Add comments to a Python script and make it a bilingual Python/C++ “program”

Question

Given the following Python 3 script:

def greet():
    print("Hello, world!")

greet()

Prepend some lines to this text file so that it can be both executed as a Python program as well as compiled and run as a C++ program producing the same output Hello, world! (including the newline at the end):

$ python3 bilingual.py.cpp
Hello, world!
$ g++ bilingual.py.cpp && ./a.out
Hello, world!

The solution will be scored by the count of non-whitespace characters of the entire program, including the Python script:

sed 's/\s//g' bilingual.py.cpp|wc -c

Answer 1

Score 116

Prepend:

#include<cstdio>
#define print(A)main(){puts(A);}
#define greet()
#define \

The preprocessor backslash \ pulls the nasty : containing line into an unused macro. Try it here.

Thanks to edc65's answer for the note about implicit int in C++4.
Thanks to PieCot's answer for suggesting <cstdio> over <stdio.h>.
Thanks to Leon for suggest I remove the X in the original #define X\.

Answer 2

Score 119

(Thx @Linus for the byte count)

(1 byte saved thx @Conor O'Brien) (1 byte saved thx @PieCot)

Counting bytes again by hand, I found 113. Maybe it's right this time. No it's not

#include <cstdio>
#define def main(){0?
#define print(x) puts(x);}
#define greet()

Notes: stdio and puts are still alive and kicking in C++. The missing int type is valid in C++ 4. Test

Answer 3

Score 131 130 134

The lines to be prepended are:

#import <iostream>
#define def int main(){0?
#define greet()
#define print(A) 0;std::cout<<A"\n";}

And the resulting code:

#import <iostream>
#define def int main(){0?
#define greet()
#define print(A) 0;std::cout<<A"\n";}
def greet():
    print("Hello, world!")

greet()

Testing

C:\Users\Conor O'Brien\Documents\Programming\golf
λ type bilingual.py.cpp

#import <iostream>
#define def int main(){0?
#define greet()
#define print(A) 0;std::cout<<A"\n";}
def greet():
    print("Hello, world!")

greet()
C:\Users\Conor O'Brien\Documents\Programming\golf
λ sed 's/\s//g' bilingual.py.cpp|wc -c
134

C:\Users\Conor O'Brien\Documents\Programming\golf
λ g++ bilingual.py.cpp 2>nul && a
Hello, world!

C:\Users\Conor O'Brien\Documents\Programming\golf
λ python bilingual.py.cpp
Hello, world!

C:\Users\Conor O'Brien\Documents\Programming\golf
λ 

Answer 4

Score 136

Only for the records:

#include <cstdio>
#define def class a{public
#define greet()
#define print(a) };int main(){puts(a);}

Another (less efficient) way to handle the colon.

Answer 5

Score 110 104

Improving upon Linus' answer:

#include <cstdio>
#define print main(){puts
#define greet() ;}//\
def greet():
    print("Hello, world!")

greet()

Test as C++

Test as Python