User input/Text: Difference between revisions
m →{{header|PowerShell}}: strong typing. Should be a little better than just dumping a string into $number ... next up: check for the number being 75000 |
No edit summary |
||
Line 730: | Line 730: | ||
question task "What is your quest" |
question task "What is your quest" |
||
question doom "What is the air-speed velocity of an unladen swallow"</lang> |
question doom "What is the air-speed velocity of an unladen swallow"</lang> |
||
=={{header|TI-83 BASIC}}== |
|||
This program leaves the string in String1, and the integer in variable "i". |
|||
<lang ti83b> |
|||
:Input "Enter a string:",Str1 |
|||
:Prompt i |
|||
:If(i ≠ 75000): Then |
|||
:Disp "That isn't 75000" |
|||
:Else |
|||
:Stop |
|||
</lang> |
|||
=={{header|TI-89 BASIC}}== |
=={{header|TI-89 BASIC}}== |
Revision as of 21:59, 25 June 2010
You are encouraged to solve this task according to the task description, using any language you may know.
In this task, the goal is to input a string and the integer 75000, from the text console.
See also: User Input - graphical
Ada
<lang ada>function Get_String return String is
Line : String (1 .. 1_000); Last : Natural;
begin
Get_Line (Line, Last); return Line (1 .. Last);
end Get_String;
function Get_Integer return Integer is
S : constant String := Get_String;
begin
return Integer'Value (S); -- may raise exception Constraint_Error if value entered is not a well-formed integer
end Get_Integer; </lang>
The functions above may be called as shown below <lang ada>My_String : String := Get_String; My_Integer : Integer := Get_Integer;</lang>
ALGOL 68
<lang algol68>print("Enter a string: "); STRING s := read string; print("Enter a number: "); INT i := read int; ~</lang>
AutoHotkey
Windows console
<lang AutoHotkey>DllCall("AllocConsole") FileAppend, please type something`n, CONOUT$ FileReadLine, line, CONIN$, 1 msgbox % line FileAppend, please type '75000'`n, CONOUT$ FileReadLine, line, CONIN$, 1 msgbox % line</lang>
Input Command
this one takes input regardless of which application has focus. <lang AutoHotkey>TrayTip, Input:, Type a string: Input(String) TrayTip, Input:, Type an int: Input(Int) TrayTip, Done!, Input was recieved. Msgbox, You entered "%String%" and "%Int%" ExitApp Return
Input(ByRef Output) {
Loop { Input, Char, L1, {Enter}{Space} If ErrorLevel contains Enter Break Else If ErrorLevel contains Space Output .= " " Else Output .= Char TrayTip, Input:, %Output% }
}</lang>
AWK
This demo shows a same-line prompt, and that the integer i becomes 0 if the line did not parse as an integer. <lang awk>~/src/opt/run $ awk 'BEGIN{printf "enter a string: "}{s=$0;i=$0+0;print "ok,"s"/"i}' enter a string: hello world ok,hello world/0 75000 ok,75000/75000</lang>
BASIC
INPUT "Enter a string: ", s$ INPUT "Enter a number: ", i%
dim s as string dim i as integer input "Enter a string: ", s input "Enter the integer 75000: ", i
Befunge
This prompts for a string and pushes it to the stack a character at a time (~) until end of input (-1). <lang befunge><>:v:"Enter a string: "
^,_ >~:1+v ^ _@</lang>
Numeric input is easier, using the & command. <lang befunge><>:v:"Enter a number: "
^,_ & @</lang>
C
<lang c>#include <stdio.h> int main(int argc, char* argv[]) {
int input; if((scanf("%d", &input))==1) { printf("Read in %d\n", input); return 1; } return 0;
}</lang>
C++
<lang cpp>#include <iostream>
- include <string>
using namespace std;
int main() {
// while probably all current implementations have int wide enough for 75000, the C++ standard // only guarantees this for long int. long int integer_input; string string_input; cout << "Enter an integer: "; cin >> integer_input; cout << "Enter a string: "; cin >> string_input; return 0;
}</lang>
Note: The program as written above only reads the string up to the first whitespace character. To get a complete line into the string, replace <lang cpp> cin >> string_input;</lang> with <lang cpp> getline(cin, string_input);</lang>
Note: if a numeric input operation fails, the value is not stored for that operation, plus the fail bit is set, which causes all future stream operations to be ignored (e.g. if a non-integer is entered for the first input above, then nothing will be stored in either the integer and the string). A more complete program would test for an error in the input (with if (!cin) // handle error
) after the first input, and then clear the error (with cin.clear()
) if we want to get further input.
