시간과 공간 그리고 진실의 방

출처: https://jhnyang.tistory.com/193 [양햄찌가 만드는 세상]

정부24 에서 세대주 변경신청을 하면, 변경 대상자에게 문자로 알림이 온다

"정부24 > 서비스 > 세대주 확인 에서 서비스 진위확인" 을 요청한다.

그리고 공동인증서 (구 공인인증서) 혹은 다른 인증수단으로 인증을 통해 로그인 후에 실제로 메뉴를 통해 들어가보면

홈페이지의 서비스 란에 사실/진위확인 이 있다. 여기에 들어가면

이렇게 "세대주 확인" 이 존재한다.

그리고 나서, 변경될 세대주로 다시한번 인증절차를 거치면

이런식으로 세대주 확인이 넘어온 것을 확인할 수 있다.

그리고 "상세" 하단의 확인을 눌러서 내용을 확인하고 변경하면 된다.

Arduino boards have built in support for serial communication on pins 0 and 1, but what if you need more serial ports? The SoftwareSerial Library has been developed to allow serial communication to take place on the other digital pins of your boards, using software to replicate the functionality of the hardwired RX and TX lines. This can be extremely helpful when the need arises to communicate with two serial enabled devices, or to talk with just one device while leaving the main serial port open for debugging purpose.

In the example below, digital pins 10 and 11 on your Arduino boards are used as virtual RX and TX serial lines. The virtual RX pin is set up to listen for anything coming in on via the main serial line, and to then echo that data out the virtual TX line. Conversely, anything received on the virtual RX is sent out over the hardware TX.

Hardware Required

• Arduino Board

Circuit

There is no circuit for this example. Make sure that your Arduino board is attached to your computer via USB to enable serial communication through the serial monitor window of the Arduino Software (IDE).

Schematics

image developed using Fritzing. For more circuit examples, see the Fritzing project page

Code

/*
  Software serial multple serial test

 Receives from the hardware serial, sends to software serial.
 Receives from software serial, sends to hardware serial.

 The circuit:
 * RX is digital pin 2 (connect to TX of other device)
 * TX is digital pin 3 (connect to RX of other device)

 Note:
 Not all pins on the Mega and Mega 2560 support change interrupts,
 so only the following can be used for RX:
 10, 11, 12, 13, 50, 51, 52, 53, 62, 63, 64, 65, 66, 67, 68, 69

 Not all pins on the Leonardo support change interrupts,
 so only the following can be used for RX:
 8, 9, 10, 11, 14 (MISO), 15 (SCK), 16 (MOSI).

 created back in the mists of time
 modified 25 May 2012
 by Tom Igoe
 based on Mikal Hart's example

 This example code is in the public domain.

 */
#include <SoftwareSerial.h>

SoftwareSerial mySerial(2, 3); // RX, TX

void setup()
{
  // Open serial communications and wait for port to open:
  Serial.begin(115200);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for Native USB only
  }


  Serial.println("Goodnight moon!");

  // set the data rate for the SoftwareSerial port
  mySerial.begin(38400);
  mySerial.println("Hello, world?");
}

void loop() // run over and over
{
  if (mySerial.available())
    Serial.write(mySerial.read());
  if (Serial.available())
    mySerial.write(Serial.read());
}

www.arduino.cc/en/Tutorial/LibraryExamples/SoftwareSerialExample

rasino.tistory.com/203

In this blog post, we will see the C program to convert Hexadecimal to Decimal. In the interview, people ask the below questions,

• How will you convert hexadecimal to decimal value?
• Write a C program to convert hexadecimal number system value to decimal number system?
• Implement logic to convert a hexadecimal number to a decimal number system?
• Get a hexadecimal number from the user and convert it to its decimal equivalent?

Examples:

Input : 67

Output : 103

Input : 512

Output : 1298

Input: 123

Output: 291

We need to know the decimal and hexadecimal numbers before writing the C program to convert hexadecimal to the decimal.

The hexadecimal number system is a base 16 number system. The hexadecimal number is represented by 16 values i.e 0 1 2 3 4 5 6 7 8 9 A B C D E F.

The decimal number system is a base 10 number system. It uses 10 symbols to represent all numbers i.e. 0123456789

Logic to convert Hexadecimal to Decimal System:

We know that in hexadecimal number uses 16 symbols {0, 1, 2, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F} to represent all numbers. Here, (A, B, C, D, E, F) represents (10, 11, 12, 13, 14, 15).

We need to run a loop from 0 to  (buffer_length -1). The buffer_length  is the length of the buffer which contains entered hexadecimal number.

To convert hex to decimal, we need to extract the digits of a given hexadecimal number from the buffer. At the time of extracting digits from the hexadecimal number, multiply the digit with the proper base (Power of 16) and add it to the variable “decimal”.

After ending the iteration, the variable “decimal” will store the resultant decimal number.

For Example:
If the hexadecimal number is 1A.
decimal = 1*(16^1) + 10*(16^0) = 26

Below diagram explains how to convert hexadecimal number ( 1AB ) to equivalent decimal value:

C Program to convert hexadecimal to decimal number system:

#include <stdio.h>
#include <math.h>
#include <string.h>
#define ARRAY_SIZE  20
int main()
{
    char hex[ARRAY_SIZE];
    long long decimal = 0, base = 1;
    int i = 0, value, length;
    /* Get hexadecimal value from user */
    printf("Enter hexadecimal number: ");
    fflush(stdin);
    fgets(hex,ARRAY_SIZE,stdin);
    length = strlen(hex);
    for(i = length--; i >= 0; i--)
    {
        if(hex[i] >= '0' && hex[i] <= '9')
        {
            decimal += (hex[i] - 48) * base;
            base *= 16;
        }
        else if(hex[i] >= 'A' && hex[i] <= 'F')
        {
            decimal += (hex[i] - 55) * base;
            base *= 16;
        }
        else if(hex[i] >= 'a' && hex[i] <= 'f')
        {
            decimal += (hex[i] - 87) * base;
            base *= 16;
        }
    }
    printf("\nHexadecimal number = %s", hex);
    printf("Decimal number = %lld\n", decimal);
    return 0;
}

Enter hexadecimal number: 1A
Hexadecimal number = 1A
Decimal number = 26