User input/Text: Difference between revisions
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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: |
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: |
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<lang tcl> |
<lang tcl>set str [gets stdin] |
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set num [gets stdin]</lang> |
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possibly followed by something like |
possibly followed by something like |
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<lang tcl> |
<lang tcl>if {![string is integer -strict $num]} then { ...do something here...}</lang> |
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If the requirement is to prompt until the user enters the integer 75000, then: |
If the requirement is to prompt until the user enters the integer 75000, then: |
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<lang tcl>set input 0 |
<lang tcl>set input 0 |
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while {$input != 75000} { |
while {$input != 75000} { |
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set input [gets stdin] |
set input [gets stdin] |
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}</lang> |
}</lang> |
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or |
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Of course, it's nicer to wrap the primitives in a procedure: |
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<lang tcl>proc question {var message} { |
<lang tcl>proc question {var message} { |
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upvar 1 $var v |
upvar 1 $var v |
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question task "What is your quest" |
question task "What is your quest" |
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question doom "What is the air-speed velocity of an unladen swallow"</lang> |
question doom "What is the air-speed velocity of an unladen swallow"</lang> |
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=={{header|Toka}}== |
=={{header|Toka}}== |
Revision as of 07:52, 8 July 2009
You are encouraged to solve this task according to the task description, using any language you may know.
In this task, the goal is to input a string and the integer 75000, from the text console.
Ada
<lang ada>
function Get_String return String is Line : String (1 .. 1_000); Last : Natural; begin Get_Line (Line, Last); return Line (1 .. Last); end Get_String; function Get_Integer return Integer is S : constant String := Get_String; begin return Integer'Value (S); -- may raise exception Constraint_Error if value entered is not a well-formed integer end Get_Integer; </lang>
The functions above may be called as shown below <lang ada>
My_String : String := Get_String; My_Integer : Integer := Get_Integer;
</lang>
ALGOL 68
print("Enter a string: "); STRING s := read string; print("Enter a number: "); INT i := read int; ~
AutoHotkey
Windows console
<lang AutoHotkey> DllCall("AllocConsole") FileAppend, please type something`n, CONOUT$ 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).
<>:v:"Enter a string: " ^,_ >~:1+v ^ _@
Numeric input is easier, using the & command.
<>:v:"Enter a number: " ^,_ & @
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 <istream> #include <ostream> #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> readline(cin, string_input);</lang>
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 clojure>(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>
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 (^).
[[^$' =~][,]#,]w: [0[^'0-$$9>0@>|~][\10*+]#%]d: w;! d;!.
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.
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> main = do
putStr "Enter a string: " str <- getLine putStr "Enter an integer: " 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.
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;
Scanner stdin = new Scanner(System.in); String string = stdin.nextLine(); int number = stdin.nextInt();</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>
Mathematica
<lang Mathematica>
mystring = InputString["give me a string please"]; myinteger = Input["give me an integer please"];
</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
alias askmesomething { echo -a You answered: $input(What's your name?, e) }
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
(print "Enter an integer: ") (set 'x (read-line)) (print "Enter a string: ") (set 'y (read-line))
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>
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>
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"
$number = Read-Host "Input a number"</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.
Raven
<lang raven> 'Input a string: ' print expect as str
'Input an integer: ' print expect 0 prefer as num</lang>
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.to_s</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>
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>
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
UNIX Shell
#!/bin/sh read STRING read INTEGER
#!/bin/bash read STRING read INTEGER
Vedit macro language
Get_Input(1, "Enter a string: ") #2 = Get_Num("Enter a number: ")
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
- Basic language learning
- Ada
- ALGOL 68
- AutoHotkey
- AWK
- BASIC
- Befunge
- C
- C++
- C sharp
- Clojure
- Common Lisp
- D
- Erlang
- FALSE
- Forth
- Fortran
- Groovy
- Haskell
- Java
- Logo
- Mathematica
- Metafont
- MIRC Scripting Language
- Modula-3
- NewLISP
- OCaml
- Octave
- Pascal
- Perl
- PHP
- Pop11
- PostScript
- PowerShell
- Python
- Raven
- REXX
- Ruby
- Scheme
- Slate
- Standard ML
- Tcl
- Toka
- UNIX Shell
- Vedit macro language
- Visual Basic .NET