Alternatively, we could read the input into a string first, and then parse that into an int later.
C#
<lang csharp>using System;
namespace C_Sharp_Console {
class example {
static void Main() { string word; int num; Console.Write("Enter an integer: "); num = Console.Read(); Console.Write("Enter a String: "); word = Console.ReadLine(); } }
}</lang>
Clojure
<lang lisp>(import '(java.util Scanner)) (def scan (Scanner. *in*)) (def s (.nextLine scan)) (def n (.nextInt scan))</lang>
Common Lisp
<lang lisp>(format t "Enter some text: ") (let ((s (read-line)))
(format t "You entered ~s~%" s))
(format t "Enter a number: ") (let ((n (read)))
(if (numberp n) (format t "You entered ~d.~%" n) (format t "That was not a number.")))</lang>
D
<lang D>import tango.io.Console; import Integer = tango.text.convert.Integer;
void main() {
int num; char[] word; Cout("Enter an integer:")(); num = Integer.parse(Cin.get()); Cout("Enter a string:")(); word = Cin.get(); }</lang>
Erlang
<lang erlang>{ok, [String]} = io:fread("Enter a string: ","~s"). {ok, [Number]} = io:fread("Enter a number: ","~d").</lang>
Alternatively, you could use io:get_line to get a string: <lang erlang> String = io:get_line("Enter a string: ").</lang>
Factor
<lang factor>"Enter a string: " write readln "Enter a number: " write readln string>number</lang>
FALSE
FALSE has neither a string type nor numeric input. Shown instead are routines to parse and echo a word and to parse and interpret a number using the character input command (^). <lang false>[[^$' =~][,]#,]w: [0[^'0-$$9>0@>|~][\10*+]#%]d: w;! d;!.</lang>
Forth
Input a string
<lang forth>: INPUT$ ( n -- addr n )
PAD SWAP ACCEPT PAD SWAP ;</lang>
Input a number
The only ANS standard number interpretation word is >NUMBER ( ud str len -- ud str len ), which is meant to be the base factor for more convenient (but non-standard) parsing words. <lang forth>: INPUT# ( -- u true | false )
0. 16 INPUT$ DUP >R >NUMBER NIP NIP R> <> DUP 0= IF NIP THEN ;</lang>
<lang forth>: INPUT# ( -- n true | d 1 | false )
16 INPUT$ SNUMBER? ;</lang>
<lang forth>: INPUT# ( -- n true | false )
16 INPUT$ NUMBER? NIP DUP 0= IF NIP THEN ;</lang>
Note that NUMBER? always leaves a double result on the stack. INPUT# returns a single precision number. If you desire a double precision result, remove the NIP.
