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Revision as of 06:35, 17 July 2011
You are encouraged to solve this task according to the task description, using any language you may know.
Given a list containing a number of strings of which one is to be selected and a prompt string, create a function that:
- Print a textual menu formatted as an index value followed by its corresponding string for each item in the list.
- Prompt the user to enter a number.
- Return the string corresponding to the index number.
The function should reject input that is not an integer or is an out of range integer index by recreating the whole menu before asking again for a number. The function should return an empty string if called with an empty list.
For test purposes use the four phrases: “fee fie”, “huff and puff”, “mirror mirror” and “tick tock” in a list.
Note: This task is fashioned after the action of the Bash select statement.
Ada
<lang Ada> -- menu2.adb -- -- rosetta.org menu example -- GPS 4.3-5 (Debian)
-- note: the use of Unbounded strings is somewhat overkill, except that -- it allows Ada to handle variable length string data easily -- ie: differing length menu items text with Ada.Text_IO, Ada.Integer_Text_IO, Ada.Strings.Unbounded,
Ada.Strings.Unbounded.Text_IO;
use Ada.Text_IO, Ada.Integer_Text_IO,
Ada.Strings.Unbounded, Ada.Strings.Unbounded.Text_IO;
procedure menu2 is
package tio renames Ada.Integer_Text_IO; -- rename package to use a shorter name, tio, as integer get prefix menu_item : array (1..4) of Unbounded_String; -- 4 menu items of any length choice : integer := 0; -- user selection entry value
procedure show_menu is
-- display the menu options and collect the users input -- into locally global variable 'choice'
begin for pntr in menu_item'first .. menu_item'last loop put (pntr ); put(" "); put( menu_item(pntr)); new_line; end loop; put("chose (0 to exit) #:"); tio.get(choice); end show_menu;
-- main program -- begin
menu_item(1) := to_unbounded_string("Fee Fie"); menu_item(2) := to_unbounded_string("Huff & Puff"); menu_item(3) := to_unbounded_string("mirror mirror"); menu_item(4) := to_unbounded_string("tick tock"); -- setup menu selection strings in an array show_menu;
loop if choice in menu_item'range then put("you chose #:"); case choice is -- in a real menu, each case would execute appropriate user procedures when 1 => put ( menu_item(choice)); new_line; when 2 => put ( menu_item(choice)); new_line; when 3 => put ( menu_item(choice)); new_line; when 4 => put ( menu_item(choice)); new_line; when others => null; end case; show_menu; else put("Menu selection out of range"); new_line; if choice = 0 then exit; end if; -- need a exit option ! show_menu; end if; end loop;
end menu2;
</lang>
<lang Ada> ./menu2
1 Fee Fie 2 Huff & Puff 3 mirror mirror 4 tick tock
chose (0 to exit) #:2 you chose #:Huff & Puff
1 Fee Fie 2 Huff & Puff 3 mirror mirror 4 tick tock
chose (0 to exit) #:55 Menu selection out of range
1 Fee Fie 2 Huff & Puff 3 mirror mirror 4 tick tock
chose (0 to exit) #:0 Menu selection out of range [2010-06-09 22:18:25] process terminated successfully (elapsed time: 15.27s)
</lang>
ALGOL 68
<lang algol68>PROC menu select := (FLEX[]STRING items, UNION(STRING, VOID) prompt)STRING: (
INT choice; IF LWB items <= UPB items THEN WHILE FOR i FROM LWB items TO UPB items DO printf(($g(0)") "gl$, i, items[i])) OD; CASE prompt IN (STRING prompt):printf(($g" "$, prompt)), (VOID):printf($"Choice ? "$) ESAC; read((choice, new line)); # WHILE # 1 > choice OR choice > UPB items DO SKIP OD; items[choice] ELSE "" FI
);
test:(
FLEX[0]STRING items := ("fee fie", "huff and puff", "mirror mirror", "tick tock"); STRING prompt := "Which is from the three pigs : ";
printf(($"You chose "g"."l$, menu select(items, prompt)))
)</lang> Output:
1) fee fie 2) huff and puff 3) mirror mirror 4) tick tock Which is from the three pigs : 2 You chose huff and puff.
