In this exercise, you will create a temperature converter which will convert Fah

Question

In this exercise, you will create a temperature converter which will convert Fahrenheit values to Celsius and vice-versa. You will need the following two formulas which relate the temperature f in Fahrenheit to the temperature c in Celsius: f = c times 9/5 + 32 c = (f - 32) times 5/9. The input will be a string consisting of a floating-point number followed immediately by the letter F or C, such as "13.2C". You should convert to the other temperature scale and print the converted value in the same format. For example, if the input is "8F" then the output should be (approximately) "-13.333C", and if the input is "12.5C" then the output should be "54. 5F".

Explanation / Answer

FahrenheitToCelsius.java

import java.util.Scanner;

public class FahrenheitToCelsius {

   public static void main(String[] args) {
       //Declaring variables
       int choice;
      
       //Scanner class object is used to read the inputs entered by the user
       Scanner sc=new Scanner(System.in);
       do
       {
           //Displaying the menu
           System.out.println(" :: Menu ::");
           System.out.println("1.Fahrenheit to Celsius");
           System.out.println("2.Celsius to Fahrenheit");
           System.out.println("3.Exit");
          
           //Getting the user choice
           System.out.print("Enter choice :");
           choice=sc.nextInt();
          
           //Based on the choice .The corresponding case will get executed.
           switch(choice)
           {
           case 1:{
              
               //Declaring variables
               String strfah,strcel;
               double fahrenheit,celsius;
              
              
               //Getting the temperature value in Fahrenheit entered by the user
               System.out.print(" Enter the Temperature in Fahrenheit(F):");
               strfah=sc.next();
               int index=strfah.indexOf("F");
              
               //Parsing the String to Double
               fahrenheit=Double.parseDouble(strfah.substring(0,index));
              
               //Converting the fahrenheit to celsius
               celsius=Math.floor(((fahrenheit-32)*5/9) * 1000) / 1000.0;
              
               //Concatenating with "C" by converting the celsius value to String
               strcel=String.valueOf(celsius)+"C";
              
               //Displaying the output
               System.out.println(" The Temperature in Celsius(C) is "+strcel);
              
               continue;
              
           }
           case 2:{
               //Declaring variables
               String strfah,strcel;
               double fahrenheit,celsius;

               //Getting the temperature value in Celsius entered by the user
               System.out.print(" Enter the Temperature in Celsius(C):");
               strcel=sc.next();
               int index=strcel.indexOf("C");
              
               //Parsing the String to Double
               celsius=Double.parseDouble(strcel.substring(0,index));
              
               //Converting the celsius to fahrenheit
               fahrenheit=Math.floor((((celsius*9)/5)+32) * 1000) / 1000.0;
  
               //Concatenating with "F" by converting the Fahrenheit value to String
               strfah=String.valueOf(fahrenheit)+"F";
              
               //Displaying the output
               System.out.println(" The Temperature in Fahrenheit(F) is "+strfah);
               continue;
           }
           case 3:{
               System.out.println("** Program Exit **");
               break;
           }
           default:{
               System.out.println("Invalid inttput.");
               continue;
           }
           }
          
  
       }while(choice!=3);
      
   }

}

______________________

Output:

:: Menu ::
1.Fahrenheit to Celsius
2.Celsius to Fahrenheit
3.Exit
Enter choice :1

Enter the Temperature in Fahrenheit(F):8F

The Temperature in Celsius(C) is -13.334C

:: Menu ::
1.Fahrenheit to Celsius
2.Celsius to Fahrenheit
3.Exit
Enter choice :2

Enter the Temperature in Celsius(C):12.5C

The Temperature in Fahrenheit(F) is 54.5F

:: Menu ::
1.Fahrenheit to Celsius
2.Celsius to Fahrenheit
3.Exit
Enter choice :3
** Program Exit **

____________Thank You

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