Write a program that take a choice to calculate and printthese requirements by using functions for each point.Main Menu:a$.$ Count characters, change text numbers to integersand converts small character to capital.b$.$ Seriesc. Sum Perfects, Max Digits and Average Number.d$.$ Binary and Decimale. ExitIn menu $($a$)1.$ count characters: insert string input and then calculatethe numbers of character r$,$ t $,$ y until $($q$)$Enter Your LettersratatihgyOutput:r t y$1212.$ change text to numbers to integers:enter your text number until $($q$)$input: a$1$b$2$cv$4$x$23$qoutput: $124233.$ converts small character to capital: a $->$ A$4.$ Return to main menu.In menu $($b$)1.$ series $1->$ sin$($x$)=$ x $-$ x$3/3!+$ x$5/5!-$ x$7/7!$ xn$/$n$!$

$2.$ series $2->$ cos$($x$)=1-$ x$2/2!+$ x$4/4!-$ x$6/6!$ xn$/$n$!$

$3.$ series $3->$ F$2=1+$ x$1/($x$-1)2+$ x$2/($ x$-1)3+$ x$3/($ x$-1)4+$ xn$/($ x$-1)$n$+1$xn$/$n$!\mathrm{.}4.$ Return to main menu.In menu $($c$)1.$ Sum perfect numbers : perfect number, a positiveinteger that is equal to the sum of its proper divisors.The smallest perfect number is $6,$ which is the sum of$1,2,$ and $3.$ Other perfect numbers are $28,496,$ and$8,128.->$ the program must print perfect numbersless than given input and print the summation ofperfect numbers$2.$ Max Odd Digit: $7592->$The Maximum odd Digit is $93.$ Average Prime numbers: the program must print theaverage of prime numbers from $1$ to given input$\mathrm{.}4.$ Return to main menuIn menu $($d$)1.$ Binary to decimal. $(1010)->102.$ Decimal to binary. $(10)->1010$

Write the code by using c$++$language