View Compilation Error

0_0_38529696_2953.cpp:14:11: error: '::main' must return 'int'
 void main() {
           ^
0_0_38529696_2953.cpp: In function 'int main()':
0_0_38529696_2953.cpp:18:14: error: 'n' was not declared in this scope
   printf(Fib(n));
              ^