#include <stdio.h>
#include <string.h>

int main()
{
    int array[3] = { 0 };
    memcpy(array, (int []){ 0x01, 0x02, 0x03 }, sizeof array);
    for (size_t i = 0; i < sizeof(array) / sizeof(array[0]); i++) {
        printf("%02x ", array[i]);
    }
    
    printf("\n");
    return 0;
}