/in/foo.c:2:1: error: unknown type name 'using'
 using namespace std;
 ^~~~~
/in/foo.c:2:17: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'std'
 using namespace std;
                 ^~~
/in/foo.c: In function 'main':
/in/foo.c:6:2: error: unknown type name 'iny'
  iny temp;
  ^~~
/in/foo.c:7:11: error: expected ')' before numeric constant
  printf(2 5 3);
           ^
/in/foo.c:7:9: warning: passing argument 1 of 'printf' makes pointer from integer without a cast [-Wint-conversion]
  printf(2 5 3);
         ^
In file included from /in/foo.c:1:0:
/usr/include/stdio.h:364:12: note: expected 'const char * restrict' but argument is of type 'int'
 extern int printf (const char *__restrict __format, ...);
            ^~~~~~
/in/foo.c:20:2: error: 'cout' undeclared (first use in this function)
  cout <<a<<" "<<b<<" "<<c<< end1;
  ^~~~
/in/foo.c:20:2: note: each undeclared identifier is reported only once for each function it appears in
/in/foo.c:20:29: error: 'end1' undeclared (first use in this function)
  cout <<a<<" "<<b<<" "<<c<< end1;
                             ^~~~