AutoHotkey
<lang autohotkey>GoSub, CreateGUI return
Submit: Gui, Submit, NoHide If Input =
GuiControl,,Output
Else If Input not between 1 and 4 {
Gui, Destroy Sleep, 500 GoSub, CreateGUI
} Else {
GuiControlGet, string,,Text%Input% GuiControl,,Output,% SubStr(string,4)
} return
CreateGUI: list = fee fie,huff and puff,mirror mirror,tick tock Loop, Parse, list, `,
Gui, Add, Text, vText%A_Index%, %A_Index%: %A_LoopField%
Gui, Add, Text, ym, Which is from the three pigs? Gui, Add, Edit, vInput gSubmit Gui, Add, Edit, vOutput Gui, Show return
GuiClose: ExitApp</lang>
BASIC
<lang qbasic> function sel$(choices$(), prompt$)
if ubound(choices$) - lbound(choices$) = 0 then sel$ = "" ret$ = "" do for i = lbound(choices$) to ubound(choices$) print i; ": "; choices$(i) next i input ;prompt$, index if index <= ubound(choices$) and index >= lbound(choices$) then ret$ = choices$(index) while ret$ = "" sel$ = ret$
end function</lang>
Brat
<lang brat>menu = { prompt, choices |
true? choices.empty? { "" } { choices.each_with_index { c, i | p "#{i}. #{c}" }
selection = ask prompt
true? selection.numeric? { selection = selection.to_i true? selection < 0 || { selection >= choices.length } { p "Selection is out of range"; menu prompt, choices } { choices[selection] } } { p "Selection must be a number"; menu prompt, choices } }
}
p menu "Selection: " ["fee fie" "huff and puff" "mirror mirror" "tick tock"]</lang>
C
<lang c>#include <stdio.h>
- include <stdlib.h>
- include <string.h>
char *menu_select(char **items, char *prompt);
int main(void) { char *items[] = {"fee fie", "huff and puff", "mirror mirror", "tick tock", NULL}; char *prompt = "Which is from the three pigs?";
printf("You chose %s.\n", menu_select(items, prompt));
return EXIT_SUCCESS; }
char * menu_select(char **items, char *prompt) { char buf[BUFSIZ]; int i; int choice; int choice_max;
if (items == NULL) return NULL;
do { for (i = 0; items[i] != NULL; i++) { printf("%d) %s\n", i + 1, items[i]); } choice_max = i; if (prompt != NULL) printf("%s ", prompt); else printf("Choice? "); if (fgets(buf, sizeof(buf), stdin) != NULL) { choice = atoi(buf); } } while (1 > choice || choice > choice_max);
return items[choice - 1]; }</lang>
C++
<lang cpp>#include <iostream>
- include <boost/regex.hpp>
- include <cstdlib>
- include <string>
using namespace std;
void printMenu(const string *, int); //checks whether entered data is in required range bool checkEntry(string, const string *, int);
string dataEntry(string prompt, const string *terms, int size) {
if (size == 0) { //we return an empty string when we call the function with an empty list return ""; } string entry; do { printMenu(terms, size); cout << prompt; cin >> entry; } while( !checkEntry(entry, terms, size) ); int number = atoi(entry.c_str()); return terms[number - 1];
}
void printMenu(const string *terms, int num) {
for (int i = 1 ; i < num + 1 ; i++) { cout << i << ')' << terms[ i - 1 ] << '\n'; }
}
bool checkEntry(string myEntry, const string *terms, int num) {
boost::regex e("^\\d+$"); if (!boost::regex_match(myEntry, e)) return false; int number = atoi(myEntry.c_str()); if (number < 1 || number > num) return false; return true;
}
