Ch7Ex2

package ch7ex2;
import java.util.Scanner;

public class Ch7Ex2
{
    public static double I2C(double inches)
    {
        double cm=inches*2.54;
        return cm;
    }
    public static double F2C(double feet)
    {
        double cm=feet*30.48;
        return cm;
    }
    public static double Y2M(double yards)
    {
        double meters=yards/1.094;
        return meters;
    }
    public static double M2K(double miles)
    {
        double km=miles/1.609;
        return km;
    }
    public static void C2I(double cm)
    {
        double inches=cm/2.54;
        System.out.printf("%.2f",inches);
    }
    public static void C2F(double cm)
    {
        double feet=cm/30.48;
        System.out.printf("%.2f",feet);
    }
    public static void M2Y(double meters)
    {
        double yards=meters*1.094;
        System.out.printf("%.2f",yards);
    }
    public static void K2M(double km)
    {
        double miles=km*1.609;
        System.out.printf("%.2f",miles);
    }
    public static void main(String[] args)
    {
        Scanner sc=new Scanner(System.in);
        System.out.println("Convert: ");
        System.out.println("1. Inches to Centimeters");
        System.out.println("2. Feet to Centimeters");
        System.out.println("3. Yards to Meters");
        System.out.println("4. Miles to Kilometers");
        System.out.println("5. Centimeters to Inches");
        System.out.println("6. Centimeters to Feet");
        System.out.println("7. Meters to Yards");
        System.out.println("8. Kilometers to Miles");
        System.out.println("Enter your choice: ");
        int choice=sc.nextInt();
        System.out.println("Enter a number to convert: ");
        double num=sc.nextDouble();
        if(choice==1)
        {
            System.out.print(num+" inches = ");
            System.out.printf("%.2f",I2C(num));
            System.out.println(" centimeters");
        }
        if(choice==2)
        {
            System.out.print(num+" feet = ");
            System.out.printf("%.2f",F2C(num));
            System.out.println(" centimeters");
        }
        if(choice==3)
        {
            System.out.print(num+" yards = ");
            System.out.printf("%.2f",Y2M(num));
            System.out.println(" meters");
        }
        if(choice==4)
        {
            System.out.print(num+" miles = ");
            System.out.printf("%.2f",M2K(num));
            System.out.println(" kilometers");
        }
        if(choice==5)
        {
            System.out.print(num+" centimeters = ");
            C2I(num);
            System.out.println(" inches");
        }
        if(choice==6)
        {
            System.out.print(num+" centimeters = ");
            C2F(num);
            System.out.println(" feet");
        }
        if(choice==7)
        {
            System.out.print(num+" meters = ");
            M2Y(num);
            System.out.println(" yards");
        }
        if(choice==8)
        {
            System.out.print(num+" kilometers = ");
            K2M(num);
            System.out.println(" miles");
        }
    }
}