使 lettercheck 不區分大小寫

Question

所以我需要讓這個代碼能夠計算一個指定的字母（在這種情況下是字母 E）。 我已經做到了計算在句子中輸入了多少次字母的程度，但是它區分大小寫。 現在它只計算大寫 E，可以更改，但我不知道它如何讀取大寫和小寫。

我找到了equalsIgnoreCase()代碼，但是我不熟悉它，所以我不知道把它放在哪里，它是如何工作的，或者它是否會工作。 就我而言，我嘗試了myString.equalsIgnoreCase(MyString2) ，在我的情況下CharCount和CharCountLow我相信。

這是我的代碼：

//Written sentence gets read by arduino when enter is pressed and printed into the serial monitor

//Arduino counts how many characters are in the sentence and prints out that number in serial monitor

//Arduino then counts how many times any chosen letter in the sentence is written, for example E, and then prints out that number on the monitor.

//Arduino then reads the sentence you've written and prints it backwards in serial monitor
char Message[128] = "";
char MessageInversed[128] = "";
static int CharCount;
char NextChar;
char CountChar = 'E';
char CountCharLow = 'e'; // this is what I've tried
int Counter;
boolean Done;

void setup()
{
  // put your setup code here, to run once:
  Serial.begin(9600);
  Serial.println("<Enter your text>");
}
void loop()
{
  Readmessage();
  Showmessage();
}
void Readmessage() 
{
  static int CharCount = 0;
  char EnterCheck = '\n';

  while (Serial.available() > 0 && Done == false)
  {
    NextChar = Serial.read();
    if (NextChar == CountChar || CountCharLow) // this is what I've tried
    {
      Counter++;
    }
    if (NextChar != EnterCheck)
    {
      Message[CharCount] = NextChar;
      CharCount++;
    }
    else
    {
      InverseMessage(CharCount);
      Message[CharCount-1] = '\0';
      CharCount=0;
      Done = true;
    }
  }
}
void InverseMessage(int Characters)
{
for (int InversedCharCount = 0; InversedCharCount < Characters-1; InversedCharCount++)
{   
    MessageInversed[Characters-2-InversedCharCount] = Message[InversedCharCount];
}
    MessageInversed[Characters] = '\0';
}
void Showmessage()
{
  if (Done == true)
  {
    Serial.print("Your message length is: ");
    Serial.println(strlen(Message));
    Serial.print("This is your message: ");
    Serial.println(Message);
    Serial.print("Your inversed message length is: ");
    Serial.println(strlen(MessageInversed));
    Serial.print("Your reversed message is: ");
    Serial.println(MessageInversed);
    if (Counter == 1)
      {
        Serial.print("The letter E has been typed ");
        Serial.print(Counter);
        Serial.println(" time");
      }
      else 
      {
        Serial.print("The letter E has been typed a total of ");
        Serial.print(Counter);
        Serial.println(" times");
      }
    Serial.print("<Please enter next text>");

    Done = false;
    Counter = 0;
  }
}

Answer 1

您需要檢查 NextChar 是否是小寫字母，因此它應該可以通過鍵入：

if(NextChar == CountChar || NextChar == CountCharLow) {...}