C 将十进制 scanf 输入转换为二进制数组

Question

我正在开发一个程序，让我的 RaspPi 驱动旧的 HP 十六进制显示器。我目前使用外壳/开关选项来控制 GPIO 输出选择。我想使用直接二进制输入。如何将十进制 scanf() 输入转换为二进制数组？

    #include <stdio.h>
#include <stdlib.h>
#include <wiringPi.h>


int main()
{

 int displayNumber;

  wiringPiSetup();

  pinMode(0, OUTPUT);
  pinMode(1, OUTPUT);
  pinMode(2, OUTPUT);
  pinMode(3, OUTPUT);
  pinMode(6, OUTPUT);

  digitalWrite(0, LOW);
  digitalWrite(1, LOW);
  digitalWrite(2, LOW);
  digitalWrite(3, LOW);
  digitalWrite(6, LOW);

    printf("Please select a number to display! 0-9\n");

    scanf("%i", &displayNumber);


   switch (displayNumber) {

    case 0:
    digitalWrite(6, LOW);
    digitalWrite(3, LOW);
    digitalWrite(0, LOW);
    digitalWrite(1, LOW);
    digitalWrite(2, LOW);
    digitalWrite(6, HIGH);
    break;

    case 1:
    digitalWrite(6, LOW);
    digitalWrite(3, HIGH);
    digitalWrite(0, LOW);
    digitalWrite(1, LOW);
    digitalWrite(2, LOW);
    digitalWrite(6, HIGH);
    break;

    case 2:
    digitalWrite(6, LOW);
    digitalWrite(3, HIGH);
    digitalWrite(0, LOW);
    digitalWrite(1, LOW);
    digitalWrite(2, LOW);
    digitalWrite(6, HIGH);
    // code
    break;

    case 3:
    digitalWrite(6, LOW);
    digitalWrite(3, HIGH);
    digitalWrite(0, HIGH);
    digitalWrite(1, LOW);
    digitalWrite(2, LOW);
    digitalWrite(6, HIGH);
    // Code
    break;

    case 4:
    digitalWrite(6, LOW);
    digitalWrite(3, LOW);
    digitalWrite(0, LOW);
    digitalWrite(1, HIGH);
    digitalWrite(2, LOW);
    digitalWrite(6, HIGH);

    break;

    case 5:
    digitalWrite(6, LOW);
    digitalWrite(3, HIGH);
    digitalWrite(0, LOW);
    digitalWrite(1, HIGH);
    digitalWrite(2, LOW);
    digitalWrite(6, HIGH);

    break;

    case 6:
    digitalWrite(6, LOW);
    digitalWrite(3, LOW);
    digitalWrite(0, HIGH);
    digitalWrite(1, HIGH);
    digitalWrite(2, LOW);
    digitalWrite(6, HIGH);

    break;
    case 7:
    digitalWrite(6, LOW);
    digitalWrite(3, HIGH);
    digitalWrite(0, HIGH);
    digitalWrite(1, HIGH);
    digitalWrite(2, LOW);
    digitalWrite(6, HIGH);

    break;
    case 8:
    digitalWrite(6, LOW);
    digitalWrite(3, LOW);
    digitalWrite(0, LOW);
    digitalWrite(1, LOW);
    digitalWrite(2, HIGH);
    digitalWrite(6, HIGH);

    break;
    case 9:
    digitalWrite(6, LOW);
    digitalWrite(3, HIGH);
    digitalWrite(0, LOW);
    digitalWrite(1, LOW);
    digitalWrite(2, HIGH);
    digitalWrite(6, LOW);
    break;
    }



return 0;

}

Answer 1

将 switch 语句替换为

digitalWrite(6, LOW);
digitalWrite(3, displayNumber & 1 ? HIGH : LOW);
digitalWrite(0, displayNumber & 2 ? HIGH : LOW);
digitalWrite(1, displayNumber & 4 ? HIGH : LOW);
digitalWrite(2, displayNumber & 8 ? HIGH : LOW);
digitalWrite(6, HIGH);