View Compilation Error

In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/cstdio:42:0,
                 from 0_0_30411243_32707.cpp:1:
0_0_30411243_32707.cpp: In function 'int main()':
0_0_30411243_32707.cpp:51:23: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
     while (gets(s) != EOF) {
                       ^