Format array of floating points [blended C/C++]

#ifdef __cplusplus
#include <iostream>
#include <iomanip>
#include <array>
#else
#include <stdio.h>
#endif

int main() {
#ifdef __cplusplus
    auto a = std::array {
        10.67, 68.43, 56.55, 92.60, 90.65,
    };
#else
    double a[] = {
        10.67, 68.43, 56.55, 92.60, 90.65,
    };
    size_t const a_sz = sizeof(a) / sizeof(*a);
#endif

#ifdef __cplusplus
    std::cout << "array elements are:\n";
    std::cout << std::fixed
              << std::setprecision(2);
    for (auto d : a) {
        std::cout << std::setw(8) << d;
    }
    std::cout << std::endl;
#else
    printf("array elements are:\n");

    for (size_t i = 0; i < a_sz; i++) {
        printf("%8.2f", a[i]);
    }
    putchar('\n');
#endif

    return 0;
}