day 16a complete

shared/Binary.go

@@ -0,0 +1,42 @@
+package shared
+
+import "math"
+
+func BinaryToInteger(binaryString *string) (value int) {
+	n := 0
+	for i := len(*binaryString) - 1; i >= 0; i-- {
+		if (*binaryString)[i] == '1' {
+			value += (int(math.Pow(float64(2), float64(n))))
+		}
+		n++
+	}
+	return
+}
+
+func HexToBinary(hexString *string) (binary string) {
+	hexMap := make(map[string]string)
+
+	hexMap["0"] = "0000"
+	hexMap["1"] = "0001"
+	hexMap["2"] = "0010"
+	hexMap["3"] = "0011"
+	hexMap["4"] = "0100"
+	hexMap["5"] = "0101"
+	hexMap["6"] = "0110"
+	hexMap["7"] = "0111"
+	hexMap["8"] = "1000"
+	hexMap["9"] = "1001"
+	hexMap["A"] = "1010"
+	hexMap["B"] = "1011"
+	hexMap["C"] = "1100"
+	hexMap["D"] = "1101"
+	hexMap["E"] = "1110"
+	hexMap["F"] = "1111"
+
+	for _, hex := range *hexString {
+		binary = binary + hexMap[string(hex)]
+	}
+
+	return
+
+}