<lang forth>: input#
begin refill drop bl parse-word ( a n) number error? ( n f) while ( n) drop ( --) repeat ( n)
- </lang>
Here is an example that puts it all together:
<lang forth>: TEST
." Enter your name: " 80 INPUT$ CR ." Hello there, " TYPE CR ." Enter a number: " INPUT# CR IF ." Your number is " . ELSE ." That's not a number!" THEN CR ;</lang>
Fortran
<lang fortran>character(20) :: s integer :: i
print*, "Enter a string (max 20 characters)" read*, s print*, "Enter the integer 75000" read*, i</lang>
Groovy
<lang groovy>word = System.in.readLine() num = System.in.readLine().toInteger()</lang>
Haskell
<lang haskell>import System.IO (hFlush, stdout) main = do
putStr "Enter a string: " hFlush stdout str <- getLine putStr "Enter an integer: " hFlush stdout num <- readLn :: IO Int putStrLn $ str ++ (show num)</lang>
Note: :: IO Int is only there to disambiguate what type we wanted from read. If num were used in a numerical context, its type would have been inferred by the interpreter/compiler. Note also: Haskell doesn't automatically flush stdout when doing input, so explicit flushes are necessary.
Io
<lang io>string := File clone standardInput readLine("Enter a string: ") integer := File clone standardInput readLine("Enter 75000: ") asNumber</lang>
J
<lang j>require 'misc' NB. load system script</lang> <lang j>prompt 'Enter string: '
0".prompt 'Enter 75000: '</lang> Both of these sentences return the user provided input. But this implementation implements no error checking: For example, if a different number is entered at the second prompt, it will be used instead of 75000.
Java
<lang java>import java.io.BufferedReader; import java.io.InputStreamReader;
public class GetInput {
public static void main(String[] args) throws Exception { BufferedReader sysin = new BufferedReader(new InputStreamReader(System.in)); int number = Integer.parseInt(sysin.readLine()); String string = sysin.readLine(); }
}</lang>
or
<lang java>import java.util.Scanner;
public class GetInput {
public static void main(String[] args) { Scanner stdin = new Scanner(System.in); String string = stdin.nextLine(); int number = stdin.nextInt(); }
}</lang>
JavaScript
and only with cscript.exe
<lang javascript>WScript.Echo("Enter a string"); var str = WScript.StdIn.ReadLine();
var val = 0; while (val != 75000) {
WScript.Echo("Enter the integer 75000"); val = parseInt( WScript.StdIn.ReadLine() );
}</lang>
<lang javascript>print("Enter a string"); var str = readline();
var val = 0; while (val != 75000) {
print("Enter the integer 75000"); val = parseInt( readline() );
}</lang>
Logo
Logo literals may be read from a line of input from stdin as either a list or a single word. <lang logo>make "input readlist ; in: string 75000 show map "number? :input ; [false true]
make "input readword ; in: 75000 show :input + 123 ; 75123 make "input readword ; in: string 75000 show :input ; string 75000</lang>
Lua
<lang Lua>print('Enter a string: ') s = io.stdin:read() print('Enter a number: ') i = tonumber(io.stdin:read()) </lang>
Mathematica
<lang Mathematica>mystring = InputString["give me a string please"]; myinteger = Input["give me an integer please"];</lang>
MATLAB
The input() function automatically converts the user input to the correct data type (i.e. string or double). We can force the input to be interpreted as a string by using an optional parameter 's'.
Sample usage: <lang MATLAB>>> input('Input string: ') Input string: 'Hello'
ans =
Hello
>> input('Input number: ') Input number: 75000
ans =
75000
>> input('Input number, the number will be stored as a string: ','s') Input number, the number will be stored as a string: 75000
ans =
75000</lang>
Metafont
<lang metafont>string s; message "write a string: "; s := readstring; message s; message "write a number now: "; b := scantokens readstring; if b = 750:
message "You've got it!"
else:
message "Sorry..."
fi; end</lang>
If we do not provide a number in the second input, Metafont will complain. (The number 75000 was reduced to 750 since Metafont biggest number is near 4096).
