Temperature conversion added to conversions - issue#5042

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

@@ -0,0 +1,100 @@
+package com.thealgorithms.conversions;
+
+/**
+ * Convets the temperatures from user to Celsius/Fahrenheit/Kelvin
+ *
+ * @author Tharun S.M.
+ */
+
+public class TemperatureConversion {
+    private static final double CELSIUS_SLOPE = 1.0;
+    private static final double CELSIUS_INTERCEPT = 0.0;
+    private static final double FAHRENHEIT_SLOPE = 1.8;
+    private static final double FAHRENHEIT_INTERCEPT = 32.0;
+    private static final double KELVIN_SLOPE = 1.0;
+    private static final double KELVIN_INTERCEPT = 273.15;
+
+    /**
+     * This function convert current temperature type to required temperature type
+     *
+     * @param temperature double, fromType String & toType String
+     * @return double
+     */
+    public static double convertTemperature(double temperature, String fromType, String toType) {
+
+        if (fromType.equalsIgnoreCase(toType)) {
+            return temperature;
+        }
+
+        double[] slopeAndIntercept = getSlopeAndIntercept(fromType, toType);
+
+        double fromSlope = slopeAndIntercept[0];
+        double fromIntercept = slopeAndIntercept[1];
+        double toSlope = slopeAndIntercept[2];
+        double toIntercept = slopeAndIntercept[3];
+        // converting to celsius temperature first, then to our required temperature
+        double celsiusTemperature = (temperature - fromIntercept) / fromSlope;
+        return celsiusTemperature * toSlope + toIntercept;
+    }
+
+    /**
+     * This function returns Slopes and Intercepts of from and to temperature types
+     *
+     * @param fromType String & toType String
+     * @return double array of Slopes and Intercepts
+     */
+    public static double[] getSlopeAndIntercept(String fromType, String toType) {
+
+        double[] slopeAndIntercept = new double[4];
+        if (fromType.equalsIgnoreCase("Celsius") && toType.equalsIgnoreCase("Fahrenheit")) {
+            slopeAndIntercept[0] = CELSIUS_SLOPE;
+            slopeAndIntercept[1] = CELSIUS_INTERCEPT;
+            slopeAndIntercept[2] = FAHRENHEIT_SLOPE;
+            slopeAndIntercept[3] = FAHRENHEIT_INTERCEPT;
+            return slopeAndIntercept;
+        } else if (fromType.equalsIgnoreCase("Fahrenheit") && toType.equalsIgnoreCase("Celsius")) {
+            slopeAndIntercept[0] = FAHRENHEIT_SLOPE;
+            slopeAndIntercept[1] = FAHRENHEIT_INTERCEPT;
+            slopeAndIntercept[2] = CELSIUS_SLOPE;
+            slopeAndIntercept[3] = CELSIUS_INTERCEPT;
+            return slopeAndIntercept;
+        } else if (fromType.equalsIgnoreCase("Celsius") && toType.equalsIgnoreCase("Kelvin")) {
+            slopeAndIntercept[0] = CELSIUS_SLOPE;
+            slopeAndIntercept[1] = CELSIUS_INTERCEPT;
+            slopeAndIntercept[2] = KELVIN_SLOPE;
+            slopeAndIntercept[3] = KELVIN_INTERCEPT;
+            return slopeAndIntercept;
+        } else if (fromType.equalsIgnoreCase("Kelvin") && toType.equalsIgnoreCase("Celsius")) {
+            slopeAndIntercept[0] = KELVIN_SLOPE;
+            slopeAndIntercept[1] = KELVIN_INTERCEPT;
+            slopeAndIntercept[2] = CELSIUS_SLOPE;
+            slopeAndIntercept[3] = CELSIUS_INTERCEPT;
+            return slopeAndIntercept;
+        } else if (fromType.equalsIgnoreCase("Kelvin") && toType.equalsIgnoreCase("Fahrenheit")) {
+            slopeAndIntercept[0] = KELVIN_SLOPE;
+            slopeAndIntercept[1] = KELVIN_INTERCEPT;
+            slopeAndIntercept[2] = FAHRENHEIT_SLOPE;
+            slopeAndIntercept[3] = FAHRENHEIT_INTERCEPT;
+            return slopeAndIntercept;
+        } else if (fromType.equalsIgnoreCase("Fahrenheit") && toType.equalsIgnoreCase("Kelvin")) {
+            slopeAndIntercept[0] = FAHRENHEIT_SLOPE;
+            slopeAndIntercept[1] = FAHRENHEIT_INTERCEPT;
+            slopeAndIntercept[2] = KELVIN_SLOPE;
+            slopeAndIntercept[3] = KELVIN_INTERCEPT;
+            return slopeAndIntercept;
+        } else {
+            throw new IllegalArgumentException("Unsupported temperature conversion");
+        }
+    }
+
+    public static void main(String[] args) {
+
+        double temperature = 100;
+        String fromType = "Celsius";
+        String toType = "Fahrenheit";
+
+        double convertedTemperature = convertTemperature(temperature, fromType, toType);
+
+        System.out.println("Converted temperature: " + convertedTemperature);
+    }
+}

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;
+
+class TemperatureConversionTest {
+
+    @Test
+    void testTemperatureConversion() {
+        assertEquals(326.15, TemperatureConversion.convertTemperature(53, "Celsius", "Kelvin"));
+        assertEquals(127.4, TemperatureConversion.convertTemperature(53, "Celsius", "Fahrenheit"));
+        assertEquals(-220.14999999999998, TemperatureConversion.convertTemperature(53, "Kelvin", "Celsius"));
+        assertEquals(-364.27, TemperatureConversion.convertTemperature(53, "Kelvin", "Fahrenheit"));
+        assertEquals(11.666666666666666, TemperatureConversion.convertTemperature(53, "Fahrenheit", "Celsius"));
+        assertEquals(284.81666666666666, TemperatureConversion.convertTemperature(53, "Fahrenheit", "Kelvin"));
+    }
+}