$; break; case $\text{'}+\text{'}$: test.advance$()$; break; case $\text{'}?\text{'}$: if $($test$.$is$\_$item$())$ cout $<<$ "There is an item." $<<$ endl; else cout $<<$ "There is no current item." $<<$ endl; break; case $\text{'}$C$\text{'}$: if $($test$.$is$\_$item$())$ cout $<<$ "Current item is: $"<<$ test.current$()<<$ endl; else cout $<<$ "There is no current item." $<<$ endl; break; case $\text{'}$P$\text{'}$: show$\_$sequence$($test$)$; break; case $\text{'}$S$\text{'}$: cout $<<$ "Size is $"<<$ test.size$()<<\text{'}.\text{'}<<$ endl; break; case $\text{'}$I$\text{'}$: test.insert$($get$\_$number$())$; break; case $\text{'}$A$\text{'}$: test.attach$($get$\_$number$())$; break; case $\text{'}$R$\text{'}$: test.remove$\_$current$()$; cout $<<$ "The current item has been removed." $<<$ endl; break; case $\text{'}$Q$\text{'}$: cout $<<$ "Ridicule is the best test of truth." $<<$ endl; break; default: cout $<<$ choice $<<"$ is invalid." $<<$ endl; $\}\}$ while $(($choice $!=\text{'}$Q$\text{'}))$; return EXIT$\_$SUCCESS;$\}$void print$\_$menu$()//$ Library facilities used: iostream.h$\{$ cout $<<$ endl; $//$ Print blank line before the menu cout $<<$ "The following choices are available: $"<<$ endl; cout $<<"!$ Activate the start$()$ function" $<<$ endl; cout $<<"+$ Activate the advance$()$ function" $<<$ endl; cout $<<"?$ Print the result from the is$\_$item$()$ function" $<<$ endl; cout $<<"$ C Print the result from the current$()$ function" $<<$ endl; cout $<<"$ P Print a copy of the entire sequence" $<<$ endl; cout $<<"$ S Print the result from the size$()$ function" $<<$ endl; cout $<<"$ I Insert a new number with the insert$(...)$ function" $<<$ endl; cout $<<"$ A Attach a new number with the attach$(...)$ function" $<<$ endl; cout $<<"$ R Activate the remove$\_$current$()$ function" $<<$ endl; cout $<<"$ Q Quit this test program" $<<$ endl;$\}$char get$\_$user$\_$command$()//$ Library facilities used: iostream$\{$ char command; cout $<<$ "Enter choice: $"$; cin $>>$ command; $//$ Input of characters skips blanks and newline character return command;$\}$void show$\_$sequence$($sequence display$)//$ Library facilities used: iostream$\{$ for $($display$.$start$()$; display.is$\_$item$()$; display.advance$())$ cout $<<$ display.current$()<<$ endl;$\}$double get$\_$number$()//$ Library facilities used: iostream$\{$ double result; cout $<<$ "Please enter a real number for the sequence: $"$; cin $>>$ result; cout $<<$ result $<<"$ has been read." $<<$ endl; return result;$\}$