View Compilation Error

In file included from 0_0_19413535_7948.cpp:1:0:
0_0_19413535_7948.cpp: In function 'int main()':
0_0_19413535_7948.cpp:7:22: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
  while (gets(str) != EOF)
                      ^