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Comp102   lec 5.0
Comp102   lec 5.0
Comp102   lec 5.0
Comp102   lec 5.0
Comp102   lec 5.0
Comp102   lec 5.0
Comp102   lec 5.0
Comp102   lec 5.0
Comp102   lec 5.0
Comp102   lec 5.0
Comp102   lec 5.0
Comp102   lec 5.0
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Comp102 lec 5.0

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Transcript

  • 1. Random Numbers•http://www.cs.geneseo.edu/~baldwin/reference/random.html
  • 2. Two MethodsBy using Random Library ClassBy using Math Library Class
  • 3. RANDOM CLASS
  • 4. Random ClassTo use a class Import the class library import java.util.Random; OR import java.util.*; Create an object of class Random “name of object” = new Random() E.g • Random rand = new Random();
  • 5. Generate a Random Number IntegerHave/Declare an integer variable int a;Assign it a random value a=“object”.nextInt(“Value to define Range”); E.g a = rand.nextInt(100); If value is 100, range is 0 – 99 Value will define the range as starting from 0 to one less than the value
  • 6. Define Ranges, where A is an Integer and rand is Random ObjectA= rand.nextInt(100) 0 - 99A= rand.nextInt(10) 0-9A= rand.nextInt(101) 0 - 100A= rand.nextInt(99) 0 - 98A= rand.nextInt(100) + 0 – 99 and then add 5 to it =>5 5-104A= rand.nextInt(100) – 0 -99 and then subtract 10 =>10 -10 – 89A= rand.nextInt(10) + 1 0 – 9 and then add 1 => 1 - 10 0-100 and then add 5 => 5 - 105A= rand.nextInt(101)+5 0-9 and then subtract 10 => -10 – (-A= rand.nextInt(10) -10 1)
  • 7. What if I have to generate aRandom Number from 0 –Random Will generate a 50, Will generate a both inclusivethen0subtractfrom Number from 0 – 99 first random number and -49 50 fromWill generate random Will generate number generated a a A = rand.nextInt(50); thus numberthe range50 defines from 0 - as random number from [0 – 49 and then will 0 – 50] – [99 – 50] = A = rand.nextInt(51); -50 - 49 add 1 to it, makes range as 1 – 50 A = rand.nextInt(100)-50; A = rand.nextInt(50)+1;
  • 8. What if I have to generate aRandom Number from 5 – 15 both inclusive?a = rand.nextInt(15);a = rand.nextInt(16);a = rand.nextInt(10)+5;a = rand.nextInt(11)+5;
  • 9. Random Real NumbersTo generate a random real numberuniformly distributed between 0and 1, use the "nextDouble"message. This message takes noparameters. For example...double r = rand.nextDouble();
  • 10. CLASS MATH
  • 11. Math.random() calldouble x = Math.random(); Returns a double value with a positive sign, greater than or equal to 0.0 and less than 1.0. Will assign a value to x from [0.0 – 0.999]
  • 12. Generate Integer Random NumberMath.random()*10 [0.0 – 9.99] Convert it into Integer by type casting (int)(Math.random()*10) [0 – 9]Math.random()*100 [0.0 – 99.99] Convert it into Integer by type casting (int)(Math.random()*100 [0 – 99]

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