Also Warnings and Notices

It is possible that the file / folder name contains invalid characters like a space, File and folder names may only contain letters and numbers and not start with a number

When you get something like

filename.test:10: error: expected constructor, destructor, or type conversion before '(' token
expected constructor, destructor, or type conversion before '(' token

Check the part before setup(). Probably there are items which should in setup()

programname:7107:27: error: expected initializer before numeric constant
  const byte variablename value

This can happen when you convert from #define to const . The code should be

const byte variablename = value;

( “=” and “;” added )

expected unqualified-id before 'if'

Maybe you typed a bracket wrong like “{” in stead of “}”

filename:520: error: expected ')' before ';' token

This can be caused by using a ; in

Serial.println(variable A;variable B;variable C;variable D);

The compiler thinks the first ; is the end of the command. The solution is to split the command:

Serial.print(variable A);
Serial.print(";");
Serial.print(variable B);
Serial.print(";");
Serial.print(variable C);
Serial.print(";");
Serial.print(variable D);
Serial.println(";");

The ; is handy when the output has to be imported in a spreadsheet program

/somesketch.ino: In function 'void setup()':
somesketch:7432:38: error: expected ')' before ';' token
   Serial.println(F("sometext");
exit status 1
expected ')' before ';' token

Reason: println(F(something); is not allowed. Only println(something); is. This is not valid for the print(F(something); (without ln) statement

a function-definition is not allowed here before '{' token

Check for missing “}” or “;”'s

Error:

/home/user/sketchbook/someprojectNameTheDirectory
/someprojectName.ino: In function 'void setup()':
someprojectName:7401:5: error: 'functionName or variableName' was not declared in this scope
     ^~~~~~~~~~~~~~~~~~~

exit status 1
'functionName or variableName' was not declared in this scope

Solution: check in the code

• if “functionName or variableName” is declared
• for missing or obsolete (curly)brackets
  

ISO C++ says that these are ambiguous, even though the worst conversion for the first is better than the worst conversion for the second:

Use const char (#define also works but is not advised) instead of const byte for the constant might solve the issue and all the warnings and notices that follow it. Like

note: candidate 1: uint8_t TwoWire::requestFrom(int, int) uint8_t requestFrom(int, int);

The cause seems to be a flaw in the definition of the library

Main subjects on this wiki: Linux, Debian, HTML, Microcontrollers, Privacy

RSS
Disclaimer
Privacy statement
Bugs statement
Cookies
Copyright © : 2014 - 2024 Webevaluation.nl and the authors
Changes reserved.