View Compilation Error

0_0_31415238_18390.cpp: In function 'int main()':
0_0_31415238_18390.cpp:9:17: error: too few arguments to function 'int putchar(int)'
         putchar();
                 ^
In file included from 0_0_31415238_18390.cpp:1:0:
GCC4.9.2/x86_64-w64-mingw32/include/stdio.h:503:15: note: declared here
   int __cdecl putchar(int _Ch);
               ^