View Compilation Error

0_0_24418565_31437.cpp: In function 'int main()':
0_0_24418565_31437.cpp:29:10: error: too few arguments to function 'int fflush(FILE*)'
   fflush();
          ^
In file included from 0_0_24418565_31437.cpp:1:0:
GCC4.9.2/x86_64-w64-mingw32/include/stdio.h:437:15: note: declared here
   int __cdecl fflush(FILE *_File);
               ^