1 #include <stdio.h> 2 3 #include <iostream> 4 5 extern "C" int cc_double_value(int value); 6 extern "C" int rust_double_value(int value); 7 main()8int main() { 9 printf("Hello World!\n"); 10 std::cout << "CC: " << cc_double_value(5) << std::endl; 11 std::cout << "Rust: " << rust_double_value(5) << std::endl; 12 return 0; 13 } 14