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10¿Ê¿ô(decimal number)¤Î0-15¤ò°ú¿ô¤Ë¼è¤ê¡¢16¿Ê¿ô(hexadecimal number)¤Î0-F¤òÊÖ¤¹´Ø¿ôdtoh¤ò¹Í¤¨¤Æ¤ß¤Þ¤¹¡£¸À¸ì¤Ï²¿¤òÁª¤ó¤Ç¤â¤è¤¤¤Î¤Ç¤¹¤¬¡¢¤ï¤±¤¢¤Ã¤Æ¤³¤³¤Ç¤ÏC¸À¸ì¤Ç½ñ¤¯¤³¤È¤Ë¤·¤Þ¤¹¡£

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char dtoh1(int num) {
  switch(num) {
  case 0:
    return '0';
  case 1:
    return '1';
  case 2:
    return '2';
  case 3:
    return '3';
  case 4:
    return '4';
  case 5:
    return '5';
  case 6:
    return '6';
  case 7:
    return '7';
  case 8:
    return '8';
  case 9:
    return '9';
  case 10:
    return 'A';
  case 11:
    return 'B';
  case 12:
    return 'C';
  case 13:
    return 'D';
  case 14:
    return 'E';
  case 15:
    return 'F';
  default:
    return 'Z';
  }
}

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char dtoh2(int num) {
  if(num<10) return ('0' + num);
  switch(num) {
  case 10:
    return 'A';
  case 11:
    return 'B';
  case 12:
    return 'C';
  case 13:
    return 'D';
  case 14:
    return 'E';
  case 15:
    return 'F';
  default:
    return 'Z';
  }
}

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char dtoh3(int num) {
  char str[] = {
    '0', '1', '2', '3', '4',
    '5', '6', '7', '8', '9',
    'A', 'B', 'C', 'D', 'E', 'F'};
  return str[num];
}

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char dtoh4(int num) {
  return "0123456789ABCDEF"[num];
}

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