Question

import java.util.Random;

class Conversions {
public static void main(String[] args) {

public static double quartsToGallons(double quarts) {

return quarts * 0.25;
}

public static double milesToFeet(double miles) {
return miles * 5280;
}

public static double milesToInches(double miles) {
return miles * 63360;
}

public static double milesToYards(double miles) {
return miles * 1760;
}

public static double milesToMeters(double miles) {
return miles * 1609.34;
}

public static double milesToKilometer(double miles) {
return milesToMeters(miles) / 1000.0;
}

public static double inchesToFeet(double inches) {
return inches * 0.0833333;
}

public static int minutesToSeconds(int minutes) {
return minutes * 60;
}

public static double minutesToHours(int minutes) {
return minutes / 60.0;
}

public static double minutesToDays(int minutes) {
return minutes / (24 * 60);
}

public static int randRange(int low, int high) {
Random random = new Random();
// returns inclusive of low and high
return low + random.nextInt(1 + high - low);
}

public static double percentage(double x, double y) {
return x * 100 / y;
}

}

class Driver {
public static void main(String[] args) {
System.out.println("1000 Quarts = " + Conversions.quartsToGallons(1000) + " gallons");

System.out.println("12 Miles = " + Conversions.milesToFeet(12) + " feet");
System.out.println("12 Miles = " + Conversions.milesToInches(12) + " inches");
System.out.println("12 Miles = " + Conversions.milesToYards(12) + " yards");
System.out.println("12 Miles = " + Conversions.milesToMeters(12) + " meters");
System.out.println("12 Miles = " + Conversions.milesToKilometer(12) + " kilometers");

System.out.println("50 inches = " + Conversions.inchesToFeet(50) + " feet");

System.out.println("1200 minutes = " + Conversions.minutesToSeconds(1200) + " seconds");
System.out.println("1200 minutes = " + Conversions.minutesToHours(1200) + " hours");
System.out.println("1200 minutes = " + Conversions.minutesToDays(1200) + " days");

System.out.println("Random number between [1-20] = " + Conversions.randRange(1, 20));

System.out.println("2 is " + Conversions.percentage(2, 5) + "% of 5");

}

  
}

what is wrong with my code?

Answer 1

//You have defined functions in main() method
//and called the functions defined inside in Driver class
//just remove the main method definition in Conversions
//and then execute the Driver class . you will get the output.
//--------- Conversions.java ------------
import java.util.Random;

class Conversions {

   public static double quartsToGallons(double quarts) {

       return quarts * 0.25;
   }

   public static double milesToFeet(double miles) {
       return miles * 5280;
   }

   public static double milesToInches(double miles) {
       return miles * 63360;
   }

   public static double milesToYards(double miles) {
       return miles * 1760;
   }

   public static double milesToMeters(double miles) {
       return miles * 1609.34;
   }

   public static double milesToKilometer(double miles) {
       return milesToMeters(miles) / 1000.0;
   }

   public static double inchesToFeet(double inches) {
       return inches * 0.0833333;
   }

   public static int minutesToSeconds(int minutes) {
       return minutes * 60;
   }

   public static double minutesToHours(int minutes) {
       return minutes / 60.0;
   }

   public static double minutesToDays(int minutes) {
       return minutes / (24 * 60);
   }

   public static int randRange(int low, int high) {
       Random random = new Random();
       // returns inclusive of low and high
       return low + random.nextInt(1 + high - low);
   }

   public static double percentage(double x, double y) {
       return x * 100 / y;
   }

}

//----------- Driver.java ---------
class Driver {
   public static void main(String[] args) {
       System.out.println("1000 Quarts = " + Conversions.quartsToGallons(1000) + " gallons");

       System.out.println("12 Miles = " + Conversions.milesToFeet(12) + " feet");
       System.out.println("12 Miles = " + Conversions.milesToInches(12) + " inches");
       System.out.println("12 Miles = " + Conversions.milesToYards(12) + " yards");
       System.out.println("12 Miles = " + Conversions.milesToMeters(12) + " meters");
       System.out.println("12 Miles = " + Conversions.milesToKilometer(12) + " kilometers");

       System.out.println("50 inches = " + Conversions.inchesToFeet(50) + " feet");

       System.out.println("1200 minutes = " + Conversions.minutesToSeconds(1200) + " seconds");
       System.out.println("1200 minutes = " + Conversions.minutesToHours(1200) + " hours");
       System.out.println("1200 minutes = " + Conversions.minutesToDays(1200) + " days");

       System.out.println("Random number between [1-20] = " + Conversions.randRange(1, 20));

       System.out.println("2 is " + Conversions.percentage(2, 5) + "% of 5");

   }

}