Simple Java program to convert Celsius degrees to Fahrenheit degrees and Fahrenheit degrees to Celsius degrees.

import java.util.Scanner;

//© 2017 TheFlyingKeyboard and released under MIT License
//theflyingkeyboard.net

public class CelsiusFahrenheit {
  public static void main(String[] args) {
      Scanner input = new Scanner(System.in);
      
      char choice;
      double temperature;
      
      System.out.println("C - convert Celsius to Fahrenheit, F - convert Fahrenheit to Celsius");
      choice = input.next().charAt(0);
      choice = Character.toLowerCase(choice);
      
      System.out.print("Enter temperature value: ");
      temperature = input.nextDouble();
      
      if(choice == 'c'){
      	System.out.println(temperature + " degrees Celsius is equal to " + CelsiusToFahrenheit(temperature) + " degrees Fahrenheit");
      }else{
      	System.out.println(temperature + " degrees Fahrenheit is equal to " + FahrenheitToCelsius(temperature) + " degrees Celsius");
      }
  }
  
  static double CelsiusToFahrenheit(double n)
    {
        return (n * 1.8 + 32);
    }

    static double FahrenheitToCelsius(double n)
    {
        return ((n - 32) / 1.8);
    }
}

 



Java Conversion Between Celsius And Fahrenheit Degrees
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