Add Temperature exercise

Author: phrdang

src/com/codefortomorrow/intermediate/chapter11/practice/Temperature.java

@@ -0,0 +1,32 @@
+package com.codefortomorrow.intermediate.chapter11.practice;
+
+/*
+Write a class that contains the following two methods:
+
+Convert from Celsius to Fahrenheit
+public static double celsiusToFahrenheit(double celsius)
+
+Convert from Fahrenheit to Celsius
+public static double fahrenheitToCelsius(double fahrenheit)
+
+The formula for the conversion is:
+fahrenheit = (9.0 / 5) * celsius + 32
+celsius = (5.0 / 9) * (fahrenheit – 32)
+
+Write a test program that asks the user for a temperature
+in Fahrenheit and prints out the Celsius conversion. Then
+ask the user for a temperature in Celsius and print out
+the Fahrenheit conversion.
+
+Adapted from Exercise 6.8, Introduction to Java Programming (Comprehensive),
+10th ed. by Y. Daniel Liang
+*/
+
+public class Temperature {
+
+    public static void main(String[] args) {
+        // Test your methods here
+    }
+    
+    // Write your methods here
+}

src/com/codefortomorrow/intermediate/chapter11/solutions/Temperature.java

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+package com.codefortomorrow.intermediate.chapter11.solutions;
+
+import java.util.Scanner;
+
+/*
+Write a class that contains the following two methods:
+
+Convert from Celsius to Fahrenheit
+public static double celsiusToFahrenheit(double celsius)
+
+Convert from Fahrenheit to Celsius
+public static double fahrenheitToCelsius(double fahrenheit)
+
+The formula for the conversion is:
+fahrenheit = (9.0 / 5) * celsius + 32
+celsius = (5.0 / 9) * (fahrenheit – 32)
+
+Write a test program that asks the user for a temperature
+in Fahrenheit and prints out the Celsius conversion. Then
+ask the user for a temperature in Celsius and print out
+the Fahrenheit conversion.
+
+Adapted from Exercise 6.8, Introduction to Java Programming (Comprehensive),
+10th ed. by Y. Daniel Liang
+*/
+
+public class Temperature {
+
+    public static void main(String[] args) {
+        Scanner input = new Scanner(System.in);
+        
+        // prompt user for temp in deg F
+        System.out.print("Enter the temperature in degrees Fahrenheit: ");
+        double fahrenheit = input.nextDouble();
+
+        // print that temp in deg C
+        System.out.println(fahrenheit + " deg F is " + fahrenheitToCelsius(fahrenheit) + " deg C");
+
+        // prompt user for temp in deg C
+        System.out.print("Enter the temperature in degrees Celsius: ");
+        double celsius = input.nextDouble();
+        
+        // print that temp in deg F
+        System.out.println(celsius + " deg C is " + celsiusToFahrenheit(celsius) + " deg F");
+        
+        input.close();
+    }
+    
+    /**
+     * Convert from Celsius to Fahrenheit
+     * @param celsius  temperature in degrees Celsius
+     * @return temperature in degrees Fahrenheit
+     */
+    public static double celsiusToFahrenheit(double celsius) {
+        return (9.0 / 5) * celsius + 32;
+    }
+
+    /**
+     * Convert from Fahrenheit to Celsius
+     * @param fahrenheit  temperature in degrees Fahrenheit
+     * @return temperature in degrees Celsius
+     */
+    public static double fahrenheitToCelsius(double fahrenheit) {
+        return (5.0 / 9) * (fahrenheit - 32);
+    }
+}