View Compilation Error

0_0_38614392_29700.cpp: In function 'int main()':
0_0_38614392_29700.cpp:5:22: error: 'factorial' was not declared in this scope
         int result = factorial(n);
                      ^~~~~~~~~
0_0_38614392_29700.cpp:5:22: note: suggested alternative: '_atoi_l'
         int result = factorial(n);
                      ^~~~~~~~~
                      _atoi_l