Question

This is a basic java program where you convert units using only loops, control statements and format modifiers:

Create a Java program named UnitConversion.java that converts the following:
1. Liter to gallon
2. Gallon to liter
3. Kilometers to miles
4. Miles to kilometers
The conversion formulas:
1 liter = 0.264172 gallon
1 gallon = 3.78541 liters
1 kilometer = 0.621 miles
I mile = 1.609 kilometers

Answer 1

import java.util.Scanner;

public class UnitConversion {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        System.out.println("1. liters to gallons:");
        System.out.print("Please enter a value for liters:");
        double liters = in.nextDouble();
        System.out.printf(liters + " liters   =  %.2f gallons\n", liters*0.264172);

        System.out.println("\n2. gallons to liters:");
        System.out.print("Please enter a value for gallons:");
        double gallons = in.nextDouble();
        System.out.printf(gallons + " gallons  =  %.2f liters\n", gallons/0.264172);

        System.out.println("\n3. km to miles:");
        System.out.print("Please enter a value for kilometers:");
        double km = in.nextDouble();
        System.out.printf(km + " km  =  %.2f miles\n", km*0.621);

        System.out.println("\n4. miles to km:");
        System.out.print("Please enter a value for miles:");
        double miles = in.nextDouble();
        System.out.printf(miles + " miles   =  %.2f km\n", miles*1.609);
    }

}