arodriguez33 · arodriguez33 · commit 6268d3925032 · 2019-01-27T18:49:02.000-03:00
conversion binary to hexadecimal
diff --git a/src/main/java/com/conversions/BinaryToHexadecimal.java b/src/main/java/com/conversions/BinaryToHexadecimal.java
@@ -0,0 +1,42 @@
+package src.main.java.com.conversions;
+
+import java.util.HashMap;
+
+public class BinaryToHexadecimal {
+
+    /**
+     * This method converts a binary number to
+     * a hexadecimal number.
+     *
+     * @param binary The binary number
+     * @return The hexadecimal number
+     */
+
+    public String binToHex(int binary) {
+        //hm to store hexadecimal codes for binary numbers within the range: 0000 to 1111 i.e. for decimal numbers 0 to 15
+        HashMap<Integer,String> hmHexadecimal = new HashMap<>();
+
+        //String to store hexadecimal code
+        String hex="";
+        int i;
+        for(i=0 ; i<10 ; i++)
+            hmHexadecimal.put(i, String.valueOf(i));
+
+        for(i=10 ; i<16 ; i++)
+            hmHexadecimal.put(i,String.valueOf((char)('A'+i-10)));
+
+        int currentbit;
+        while(binary != 0) {
+            int code4 = 0;	//to store decimal equivalent of number formed by 4 decimal digits
+            for(i=0 ; i<4 ; i++)
+            {
+                currentbit = binary % 10;
+                binary = binary / 10;
+                code4 += currentbit * Math.pow(2, i);
+            }
+            hex= hmHexadecimal.get(code4) + hex;
+        }
+        return hex;
+
+    }
+}
diff --git a/src/test/java/com/conversions/BinaryToHexadecimalTest.java b/src/test/java/com/conversions/BinaryToHexadecimalTest.java
@@ -0,0 +1,15 @@
+package src.test.java.com.conversions;
+
+import org.junit.Test;
+import src.main.java.com.conversions.BinaryToHexadecimal;
+import org.junit.Assert;
+
+public class BinaryToHexadecimalTest {
+
+    @Test
+    public void testBinaryToHexadecimal(){
+        BinaryToHexadecimal binaryToHexadecimal = new BinaryToHexadecimal();
+        Assert.assertEquals("Incorrect Conversion", "2A", binaryToHexadecimal.binToHex(101010));
+        Assert.assertEquals("Incorrect Conversion", "24", binaryToHexadecimal.binToHex(100100));
+    }
+}
