// File: random.js 
// Author: Dave Reed 
// Date: 1/10/00 // 
// This file contains several routines for generating random values //////////////////////////////////////////////////////////////////////// 

function randomNum(low, high) 
// Given : low <= high 
// Returns : a random number in the range [low, high) 
{ 
   return Math.random()*(high-low) + low; 
} 

function randomInt(low, high) 
// Given : low <= high 
// Returns : a random integer in the range [low, high] 
{ 
   return Math.floor(Math.random()*(high-low+1)) + low; 
} 

function randomChar(str) 
// Given : str is a nonempty string 
// Returns: a random character from the string 
{ 
   return str.charAt(randomInt(0, str.length-1)); 
} 

function randomOneOf(list) 
// Given : list is a nonempty list (array) 
// Returns: a random item from the list 
{ 
   return list[randomInt(0, list.length-1)];
}