C vs C++

wat.c??

#include <stdio.h>

char X = 'a';

int main(int argc, char* argv[])
{
    (void) argc;
    (void) argv;

    struct X {
        char a[2];
    };

    if (sizeof(X) == 1) {
        printf("I am a C program!\n");
    } else {
        printf("I am a C++ program!\n");
    }
    
    return 0;
}

A file that is both correct C11 and correct C++11, but does something different in each language. Compiles warning free with both gcc -std=c11 -Wall -Wextra -pedantic and g++ -std=c++11 -Wall -Wextra -pedantic (well, modulo extension rename, if you use .c to compile with g++ you'll get a warning about that.