Temperature conversion added to conversions - issue#5042

src/main/java/com/thealgorithms/conversions/TemperatureConversion.java

@@ -0,0 +1,149 @@
+package com.thealgorithms.conversions;
+
+import java.text.DecimalFormat;
+import java.util.Scanner;
+/**
+ * Convets the temperatures from user to Celsius/Fahrenheit/Kelvin
+ *
+ * @author Tharun S.M.
+ */
+
+public class TemperatureConversion {
+    /*
+     * Object of DecimalFormat Class
+     * to round the output to 2 decimal point value
+     */
+    private static final DecimalFormat rnd = new DecimalFormat("0.00");
+    /*
+     * Main method
+     *
+     * @param args Command line arguments
+     */
+
+    public static void main(String[] args) {
+
+        Scanner sc = new Scanner(System.in);
+
+        // Get the type of temprature input
+        System.out.println("Enter the temperature input type (use numbers)");
+        System.out.println("1 => Celsius");
+        System.out.println("2 => Fahrenheit");
+        System.out.println("3 => Kelvin");
+        int fromType = sc.nextInt();
+
+        // get the actual temprature
+        System.out.println("Enter the temperature :");
+        String a = sc.next();
+        float inTemp = Float.parseFloat(a);
+
+        // get the type you want to convert your temperature to
+        System.out.println("Type you want to convert your temperature to (use numbers)");
+        System.out.println("1 => Celsius");
+        System.out.println("2 => Fahrenheit");
+        System.out.println("3 => Kelvin");
+        int toType = sc.nextInt();
+
+        if (fromType == toType) {
+            System.out.println("Your Temperature is the same !!");
+        } else if (fromType == 1 && toType == 2) {
+            System.out.println("Converted value: " + convertCelsiusToFahrenheit(inTemp) + " °F");
+        } else if (fromType == 1 && toType == 3) {
+            System.out.println("Converted value: " + convertCelsiusToKelvin(inTemp) + " K");
+        } else if (fromType == 2 && toType == 1) {
+            System.out.println("Converted value: " + convertFahrenheitToCelsius(inTemp) + " °C");
+        } else if (fromType == 2 && toType == 3) {
+            System.out.println("Converted value: " + convertFahrenheitToKelvin(inTemp) + " K");
+        } else if (fromType == 3 && toType == 1) {
+            System.out.println("Converted value: " + convertKelvinToCelsius(inTemp) + " °C");
+        } else if (fromType == 3 && toType == 2) {
+            System.out.println("Converted value: " + convertKelvinToFahrenheit(inTemp) + " °F");
+        } else {
+            System.out.println("Please check your input and output types");
+        }
+        sc.close();
+    }
+
+    /**
+     * This method converts a Kelvin to Celsius.
+     *
+     * @param param float paramter
+     * @return String
+     */
+    public static String convertKelvinToCelsius(float inTemp) {
+
+        double result = 0;
+        result = inTemp - 273.15;
+        return rnd.format(result);
+    }
+
+    /**
+     * This method converts a Kelvin to Fahrenheit.
+     *
+     * @param param float paramter
+     * @return String
+     */
+    public static String convertKelvinToFahrenheit(float inTemp) {
+
+        double result = 0;
+        result = (inTemp * 1.8) - 459.67;
+        return rnd.format(result);
+    }
+
+    /**
+     * This method converts a Fahrenheit to Kelvin.
+     *
+     * @param param float paramter
+     * @return String
+     */
+    public static String convertFahrenheitToKelvin(float inTemp) {
+
+        double result = 0;
+        result = (inTemp + 459.67) / 1.8;
+        return rnd.format(result);
+    }
+
+    /**
+     * This method converts a Fahrenheit to Kelvin.
+     *
+     * @param param float paramter
+     * @return String
+     */
+    public static String convertFahrenheitToCelsius(float inTemp) {
+
+        double result = 0;
+        result = (inTemp - 32) / 1.8;
+        return rnd.format(result);
+    }
+
+    /**
+     * This method converts a Celsius to Fahrenheit.
+     *
+     * @param param float paramter
+     * @return String
+     */
+    public static String convertCelsiusToFahrenheit(float inTemp) {
+
+        double result = 0;
+        result = (inTemp * 1.8) + 32;
+        return rnd.format(result);
+    }
+
+    /**
+     * This method converts a Celsius to Kelvin.
+     *
+     * @param param float paramter
+     * @return String
+     */
+    public static String convertCelsiusToKelvin(float inTemp) {
+
+        double result = 0;
+        result = inTemp + 273.15;
+        return rnd.format(result);
+    }
+
+    /*
+     * Reference URL : https://en.wikipedia.org/wiki/Conversion_of_scales_of_temperature
+     * This is not the most effecient method for Temp conversion But its easy to
+     * understand and straight forward
+     */
+}

src/test/java/com/thealgorithms/conversions/TemperatureConversionTest.java

@@ -0,0 +1,18 @@
+package com.thealgorithms.conversions;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.junit.jupiter.api.Test;
+
+public class TemperatureConversionTest {
+
+    @Test
+    public void testTemperatureConversion() {
+        assertEquals("326.15", TemperatureConversion.convertCelsiusToKelvin(53));
+        assertEquals("89.60", TemperatureConversion.convertCelsiusToFahrenheit(32));
+        assertEquals("179.85", TemperatureConversion.convertKelvinToCelsius(453));
+        assertEquals("137.93", TemperatureConversion.convertKelvinToFahrenheit(332));
+        assertEquals("8.33", TemperatureConversion.convertFahrenheitToCelsius(47));
+        assertEquals("273.71", TemperatureConversion.convertFahrenheitToKelvin(33));
+    }
+}