Sleep

Write a program that does the following in this order:

• Input an amount of time to sleep in whatever units are most natural for your language (milliseconds, seconds, ticks, etc.). This unit should be noted in comments or in a description.
• Print "Sleeping..."
• Sleep the main thread for the given amount of time.
• Print "Awake!"
• End.

Sleep
You are encouraged to solve this task according to the task description, using any language you may know.

Ada

The Ada delay statement takes an argument of type Duration, which is a real number counting the number of seconds to delay. Thus, 2.0 will delay 2.0 seconds, while 0.001 will delay 0.001 seconds.

<ada>with Ada.Text_Io; use Ada.Text_Io; with Ada.Float_Text_Io; use Ada.Float_Text_Io;

procedure Sleep is

  In_Val : Float;

begin

  Get(In_Val);
  Put_Line("Sleeping...");
  delay Duration(In_Val);
  Put_Line("Awake!");

end Sleep;</ada>

BASIC

Works with: QuickBasic version 4.5

<qbasic>INPUT sec 'the SLEEP command takes seconds PRINT "Sleeping..." SLEEP sec PRINT "Awake!"</qbasic> "SLEEP" with no argument will sleep until a button is pressed on the keyboard (including modifier keys such as shift or control). Also, pressing a key while SLEEP is waiting for a specific amount of time (as above) will end the SLEEP.

C++

<cpp>#include <unistd.h>

1. include <iostream>

using namespace std;

int main(int argc, char* argv[]) {

   useconds_t microseconds;
   cin >> microseconds;
   cout << "Sleeping..." << endl;
   usleep(microseconds);
   cout << "Awake!" << endl;
   return 0;

}</cpp>

Haskell

import Control.Concurrent

main = do seconds <- readLn
          putStrLn "Sleeping..."
          threadDelay (seconds * 1000000)
          putStrLn "Awake!"

Java

<java>import java.util.Scanner;

public class Sleep{ public static void main(String[] args) throws InterruptedException{ Scanner input = new Scanner(System.in); int ms = input.nextInt(); //Java's sleep method accepts milliseconds System.out.println("Sleeping..."); Thread.sleep(ms); System.out.println("Awake!"); } }</java>

OCaml

#load "unix.cma";;
let seconds = read_int ();;
print_endline "Sleeping...";;
Unix.sleep seconds;; (* number is integer in seconds *)
print_endline "Awake!";;

Perl

seconds: <perl>$seconds = <>; print "Sleeping...\n"; sleep $seconds; # number is in seconds print "Awake!\n";</perl>

microseconds and nanoseconds using the Time::HiRes module: <perl>use Time::HiRes qw( usleep nanosleep );

$microseconds = <>; print "Sleeping...\n"; usleep $microseconds; print "Awake!\n";

$nanoseconds = <>; print "Sleeping...\n"; nanosleep $nanoseconds; print "Awake!\n";</perl>

Python

<python>import time

seconds = float(raw_input()) print "Sleeping..." time.sleep(seconds) # number is in seconds print "Awake!"</python>

Toka

This makes use of the sleep() function from libc which suspends execution for a specified number of seconds.

 1 import sleep as sleep()
 [ ." Sleeping...\n" sleep() drop ." Awake!\n" bye ] is sleep
 
 45 sleep