View Compilation Error

In file included from 0_0_36995283_21230.cpp:1:0:
0_0_36995283_21230.cpp: In function 'int main()':
0_0_36995283_21230.cpp:7:18: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
  while(gets(ch)!=EOF)//输入英文语句 
                  ^