/in/foo.c:2:1: error: unknown type name 'using'
    2 | using namespace std;
      | ^~~~~
/in/foo.c:2:17: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'std'
    2 | using namespace std;
      |                 ^~~
/in/foo.c: In function 'main':
/in/foo.c:11:18: error: lvalue required as left operand of assignment
   11 |            if(x%i=0)
      |                  ^
/in/foo.c:15:10: error: 'cout' undeclared (first use in this function)
   15 |          cout<<"sum="<<sum<<endl;
      |          ^~~~
/in/foo.c:15:10: note: each undeclared identifier is reported only once for each function it appears in
/in/foo.c:15:29: error: 'endl' undeclared (first use in this function)
   15 |          cout<<"sum="<<sum<<endl;
      |                             ^~~~
/in/foo.c:18:1: error: expected declaration or statement at end of input
   18 | }
      | ^