View Compilation Error

0_0_25621594_10673.cpp: In function 'bool judge()':
0_0_25621594_10673.cpp:16:66: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
  if( (s[1] == '+' || s[1] == '*') || (s[len] == '+' || s[len] == "*")) return false;
                                                                  ^