int main( ) {
const string terms[ ] = { "fee fie" , "huff and puff" , "mirror mirror" , "tick tock" }; int size = sizeof terms / sizeof *terms; cout << "You chose: " << dataEntry("Which is from the three pigs: ", terms, size); return 0;
}</lang>
C#
<lang csharp>
static void Main(string[] args) { List<string> menu_items = new List<string>() { "fee fie", "huff and puff", "mirror mirror", "tick tock" }; //List<string> menu_items = new List<string>(); Console.WriteLine(PrintMenu(menu_items)); Console.ReadLine(); } private static string PrintMenu(List<string> items) { if (items.Count == 0) return "";
string input = ""; int i = -1; do { for (int j = 0; j < items.Count; j++) Console.WriteLine("{0}) {1}", j, items[j]);
Console.WriteLine("What number?"); input = Console.ReadLine();
} while (!int.TryParse(input, out i) || i >= items.Count || i < 0); return items[i]; }
</lang>
Clojure
<lang clojure>(defn menu [prompt choices]
(if (empty? choices) "" (let [menutxt (apply str (interleave (iterate inc 1) (map #(str \space % \newline) choices)))] (println menutxt) (print prompt) (flush) (let [index (read-string (read-line))] ; verify (if (or (not (integer? index)) (> index (count choices)) (< index 1)) ; try again (recur prompt choices) ; ok (nth choices (dec index)))))))
(println "You chose: "
(menu "Which is from the three pigs: " ["fee fie" "huff and puff" "mirror mirror" "tick tock"]))</lang>
Common Lisp
<lang lisp>(defun select (prompt choices)
(if (null choices) "" (do (n) ((and n (<= 0 n (1- (length choices)))) (nth n choices)) (format t "~&~a~%" prompt) (loop for n from 0 for c in choices do (format t " ~d) ~a~%" n c)) (force-output) (setf n (parse-integer (read-line *standard-input* nil) :junk-allowed t)))))</lang>
D
<lang d>import std.stdio; import std.conv; import std.string; void main() {
char[][]items = ["fee fie","huff and puff","mirror mirror","tick tock"]; writefln("You chose %s",doSelect(items));
}
char[]doSelect(char[][]input) {
if (!input.length) return ""; char[]line; int choice; do { writefln("Choose one:"); foreach(i,item;input) { writefln("%d) %s",i,item); } writef("> "); line = readln(); line = chomp(line); choice = ValidChoice(input.length-1,line); } while (choice == -1); // we have a valid choice return input[choice];
}
int ValidChoice(int max,char[]input) {
int tmp; try tmp = toInt(input); catch(Error e) return -1; if (tmp <= max && tmp >= 0) { return tmp; } return -1;
}</lang>
Euphoria
<lang euphoria>include get.e
function menu_select(sequence items, object prompt)
if length(items) = 0 then return "" else for i = 1 to length(items) do printf(1,"%d) %s\n",{i,items[i]}) end for if atom(prompt) then prompt = "Choice?" end if return items[prompt_number(prompt,{1,length(items)})] end if
end function
constant items = {"fee fie", "huff and puff", "mirror mirror", "tick tock"} constant prompt = "Which is from the three pigs? "
printf(1,"You chose %s.\n",{menu_select(items,prompt)})</lang>
Factor
<lang factor>USE: formatting
- print-menu ( seq -- )
[ 1 + swap "%d - %s\n" printf ] each-index "Your choice? " write flush ;
- select ( seq -- result )
dup print-menu readln string>number [ 1 - swap 2dup bounds-check? [ nth ] [ nip select ] if ] [ select ] if* ;</lang>
