View Compilation Error

In file included from 0_0_16043063_6368.cpp:1:0:
0_0_16043063_6368.cpp: In function 'int main()':
0_0_16043063_6368.cpp:7:19: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
    while(gets(a)!=EOF)
                   ^