View Compilation Error

0_0_38577289_18111.cpp: In function 'int hanoi(int)':
0_0_38577289_18111.cpp:8:12: error: a function-definition is not allowed here before '{' token
 int main() {
            ^
0_0_38577289_18111.cpp:16:1: error: expected '}' at end of input
 }
 ^
0_0_38577289_18111.cpp:4:18: note: to match this '{'
 int hanoi(int n) {
                  ^