Example usage:
( scratchpad ) { "fee fie" "huff and puff" "mirror mirror" "tick tock" } select 1 - fee fie 2 - huff and puff 3 - mirror mirror 4 - tick tock Your choice? 1 --- Data stack: "fee fie"
Fantom
<lang fantom>class Main {
static Void displayList (Str[] items) { items.each |Str item, Int index| { echo ("$index: $item") } }
public static Str getChoice (Str[] items) { selection := -1 while (selection == -1) { displayList (items) Env.cur.out.print ("Select: ").flush input := Int.fromStr(Env.cur.in.readLine, 10, false) if (input != null) { if (input >= 0 && input < items.size) { selection = input } } echo ("Try again") } return items[selection] }
public static Void main () { choice := getChoice (["fee fie", "huff and puff", "mirror mirror", "tick tock"]) echo ("You chose: $choice") }
}</lang>
Go
<lang go>package main
import "fmt"
var choices = []string{
"fee fie", "huff and puff", "mirror mirror", "tick tock",
}
func menu(choices []string) string {
if len(choices) == 0 { return "" } var c int for { fmt.Println("") for i, s := range choices { fmt.Printf("%d. %s\n", i+1, s) } fmt.Print("Enter number: ") _, err := fmt.Scanln(&c)
if err == nil && c > 0 && c <= len(choices) { break } } return choices[c-1]
}
func main() {
fmt.Println(menu(choices))
}</lang>
Haskell
<lang Haskell>module RosettaSelect where
import Data.Maybe (listToMaybe) import Control.Monad (guard)
select :: [String] -> IO String select [] = return "" select menu = do
putStr $ showMenu menu putStr "Choose an item: " choice <- getLine maybe (select menu) return $ choose menu choice
showMenu :: [String] -> String showMenu menu = unlines [show n ++ ") " ++ item | (n, item) <- zip [1..] menu]
choose :: [String] -> String -> Maybe String choose menu choice = do
n <- maybeRead choice guard $ n > 0 listToMaybe $ drop (n-1) menu
maybeRead :: Read a => String -> Maybe a maybeRead = fmap fst . listToMaybe . filter (null . snd) . reads</lang>
Example usage, at the GHCI prompt: <lang Haskell>*RosettaSelect> select ["fee fie", "huff and puff", "mirror mirror", "tick tock"] 1) fee fie 2) huff and puff 3) mirror mirror 4) tick tock Choose an item: 3 "mirror mirror"
- RosettaSelect></lang>
HicEst
<lang HicEst>CHARACTER list = "fee fie,huff and puff,mirror mirror,tick tock,", answer*20
POP(Menu=list, SelTxt=answer)
SUBROUTINE list ! callback procedure must have same name as menu argument
! Subroutine with no arguments: all objects are global ! The global variable $$ returns the selected list index WRITE(Messagebox, Name) answer, $$
END</lang>
Icon and Unicon
<lang Icon>procedure main()
L := ["fee fie", "huff and puff", "mirror mirror", "tick tock"]
every i := 1 to *L do
write(i,") ",L[i])
repeat {
writes("Choose a number from the menu above: ") a := read() if 1 <= integer(a) <= i then break }
write("You selected ",a," ==> ",L[a]) end</lang>
J
Solution: <lang j>require'misc' showMenu =: i.@# smoutput@,&":&> ' '&,&.> makeMsg =: 'Choose a number 0..' , ': ',~ ":@<:@# errorMsg =: [ smoutput bind 'Please choose a valid number!'
select=: ({::~ _&".@prompt@(makeMsg [ showMenu)) :: ($:@errorMsg)</lang> See Talk page for explanation of code.