mIRC Scripting Language
<lang mirc>alias askmesomething {
echo -a You answered: $input(What's your name?, e)
}</lang>
Modula-3
<lang modula3>MODULE Input EXPORTS Main;
IMPORT IO, Fmt;
VAR string: TEXT;
number: INTEGER;
BEGIN
IO.Put("Enter a string: "); string := IO.GetLine(); IO.Put("Enter a number: "); number := IO.GetInt(); IO.Put("You entered: " & string & " and " & Fmt.Int(number) & "\n");
END Input.</lang>
newLISP
<lang lisp>(print "Enter an integer: ") (set 'x (read-line)) (print "Enter a string: ") (set 'y (read-line))</lang>
OCaml
<lang ocaml>print_string "Enter a string: "; let str = read_line () in
print_string "Enter an integer: "; let num = read_int () in Printf.printf "%s%d\n" str num</lang>
Octave
<lang octave>% read a string ("s") s = input("Enter a string: ", "s");
% read a GNU Octave expression, which is evaluated; e.g. % 5/7 gives 0.71429 i = input("Enter an expression: ");
% parse the input for an integer printf("Enter an integer: "); ri = scanf("%d");
% show the values disp(s); disp(i); disp(ri);</lang>
Oz
<lang oz>declare
StdIn = {New class $ from Open.file Open.text end init(name:stdin)} StringInput Num = {NewCell 0}
in
{System.printInfo "Enter a string: "} StringInput = {StdIn getS($)}
for until:@Num == 75000 do {System.printInfo "Enter 75000: "} Line = {StdIn getS($)} in Num := try {String.toInt Line} catch _ then 0 end end</lang>
Pascal
<lang pascal>program UserInput(input, output); var i : Integer;
s : String;
begin
write('Enter an integer: '); readln(i); write('Enter a string: '); readln(s)
end.</lang>
Perl
<lang perl>#!/usr/bin/perl
my $string = <>; # equivalent to readline(*STDIN) my $integer = <>;</lang>
PHP
<lang php>#!/usr/bin/php <?php $string = fgets(STDIN); $integer = (int) fgets(STDIN);</lang>
PicoLisp
<lang PicoLisp>(in NIL # Guarantee reading from standard input
(let (Str (read) Num (read)) (prinl "The string is: \"" Str "\"") (prinl "The number is: " Num) ) )</lang>
Pike
<lang pike>int main(){
write("Enter a String: "); string str = Stdio.stdin->gets(); write("Enter 75000: "); int num = Stdio.stdin->gets();
}</lang>
PL/I
<lang PL/I> declare s character (100) varying; declare k fixed decimal (15);
put ('please type a string:'); get edit (s) (L); put skip list (s);
put skip list ('please type the integer 75000'); get list (k); put skip list (k); put skip ist ('Thanks'); </lang>
Pop11
<lang pop11>;;; Setup item reader lvars itemrep = incharitem(charin); lvars s, c, j = 0;
- read chars up to a newline and put them on the stack
while (charin() ->> c) /= `\n` do j + 1 -> j ; c endwhile;
- build the string
consstring(j) -> s;
- read the integer
lvars i = itemrep();</lang>
PostScript
<lang postscript>%open stdin for reading (and name the channel "kbd"): /kbd (%stdin) (r) file def %make ten-char buffer to read string into: /buf (..........) def %read string into buffer: kbd buf readline</lang>
At this point there will be two items on the stack: a boolean which is "true" if the read was successful and the string that was read from the kbd (input terminates on a <return>). If the length of the string exceeds the buffer length, an error condition occurs (rangecheck). For the second part, the above could be followed by this:
<lang postscript>%if the read was successful, convert the string to integer: {cvi} if</lang>
which will read the conversion operator 'cvi' (convert to integer) and the boolean and execute the former if the latter is true.
