Added a code

Hexadecimal to binary convertor.

Author: BASU4100

Vivek Kumar

@@ -0,0 +1,90 @@
+// C++ program to convert
+// Hexadecimal number to Binary
+
+#include <bits/stdc++.h>
+using namespace std;
+
+// function to convert
+// Hexadecimal to Binary Number
+void HexToBin(string hexdec)
+{
+	long int i = 0;
+
+	while (hexdec[i]) {
+
+		switch (hexdec[i]) {
+		case '0':
+			cout << "0000";
+			break;
+		case '1':
+			cout << "0001";
+			break;
+		case '2':
+			cout << "0010";
+			break;
+		case '3':
+			cout << "0011";
+			break;
+		case '4':
+			cout << "0100";
+			break;
+		case '5':
+			cout << "0101";
+			break;
+		case '6':
+			cout << "0110";
+			break;
+		case '7':
+			cout << "0111";
+			break;
+		case '8':
+			cout << "1000";
+			break;
+		case '9':
+			cout << "1001";
+			break;
+		case 'A':
+		case 'a':
+			cout << "1010";
+			break;
+		case 'B':
+		case 'b':
+			cout << "1011";
+			break;
+		case 'C':
+		case 'c':
+			cout << "1100";
+			break;
+		case 'D':
+		case 'd':
+			cout << "1101";
+			break;
+		case 'E':
+		case 'e':
+			cout << "1110";
+			break;
+		case 'F':
+		case 'f':
+			cout << "1111";
+			break;
+		default:
+			cout << "\nInvalid hexadecimal digit "
+				<< hexdec[i];
+		}
+		i++;
+	}
+}
+
+// driver code
+int main()
+{
+
+	// Get the Hexadecimal number
+	char hexdec[100] = "1AC5";
+
+	// Convert HexaDecimal to Binary
+	cout << "\nEquivalent Binary value is : ";
+	HexToBin(hexdec);
+
+	return 0;
+}