View Compilation Error

In file included from 0_0_33145525_2988.cpp:1:0:
0_0_33145525_2988.cpp: In function 'int main()':
0_0_33145525_2988.cpp:6:17: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
  while(gets(a)!=EOF)
                 ^