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GeezerVison is showing github.com — Java-Programs/Basic-Java/RandomNumberGeneration.java at master · iamarav/Java-Programs

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RandomNumberGeneration.java

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RandomNumberGeneration.java

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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);
}
}
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