View Compilation Error

0_0_23949654_1.cpp:9:27: error: empty character constant
   for (int i = 1; s[i] != ''; i++) {
                           ^
0_0_23949654_1.cpp: In function 'int main()':
0_0_23949654_1.cpp:7:17: error: too few arguments to function 'char* gets_s(char*, rsize_t)'
  while (gets_s(s)) {
                 ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/stdio.h:959:0,
                 from 0_0_23949654_1.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/sec_api/stdio_s.h:91:25: note: declared here
   _CRTIMP char* __cdecl gets_s(char*,rsize_t);
                         ^
0_0_23949654_1.cpp:17:2: error: expected '}' at end of input
  }
  ^