foo.cc:17:12: error: stray '#' in program
      a = c;#include <iostream>
            ^
foo.cc: In function 'int main()':
foo.cc:17:13: error: 'include' was not declared in this scope
      a = c;#include <iostream>
             ^~~~~~~
foo.cc:17:30: error: expected primary-expression before '>' token
      a = c;#include <iostream>
                              ^
foo.cc:19:1: error: expected primary-expression before 'using'
 using namespace std;
 ^~~~~
foo.cc:21:1: error: a function-definition is not allowed here before '{' token
 {
 ^

[Hydro](https://hydro.ac)提供评测服务