In C++, am I paying for what I am not eating?

Question

Let\'s consider the following hello world examples in C and C++:

main.c

#include 

int main()
{
    printf(\"Hello world\\n\");
    r         


        

Answer 1

You are not comparing C and C++. You are comparing printf and std::cout, which are capable of different things (locales, stateful formatting, etc).

Try to use the following code for comparison. Godbolt generates the same assembly for both files (tested with gcc 8.2, -O3).

main.c:

#include 

int main()
{
    int arr[6] = {1, 2, 3, 4, 5, 6};
    for (int i = 0; i < 6; ++i)
    {
        printf("%d\n", arr[i]);
    }
    return 0;
}

main.cpp:

#include 
#include 

int main()
{
    std::array arr {1, 2, 3, 4, 5, 6};
    for (auto x : arr)
    {
        std::printf("%d\n", x);
    }
}