#ifdef _cplusplus
      #include <iostream>
      #define print() int main(){cout << "Hello world! -- from C++" << endl;}
  #elif (defined __STDC__) || (defined __STDC_VERSION__)
      #include <stdio.h>
      #define print() int main(){printf("Hello world! -- from C\n");}
  #else
  import builtins
  print = lambda : builtins.print("Hello world! -- from Python")
  #endif
  
  print()