Merge pull request TheAlgorithms#314 from NISHITA97/Branch1

Added Binary To Hexadecimal

Author: varunu28

Conversions/BinaryToHexadecimal.java

@@ -0,0 +1,57 @@
+import java.util.*;
+/**
+ * Converts any Binary Number to a Hexadecimal Number
+ * 
+ * @author Nishita Aggarwal
+ *
+ */
+public class BinaryToHexadecimal {
+   
+	/**
+	 * This method converts a binary number to
+	 * a hexadecimal number.
+	 * 
+	 * @param binary The binary number
+	 * @return The hexadecimal number
+	 */ 
+	static 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> hm=new HashMap<>();	
+		//String to store hexadecimal code
+		String hex="";
+		int i;
+		for(i=0 ; i<10 ; i++)
+		{
+			hm.put(i, String.valueOf(i));
+		}
+		for(i=10 ; i<16 ; i++)	hm.put(i,String.valueOf((char)('A'+i-10)));
+		int currbit;
+		while(binary != 0)
+		{
+			int code4 = 0;	//to store decimal equivalent of number formed by 4 decimal digits
+			for(i=0 ; i<4 ; i++)
+			{
+				currbit = binary % 10;
+				binary = binary / 10;
+				code4 += currbit * Math.pow(2, i);
+			}
+			hex= hm.get(code4) + hex;
+		}
+		return hex; 
+	}
+	
+	/**
+	 * Main method
+	 * 
+	 * @param args Command line arguments
+	 */
+	public static void main(String[] args) {
+		Scanner sc = new Scanner(System.in);
+		System.out.println("Enter binary number:");
+		int binary = sc.nextInt();
+		String hex = binToHex(binary);
+		System.out.println("Hexadecimal Code:" + hex);
+		sc.close();
+	}
+}