Example use: <lang j> select 'fee fie'; 'huff and puff'; 'mirror mirror'; 'tick tock'</lang>
This would display:
0 fee fie 1 huff and puff 2 mirror mirror 3 tick tock choose a number 0..3:
And, if the user responded with 2, would return: mirror mirror
Java
<lang java5>public static String select(List<String> list, String prompt){
if(list.size() == 0) return ""; Scanner sc = new Scanner(System.in); String ret = null; do{ for(int i=0;i<list.size();i++){ System.out.println(i + ": "+list.get(i)); } System.out.print(prompt); int index = sc.nextInt(); if(index >= 0 && index < list.size()){ ret = list.get(index); } }while(ret == null); return ret;
}</lang>
JavaScript
for the I/O.
<lang javascript>function select(question, choices) {
var prompt = ""; for (var i in choices) prompt += i + ". " + choices[i] + "\n"; prompt += question;
var input; while (1) { WScript.Echo(prompt); input = parseInt( WScript.StdIn.readLine() ); if (0 <= input && input < choices.length) break; WScript.Echo("\nTry again."); } return input;
}
var choices = ['fee fie', 'huff and puff', 'mirror mirror', 'tick tock']; var choice = select("Which is from the three pigs?", choices); WScript.Echo("you selected: " + choice + " -> " + choices[choice]);</lang>
Logo
<lang logo>to select :prompt [:options]
foreach :options [(print # ?)] forever [ type :prompt type "| | make "n readword if (and [number? :n] [:n >= 1] [:n <= count :options]) [output item :n :options] print sentence [Must enter a number between 1 and] count :options ]
end
print equal? [huff and puff] (select
[Which is from the three pigs?] [fee fie] [huff and puff] [mirror mirror] [tick tock])
</lang>
Lua
<lang lua>function choice(choices)
for i, v in ipairs(choices) do print(i, v) end
print"Enter your choice" local selection = io.read() + 0
if choices[selection] then print(choices[selection]) else choice(choices) end
end
choice{"fee fie", "huff and puff", "mirror mirror", "tick tock"}</lang>
MATLAB
<lang MATLAB>function sucess = menu(list)
if numel(list) == 0 sucess = ; return end
while(true) disp('Please select one of these options:'); for i = (1:numel(list)) disp([num2str(i) ') ' list{i}]); end disp([num2str(numel(list)+1) ') exit']); try key = input(':: '); if key == numel(list)+1 break elseif (key > numel(list)) || (key < 0) continue else disp(['-> ' list{key}]); end catch continue end end sucess = true;
end </lang>
MUMPS
<lang MUMPS>MENU(STRINGS,SEP)
;http://rosettacode.org/wiki/Menu NEW I,A,MAX ;I is a loop variable ;A is the string read in from the user ;MAX is the number of substrings in the STRINGS list ;SET STRINGS="fee fie^huff and puff^mirror mirror^tick tock" SET MAX=$LENGTH(STRINGS,SEP) QUIT:MAX=0 ""
WRITEMENU
FOR I=1:1:MAX WRITE I,": ",$PIECE(STRINGS,SEP,I),! READ:30 !,"Choose a string by its index: ",A,! IF (A<1)!(A>MAX)!(A\1'=A) GOTO WRITEMENU KILL I,MAX QUIT $PIECE(STRINGS,SEP,A)</lang>
Usage:
