How do I compare each successive char in a char array with given criteria?

i'm working on project in take given message , convert morse code, in turn arduino spits out beeps. first, tried convert given message (a string) char array using tochararray(). think did wrong; of documentation lingo went on head.

however, still need know how take take each successive character in array , compare each letter of alphabet, can convert proper letter proper sequence of beeps. here's code:

code: [select]


string message = "ad e dac";  //this message anything

const int optopin = 2;
void setup() {
  pinmode(optopin, output);
}
void loop() {
  morsecode(message.tochararray(char[], 20));
 
  delay(5000);
}


void pressbutton(string ditdaw) {   //this part irrelevant now
  if(ditdaw == "dit") {
    digitalwrite(optopin, high);
    delay(100);
    digitalwrite(optopin, low);
    delay(100);
  }
  else if(ditdaw == "daw") {
    digitalwrite(optopin, high);
    delay(300);
    digitalwrite(optopin, low);
    delay(100);
  }
}

void morsecode(char message[20]) {
  for(int x = 0; x < 20; x++) {
   if(message[x] == " ") {
    delay(200);
   }
   else [b]if(message[x] == "a"[/b]) {
     pressbutton(dit);
     pressbutton(daw);
   }
   else if(message[x] == "a") {
     pressbutton(dit);
     pressbutton(daw);
   }
   else if(message[x] == "b") {
     pressbutton(daw);
     pressbutton(dit);
     pressbutton(dit);
     pressbutton(dit);
   }
   else if(message[x] == "b") {
     pressbutton(daw);
     pressbutton(dit);
     pressbutton(dit);
     pressbutton(dit);
   }
   else if(message[x] == "c") {
     pressbutton(daw);
     pressbutton(dit);
     pressbutton(daw);
     pressbutton(dit);
   }
   else if(message[x] == "c") {
     pressbutton(daw);
     pressbutton(dit);
     pressbutton(daw);
     pressbutton(dit);
   }
   else if(message[x] == "d") {
     pressbutton(daw);
     pressbutton(dit);
     pressbutton(dit);
   }
   else if(message[x] == "d") {
     pressbutton(daw);
     pressbutton(dit);
     pressbutton(dit);
   }
}

you idea. plan incorporate equalsignorecase later on, it's not crowded.
but can replace

code: [select]

if(message[x] == "a" make each character in array compared alphabet? , how tochararray() work?

why don't use char array intead of string object? seams easiest way.

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