Help in Arduino Codes

Development Boards Arduino
1

hi sir/ma’am how to convert a char to a string?

i got this error.

sketch_aug27a:90: error: invalid conversion from ‘char’ to ‘const char*’

sketch_aug27a:90: error: initializing argument 1 of ‘String::String(const char*)’

sketch_aug27a:93: error: invalid conversion from ‘char’ to ‘const char*’

sketch_aug27a:93: error: initializing argument 1 of ‘unsigned char String::equals(const char*) const’

char x;
n[20];

     
      if((x, n)>0)   // Number, Number length
      {
      String num=x;
      if(num.equals("12345")){
      Serial.print("Ok");
     }
     else{
     Serial.print("Done");
}
2

The above code has many errors and I’m sure is not giving you the error messages you’ve listed.

  1. What kind of array is n ? It’s not declared.

  2. What’s this supposed to do … if((x, n)>0) … ?

  3. You’re missing a brace, }. Where is it supposed to go ?

  4. Is x really a type char or do you want it to be an array of characters, up to 20 characters long ? Is n = 20 ?

Post all your code and it’ll make more sense to us.

3

char2str() ?

4

I tried using the String class (not strings) a couple of years ago and ran into nothing but weird problems. As I later found out the String class in ArduinoLand is not well implemented and the more experienced people I could find then said “Stay away from Strings”. That is, use strings instead. I have a guess as the what the OP was trying to do with the entirety of his code based upon the snippet he gave us. I believe it can be done simply, a number of ways, w/o Strings. But the OP needs to post his code and tell us what it is intended to do so all the guessing is not needed.