USER>W !,$$MENU^ROSETTA("fee fie^huff and puff^mirror mirror^tick tock","^") 1: fee fie 2: huff and puff 3: mirror mirror 4: tick tock Choose a string by its index: 3 mirror mirror USER>W !,$$MENU^ROSETTA("fee fie^huff and puff^mirror mirror^tick tock","^") 1: fee fie 2: huff and puff 3: mirror mirror 4: tick tock Choose a string by its index: 5 1: fee fie 2: huff and puff 3: mirror mirror 4: tick tock Choose a string by its index: A 1: fee fie 2: huff and puff 3: mirror mirror 4: tick tock Choose a string by its index: 0 1: fee fie 2: huff and puff 3: mirror mirror 4: tick tock Choose a string by its index: 1 fee fie
OCaml
<lang ocaml>let rec select choices prompt = (* "choices" is an array of strings *)
if Array.length choices = 0 then invalid_arg "no choices"; Array.iteri (Printf.printf "%d: %s\n") choices; print_string prompt; let index = read_int () in if index >= 0 && index < Array.length choices then choices.(index) else select choices prompt</lang>
Oz
<lang oz>declare
fun {Select Prompt Items} case Items of nil then "" else
for Item in Items Index in 1..{Length Items} do {System.showInfo Index#") "#Item} end {System.printInfo Prompt} try {Nth Items {ReadInt}} catch _ then {Select Prompt Items} end
end end
fun {ReadInt} class TextFile from Open.file Open.text end StdIo = {New TextFile init(name:stdin)} in {String.toInt {StdIo getS($)}} end Item = {Select "Which is from the three pigs: "
["fee fie" "huff and puff" "mirror mirror" "tick tock"]}
in
{System.showInfo "You chose: "#Item}</lang>
PARI/GP
<lang parigp>choose(v)=my(n);for(i=1,#v,print(i". "v[i]));while(type(n=input())!="t_INT"|n>#v|n<1,);v[n] choose(["fee fie","huff and puff","mirror mirror","tick tock"])</lang>
Perl
<lang perl>sub menu {
my ($prompt,@array) = @_; return unless @array;
print " $_: $array[$_]\n" for(0..$#array); print $prompt; $n = <>; return $array[$n] if $n =~ /^\d+$/ and defined $array[$n]; return &menu($prompt,@array);
}
@a = ('fee fie', 'huff and puff', 'mirror mirror', 'tick tock'); $prompt = 'Which is from the three pigs: ';
$a = &menu($prompt,@a);
print "You chose: $a\n";</lang>
Perl 6
<lang perl6>sub menu ( $prompt, @items ) {
return unless @items.elems; repeat until my $selection ~~ /^ \d+ $/ && @items[--$selection] { my $i = 1; say " {$i++}) $_" for @items; $selection = prompt $prompt; } return @items[$selection];
}
my @choices = 'fee fie', 'huff and puff', 'mirror mirror', 'tick tock'; my $prompt = 'Enter the number corresponding to your selection: ';
my $answer = menu( $prompt, [] ); say "You chose: $answer" if $answer.chars;
$answer = menu( $prompt, @choices ); say "You chose: $answer" if $answer.chars;</lang>
PL/I
<lang PL/I> test: proc options (main);
declare menu(4) character(100) varying static initial (
'fee fie', 'huff and puff', 'mirror mirror', 'tick tock');
declare (i, k) fixed binary;
do i = lbound(menu,1) to hbound(menu,1);
put skip edit (trim(i), ': ', menu(i) ) (a);
end; put skip list ('please choose an item number'); get list (k); if k >= lbound(menu,1) & k <= hbound(menu,1) then
put skip edit ('you chose ', menu(k)) (a);
else
put skip list ('Could not find your phrase');
end test; </lang>
PicoLisp
<lang PicoLisp>(de choose (Prompt Items)
(use N (loop (for (I . Item) Items (prinl I ": " Item) ) (prin Prompt " ") (NIL (setq N (in NIL (read)))) (T (>= (length Items) N 1) (get Items N)) ) ) )
(choose "Which is from the three pigs?"
