GCC vs Turbo C compiler

Question

When I compiled this program in two different compiler then I got two different result why it is so?

#include <iostream>
#include <stdio.h>
using namespace std;

int main() {
    int a = 3;
    printf("%d%d", a++,++a);
    return 0;
}
Producing different output:-

1. Turbo -> 44

2. GCC  -> 45

Comments

but both are not correct. It is a undefined behaviour as per C

Answer 1

in C and C++ order of execution of function parameters is left undefined

and printf is a function

therefore it is implementation dependent