View Compilation Error

0_0_32287210_18510.cpp: In function 'int main()':
0_0_32287210_18510.cpp:7:21: error: too many arguments to function 'int fun()'
  printf("%d\n",fun(n));
                     ^
0_0_32287210_18510.cpp:2:5: note: declared here
 int fun();
     ^