'("fee fie" "huff and puff" "mirror mirror" "tick tock") )</lang>
Output:
1: fee fie 2: huff and puff 3: mirror mirror 4: tick tock Which is from the three pigs? 2 -> "huff and puff"
PowerShell
<lang powershell>function Get-Choice ([array] $Items) {
Set-StrictMode -Version Latest
do { $Items | ForEach-Object { $i = 0 } { '{0,3}. {1}' -f (++$i),$_ } $choice = Read-Host Your choice } while ($choice -notmatch '^\d+$' -or !(1..$Items.Length -eq $choice))
$Items[$choice-1]
}</lang> Trying it out: <lang powershell>Get-Choice 'fee fie', 'huff and puff', 'mirror mirror', 'tick tock'</lang>
1. fee fie 2. huff and puff 3. mirror mirror 4. tick tock Your choice: 0 1. fee fie 2. huff and puff 3. mirror mirror 4. tick tock Your choice: 5 1. fee fie 2. huff and puff 3. mirror mirror 4. tick tock Your choice: 2 huff and puff
PureBasic
<lang PureBasic>If OpenConsole()
Define i, txt$, choice Dim txts.s(4) EnableGraphicalConsole(1) ;- Enable graphical mode in the console Repeat ClearConsole() Restore TheStrings ; Set reads address For i=1 To 4 Read.s txt$ txts(i)=txt$ ConsoleLocate(3,i): Print(Str(i)+": "+txt$) Next ConsoleLocate(3,6): Print("Your choice? ") choice=Val(Input()) Until choice>=1 And choice<=4 ClearConsole() ConsoleLocate(3,2): Print("You chose: "+txts(choice)) ; ;-Now, wait for the user before ending to allow a nice presentation ConsoleLocate(3,5): Print("Press ENTER to quit"): Input()
EndIf End
DataSection
TheStrings: Data.s "fee fie", "huff And puff", "mirror mirror", "tick tock"
EndDataSection</lang>
Python
<lang python>def _menu(items):
for indexitem in enumerate(items): print (" %2i) %s" % indexitem)
def _ok(reply, itemcount):
try: n = int(reply) return 0 <= n < itemcount except: return False
def selector(items, prompt):
'Prompt to select an item from the items' if not items: return reply = -1 itemcount = len(items) while not _ok(reply, itemcount): _menu(items) # Use input instead of raw_input for Python 3.x reply = raw_input(prompt).strip() return items[int(reply)]
if __name__ == '__main__':
items = ['fee fie', 'huff and puff', 'mirror mirror', 'tick tock'] item = selector(items, 'Which is from the three pigs: ') print ("You chose: " + item)</lang>
Sample runs:
0) fee fie 1) huff and puff 2) mirror mirror 3) tick tock Which is from the three pigs: -1 0) fee fie 1) huff and puff 2) mirror mirror 3) tick tock Which is from the three pigs: 0 You chose: fee fie >>> ================================ RESTART ================================ >>> 0) fee fie 1) huff and puff 2) mirror mirror 3) tick tock Which is from the three pigs: 4 0) fee fie 1) huff and puff 2) mirror mirror 3) tick tock Which is from the three pigs: 3 You chose: tick tock
R
Uses menu. <lang R>showmenu <- function() {
choices <- c("fee fie", "huff and puff", "mirror mirror", "tick tock") ans <- menu(choices) if(ans==0) "" else choices[ans]
} str <- showmenu()</lang>
REXX
<lang rexx> /*REXX program shows a list, asks user for a selection number (integer).*/
do forever call list_create /*create the list from scratch. */ call list_show /*display (show) the list to user*/ if list.0==0 then return /*if empty list, then return null*/ say 'choose an item by entering a number from 1 --->' list.0 /*ask.*/ parse pull x /*get the user's choice (if any).*/ ok=1 /*assume everything is peachy. */ if x= then call sayErr "a choice wasn't entered" if words(x)\==1 then call sayErr 'too many choices entered:' if \datatype(x,'N') then call sayErr "the choice isn't numeric:" if \datatype(x,'W') then call sayErr "the choice isn't an integer:" if x<1 | x>list.0 then call sayErr "the choice isn't within range:" if ok then leave /*OK? Then we got a good choice.*/ end /*user might've entered 2. or 003*/