PowerShell
<lang powershell>$string = Read-Host "Input a string" [int]$number = Read-Host "Input a number"</lang>
PureBasic
<lang PureBasic> If OpenConsole()
; Declare a string and a integer to be used Define txt.s, num.i
Print("Enter a string: ") txt=Input()
Repeat Print("Enter the number 75000: ") num=Val(Input()) ; Converts the Input to a Value with Val() Until num=75000 ; Check that the user really gives us 75000! Print("You made it!") Delay(3000): CloseConsole()
EndIf</lang>
Python
Input a string
<lang python> string = raw_input("Input a string: ")</lang> In Python 3.0, raw_input will be renamed to input(). The Python 3.0 equivalent would be <lang python> string = input("Input a string: ")</lang>
Input a number
While input() gets a string in Python 3.0, in 2.x it is the equivalent of eval(raw_input(...)). Because this runs arbitrary code, and just isn't nice, it is being removed in Python 3.0. raw_input() is being changed to input() because there will be no other kind of input function in Python 3.0. <lang python> number = input("Input a number: ") # Deprecated, please don't use.</lang> Python 3.0 equivalent: <lang python> number = eval(input("Input a number: ")) # Evil, please don't use.</lang> The preferred way of getting numbers from the user is to take the input as a string, and pass it to any one of the numeric types to create an instance of the appropriate number. <lang python> number = float(raw_input("Input a number: "))</lang> Python 3.0 equivalent: <lang python> number = float(input("Input a number: "))</lang> float may be replaced by any numeric type, such as int, complex, or decimal.Decimal. Each one varies in expected input.
R
<lang R>stringval <- readline("String: ") intval <- as.integer(readline("Integer: "))</lang>
Raven
<lang raven>'Input a string: ' print expect as str 'Input an integer: ' print expect 0 prefer as num</lang>
REBOL
<lang REBOL>REBOL [ Title: "Textual User Input" Author: oofoe Date: 2009-12-07 URL: http://rosettacode.org/wiki/User_Input_-_text ]
s: n: ""
- Because I have several things to check for, I've made a function to
- handle it. Note the question mark in the function name, this convention
- is often used in Forth to indicate test of some sort.
valid?: func [s n][ error? try [n: to-integer n] ; Ignore error if conversion fails. all [0 < length? s 75000 = n]]
- I don't want to give up until I've gotten something useful, so I
- loop until the user enters valid data.
while [not valid? s n][ print "Please enter a string, and the number 75000:" s: ask "string: " n: ask "number: " ]
- It always pays to be polite...
print rejoin [ "Thank you. Your string was '" s "'."]</lang>
Output:
Please enter a string, and the number 75000: string: This is a test. number: ksldf Please enter a string, and the number 75000: string: number: 75000 Please enter a string, and the number 75000: string: Slert... number: 75000 Thank you. Your string was 'Slert...'.
REXX
<lang rexx>do until i = 75000
say "Input 75000" pull i
end</lang>
Ruby
<lang ruby>print "Enter a string: " s = gets print "Enter an integer: " i = gets.to_i # If string entered, will return zero puts "String = #{s}" puts "Integer = #{i}"</lang>
Scheme
The read procedure is R5RS standard, inputs a scheme representation so, in order to read a string, one must enter "hello world" <lang scheme>(define str (read)) (define num (read)) (display "String = ") (display str) (display "Integer = ") (display num)</lang>
Slate
<lang slate>print: (query: 'Enter a String: '). [| n |
n: (Integer readFrom: (query: 'Enter an Integer: ')). (n is: Integer) ifTrue: [print: n] ifFalse: [inform: 'Not an integer: ' ; n printString]
] do.</lang>
Smalltalk
<lang smalltalk>'Enter a number: ' display. a := stdin nextLine asInteger.
