Serial Read, String, Convert ATOI

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hey guys, not sure if popular subject have tried looking through google "arduino read string serial convert integer" because issue having number entered in serial user , having character/string converted actual number. code having problems shown below

code: [select]
char c = serial.read();
  readstring.indexof(c); //i have tried using readstring.concat(c) append
int n;
n = atoi(readstring); //convert string number


the error "error: cannot convert 'string' 'const char*' argument '1' 'int atoi(const char*)'". so, unsure of doing wrong. did try

code: [select]
char *c = serial.read(); , arduino did not either. appreciated.

http://arduino.cc/en/reference/stringtochararray ?


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