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import java.util.Scanner;

public class RandomNumberGeneration {

public static void main(String[] args) {

System.out.println("Program to generate a Random Number\n---");

int option = 0;

Scanner sm = new Scanner(System.in);

System.out.print("Enter 0 to generate any random number OR "

+ "\nEnter 1 to generate a random number between a range"

+ "\nEnter 2 to generate a random of fixed length: ");

// DEFINED SEPARATELY FOR BETTER UNDERSTANDING

option = sm.nextInt();

if (option ==0) {

generateRandom();

}

else if (option ==1) {

generateRandomBetweenRange();

}

else if (option ==2) {

generateRandomWithLength();

}

else {

System.out.println("Invalid Option. Try Again");

end();

}

sm.close();

}

private static void generateRandom() {

int a = (int) ((Math.random()*((10000-0)+1))+0);

System.out.println("OUTPUT: "+a);

end();

}

private static void generateRandomBetweenRange() {

Scanner ss = new Scanner(System.in);

System.out.print("Enter lower limit: ");

int lower = ss.nextInt();

System.out.print("Enter upper limit: ");

int upper = ss.nextInt();

ss.close();

if (upper<lower) {

System.out.println("Upper cannot be lesser than lower"); //RECOMMENDED

end();

}

if(upper<0 ||lower<0) {

System.out.println("Limits cannot be lesser than zero"); //RECOMMENDED

end();

}

int a = (int) ((Math.random()*((upper-lower)+1))+lower);

System.out.println("OUTPUT: "+a);

end();

}

private static void generateRandomWithLength() {

Scanner ss = new Scanner(System.in);

System.out.print("Enter the length (int max =10): ");

int len = ss.nextInt();

int a = (int) (Math.random()*(Math.pow(10, len)));

System.out.println("OUTPUT: "+a);

ss.close();

end();

}

private static void end() {

System.out.println("---\nThe Program has ended.");

System.exit(0);

}

}