'Enter a string: ' display. b := stdin nextLine.</lang>
SNOBOL4
<lang snobol4> output = "Enter a string:"
str = trim(input) output = "Enter an integer:" int = trim(input) output = "String: " str " Integer: " int
end</lang>
Standard ML
<lang sml>print "Enter a string: "; let val str = valOf (TextIO.inputLine TextIO.stdIn) in (* note: this keeps the trailing newline *)
print "Enter an integer: "; let val num = valOf (TextIO.scanStream (Int.scan StringCvt.DEC) TextIO.stdIn) in print (str ^ Int.toString num ^ "\n") end
end</lang>
Tcl
Like LISP, there is no concept of a "number" in TCL - the only real variable type is a string (whether a string might represent a number is a matter of interpretation of the string in a mathematical expression at some later time). Thus the input is the same for both tasks:
<lang tcl>set str [gets stdin] set num [gets stdin]</lang>
possibly followed by something like
<lang tcl>if {![string is integer -strict $num]} then { ...do something here...}</lang>
If the requirement is to prompt until the user enters the integer 75000, then: <lang tcl>set input 0 while {$input != 75000} {
puts -nonewline "enter the number '75000': " flush stdout set input [gets stdin]
}</lang>
Of course, it's nicer to wrap the primitives in a procedure: <lang tcl>proc question {var message} {
upvar 1 $var v puts -nonewline "$message: " flush stdout gets stdin $v
} question name "What is your name" question task "What is your quest" question doom "What is the air-speed velocity of an unladen swallow"</lang>
TI-83 BASIC
This program leaves the string in String1, and the integer in variable "i".
<lang ti83b>
:Input "Enter a string:",Str1 :Prompt i :If(i ≠ 75000): Then :Disp "That isn't 75000" :Else :Stop
</lang>
TI-89 BASIC
This program leaves the requested values in the global variables s and integer.
<lang ti89b>Prgm
InputStr "Enter a string", s Loop Prompt integer If integer ≠ 75000 Then Disp "That wasn't 75000." Else Exit EndIf EndLoop
EndPrgm</lang>
Toka
<lang toka>needs readline ." Enter a string: " readline is-data the-string ." Enter a number: " readline >number [ ." Not a number!" drop 0 ] ifFalse is-data the-number
the-string type cr the-number . cr</lang>
UNIX Shell
<lang bash>#!/bin/sh
read STRING read INTEGER</lang>
<lang bash>#!/bin/bash
read STRING read INTEGER</lang>
Vedit macro language
<lang vedit>Get_Input(1, "Enter a string: ")
- 2 = Get_Num("Enter a number: ")</lang>
Visual Basic .NET
Platform: .NET
Input an Integer
<lang vbnet>Dim i As Integer Console.WriteLine("Enter an Integer") i = Console.ReadLine()</lang>
Input an Integer With Error Handling
<lang vbnet>Dim i As Integer Dim iString As String Console.WriteLine("Enter an Integer") iString = Console.ReadLine() Try
i = Convert.ToInt32(iString)
Catch ex As Exception
Console.WriteLine("This is not an Integer")
End Try</lang>
Input a String
<lang vbnet>Dim i As String Console.WriteLine("Enter a String") i = Console.ReadLine()</lang>
- Programming Tasks
- Text processing
- Selection/Short Circuit/Console Program Basics
- Basic language learning
- Ada
- ALGOL 68
- AutoHotkey
- AWK
- BASIC
- Befunge
- C
- C++
- C sharp
- Clojure
- Common Lisp
- D
- Erlang
- Factor
- FALSE
- Forth
- Fortran
- Groovy
- Haskell
- Io
- J
- Java
- JavaScript
- Logo
- Lua
- Mathematica
- MATLAB
- Metafont
- MIRC Scripting Language
- Modula-3
- NewLISP
- OCaml
- Octave
- Oz
- Pascal
- Perl
- PHP
- PicoLisp
- Pike
- PL/I
- Pop11
- PostScript
- PowerShell
- PureBasic
- Python
- R
- Raven
- REBOL
- REXX
- Ruby
- Scheme
- Slate
- Smalltalk
- SNOBOL4
- Standard ML
- Tcl
- TI-83 BASIC
- TI-89 BASIC
- Toka
- UNIX Shell
- Vedit macro language
- Visual Basic .NET