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/*fileName:P5Q07.java
*Name:Wang Chaoran
* Description:

7 (Conversions between Celsius and Fahrenheit)
Write a class that contains the following two methods:

//Converts from Celsius to Fahrenheit //
public static double celsiusToFahrenheit(double celsius)

//Converts from Fahrenheit to Celsius //
public static double fahrenheitToCelsius(double fahrenheit)

The formula for the conversion is:

fahrenheit = (9.0 / 5) * celsius + 32

Write a test program that invokes these methods to display the following tables:

 
Celsius    Fahrenheit    Fahrenheit    Celsius
 40.0      105.0         120.0         48.89
 39.0      102.2         110.0         43.33
  ...
 32.0       89.6          40.0          5.44
 31.0       87.8          30.0         -1.11
*/
import java.util.Scanner;
public class P5Q07{
 
  public static void main(String[] args){
    System.out.println("Celsius    Fahrenheit    Fahrenheit    Celsius");
    for(double i = 40.0;i >= 31.0;i -= 1.0){
      System.out.print(" "+i+"      ");
     
      System.out.printf("%5.1f",celsiusToFahrenheit(i));
     
      System.out.print("         "+(i-28)*10+"         ");
      if((i-28)*10<100)
        System.out.print(" ");
      System.out.printf("%5.2f",fahrenheitToCelsius((i-28)*10));
      System.out.println();
    }
  }
 
  public static double celsiusToFahrenheit(double celsius){
    return (9.0 / 5) * celsius + 32;
  }
 
  public static double fahrenheitToCelsius(double fahrenheit){
    return (fahrenheit - 32) * 5 / 9.0;
}
 
}

//fahrenheit = 120; (in the loop )fahrenheit -= 10; printf("%3d%4d%4d%8d",kjsdf,ksdf,ksdf,jksdf);or use while(celsius >=31.o){ celsius--;}