/in/foo.cc: In function 'int main()':
/in/foo.cc:21:34: error: invalid conversion from 'int*' to 'int' [-fpermissive]
         result[i]=factorial_mod(x);
                                  ^
/in/foo.cc:3:5: note:   initializing argument 1 of 'int factorial_mod(int)'
 int factorial_mod(int x) 
     ^~~~~~~~~~~~~