Java Code: Generating random numbers with Math.random() within a certain range. Math.random() range: 0.0 <= x < 1.

Question

Math.random() range: 0.0 <= x < 1.

1. Generate a random integer "i" such that "i" is in the following range: 10 <= i < 20; 10 <= i <= 50.
2. Write an expression that returns '0' or '1' randomly using Math.random()?

Please show your work.

Answer 1

class RandomInts

{

public long RandomLongBetween( long minVal, long maxVal)

{

return(

(long) (Math.floor(Math.random()*(maxVal-minVal)))+minVal

);

}

public boolean RandomBoolean()

{

return(

(Math.random()>0.5)

);

}

public static void main (String args[])

{

RandomInts myRandomRNG = new RandomInts();

int N1=10;

int N2=25;

System.out.println(" some integers between 10 and 20..... ");

for (int iLoop=0; iLoop<N1; iLoop++)

{

System.out.print(myRandomRNG.RandomLongBetween(10,20) + " ");

}

System.out.println("\n----------------------------------------\n");

System.out.println(" some integers between 10 and 50..... ");

for (int iLoop=0; iLoop<N2; iLoop++)

{

System.out.print(myRandomRNG.RandomLongBetween(10,50) + " ");

}

System.out.println("\n-----------------------------------------\n");

System.out.println(" some random booleans ");

for (int iLoop=0; iLoop<10; iLoop++)

{

System.out.print(myRandomRNG.RandomBoolean() + " ");

}

}