The given program that prompts the user to enter a decimal number and displays the number in a fraction is:
import java.math.BigInteger;
import java.util.Scanner;
public class Exercise_13_19 {
/** Main method */
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
// Prompt the user to enter a decimal number
System.out.print("Enter a decimal number: ");
String[] decimal = input.nextLine().split("[.]");
// Create a Rational object of the integer part of the decimal number
Rational r1 = new Rational(new BigInteger(decimal[0]), BigInteger.ONE);
// Create a Rational object of the fractional part of the decimal number
Rational r2 = new Rational(new BigInteger(decimal[1]), new BigInteger(
String.valueOf((int)Math.pow(10, decimal[1].length()))));
// Display fraction number
System.out.println("The fraction number is " +
(decimal[0].charAt(0) == '-' ? (r1).subtract(r2) : (r1).add(r2)));
}
}
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