Compile and Execute Swift Online

import Foundation
import Glibc

extension Data {
    func subdata(in range: ClosedRange<Index>) -> Data {
        return subdata(in: range.lowerBound ..< range.upperBound + 1)
    }
}

var test = "122"
var test_int16 = Int16(test)
var data_byte = Data(buffer: UnsafeMutableBufferPointer(start: &test, count: 1))

print("data_byte: ",data_byte)

// var data_test_byte = data_byte.subdata(in:0...1)
// print("data_test_byte: ",data_test_byte)

// var data = Data(buffer: UnsafeMutableBufferPointer(start: &data_byte[0], count: 2))

// data_test_byte = data.subdata(in:0...1)
// print("data_byte: ",Int16(data_test_byte))

let number = data_byte.withUnsafeBytes {
                            (pointer: UnsafePointer<Int8>) -> Int8 in
    return pointer.pointee
}

print(number)


// print("data_byte: ",Int8(data_test_byte[0]))
// print("data_byte: ",data_test_byte[1])


// var index = Int8(0)
// //var data_time = dataTimeFormat(timeStr: dataTime)
// var info = Data(buffer: UnsafeMutableBufferPointer(start: &index, count: 0))

// var data1 = Int8(1)
// let data1_byte = Data(buffer: UnsafeMutableBufferPointer(start: &data1, count: 1))

// var data2 = Int8(1)
// let data2_byte = Data(buffer: UnsafeMutableBufferPointer(start: &data2, count: 1))

// info.append(contentsOf: data1_byte)
// info.append(contentsOf: data2_byte)
// info.append(contentsOf: data2_byte)
// info.append(contentsOf: data2_byte)

// print("info: ",info.subdata(in:0...2))


// var a = Double(-0.75)
// // var b = Int16(a*100)

// let acc_int16_byte = Data(buffer: UnsafeMutableBufferPointer(start: &a, count: 1))
// // print("Acc byte: ",acc_int16_byte)
// info.append(contentsOf: acc_int16_byte)
    
            
// if info.count != 0{
//     var data_byte = start_int8_byte
// var data = Data(buffer: UnsafeMutableBufferPointer(start: &acc_int16_byte, count: 1))
// print("data_byte: ",acc_int16_byte)
// print("data: ",data)
    
//     let a = Int8(data[0])
//     print("a: ",a)
    
// }