string comparison

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arduino: 1.6.5 (windows 7), board: "arduino uno"

serialevent.ino: in function 'void loop()':
serialevent:37: error: invalid conversion 'char' 'const char*' [-fpermissive]
in file included c:\program files\arduino\hardware\arduino\avr\cores\arduino/arduino.h:25:0,
                 from serialevent.ino:20:
c:\program files\arduino\hardware\tools\avr\avr\include\string.h:125:12: error:   initializing argument 1 of 'int strcmp(const char*, const char*)' [-fpermissive]
 extern int strcmp(const char *, const char *) __attr_pure__;
            ^
invalid conversion 'char' 'const char*' [-fpermissive]

  report have more information with
  "show verbose output during compilation"
  enabled in file > preferences.

serialevent:37: error: invalid conversion 'char' 'const char*

your 'rack'-variable char (one character). scrcmp() method can compare 2 instances of char* (pointer null-terminated-character-array).

furthermore, never assign value 'rack' variable.


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