x=x/1 /*normalize the number (maybe). */ say; say 'you chose item' x": " list.x exit
list_create: /*there're other list-building methods.*/ list.1='fee fie' list.2='huff and puff' list.3='mirror mirror' list.4='tick tock' list.0=4 /*store # of choices in list.0 */ return /*(above) is just one convention.*/
list_show: say /*display a blank line. */
do j=1 for list.0 /*display the list of choices. */ say '(item' j") " list.j /*display item # with its choice.*/ end
say /*display another blank line. */ return
sayErr: if \ok then return; ok=0; say;say '***error!***' arg(1) x;say;say;return </lang>
REBOL
<lang REBOL>REBOL [ Title: "Text Menu" Author: oofoe Date: 2009-12-08 URL: http://rosettacode.org/wiki/Select ]
choices: ["fee fie" "huff and puff" "mirror mirror" "tick tock"] choice: ""
valid?: func [ choices [block! list! series!] choice ][ if error? try [choice: to-integer choice] [return false] all [0 < choice choice <= length? choices] ]
while [not valid? choices choice][ repeat i length? choices [print [" " i ":" choices/:i]] choice: ask "Which is from the three pigs? " ] print ["You chose:" pick choices to-integer choice]</lang>
Output:
1 : fee fie 2 : huff and puff 3 : mirror mirror 4 : tick tock Which is from the three pigs? klf 1 : fee fie 2 : huff and puff 3 : mirror mirror 4 : tick tock Which is from the three pigs? 5 1 : fee fie 2 : huff and puff 3 : mirror mirror 4 : tick tock Which is from the three pigs? 2 You chose: huff and puff
Ruby
<lang ruby>def select(prompt, items)
return "" if items.length == 0 while true items.each_index {|i| puts "#{i}. #{items[i]}"} print "#{prompt}: " begin answer = Integer(gets()) rescue ArgumentError redo end return items[answer] if answer.between?(0, items.length - 1) end
end
- test empty list
response = select("Which is empty", []) puts "empty list returns: >#{response}<" puts ""
- "real" test
items = ['fee fie', 'huff and puff', 'mirror mirror', 'tick tock'] response = select("Which is from the three pigs", items) puts "you chose: >#{response}<"</lang>
Tcl
<lang tcl>proc select {prompt choices} {
set nc [llength $choices] if {!$nc} {
return ""
} set numWidth [string length $nc] while true {
set i 0 foreach s $choices { puts [format " %-*d: %s" $numWidth [incr i] $s] } puts -nonewline "$prompt: " flush stdout gets stdin num if {[string is int -strict $num] && $num >= 1 && $num <= $nc} { incr num -1 return [lindex $choices $num] }
}
}</lang> Testing it out interactively... <lang tcl>% puts >[select test {}]< >< % puts >[select "Which is from the three pigs" {
"fee fie" "huff and puff" "mirror mirror" "tick tock"
}]<
1: fee fie 2: huff and puff 3: mirror mirror 4: tick tock
Which is from the three pigs: 0
1: fee fie 2: huff and puff 3: mirror mirror 4: tick tock
Which is from the three pigs: skdfjhgz
1: fee fie 2: huff and puff 3: mirror mirror 4: tick tock
Which is from the three pigs:
1: fee fie 2: huff and puff 3: mirror mirror 4: tick tock
Which is from the three pigs: 5
1: fee fie 2: huff and puff 3: mirror mirror 4: tick tock
Which is from the three pigs: 2 >huff and puff<</lang>
UNIX Shell
This example uses bash shell with its select statement. This example also works with other shells, such as pdksh, that provide the select statement.
<lang bash>bash$ PS3='Which is from the three pigs: ' bash$ select phrase in 'fee fie' 'huff and puff' 'mirror mirror' 'tick tock'; do > if -n $phrase ; then > PHRASE=$phrase > echo PHRASE is $PHRASE > break > else > echo 'invalid.' > fi > done 1) fee fie 2) huff and puff 3) mirror mirror 4) tick tock Which is from the three pigs: 5 invalid. Which is from the three pigs: 2 PHRASE is huff and puff bash$</lang>