#include <stdio.h>
#include <stdint.h>
int main()
{
 union {
    double a;
    uint8_t ui8[8];
 } myu;

 int i;
 uint8_t temp;
   
 myu.a = 0.006323;
 printf("sizeof(double)   = %d\n",sizeof(double));
 printf("sizeof(uint8_t)  = %d\n",sizeof(uint8_t));
 printf("   sizeof(myu)   = %d\n",sizeof(myu));
 printf("         myu.a   = %f\n",myu.a); 
 for (i=0;i<8;++i) {
   printf("   myu.ui8[%01d]    = 0x%02X\n",i,myu.ui8[i]);
 }

 printf("Reverse endian...\n");
 for (i=0;i<4;++i) {
   temp = myu.ui8[i];
   myu.ui8[i] = myu.ui8[8-(i+1)];
   myu.ui8[8-(i+1)] = temp;
 }
 for (i=0;i<8;++i) {
   printf("   myu.ui8[%01d]    = 0x%02X\n",i,myu.ui8[i]);
 }
 printf("         myu.a   = %f\n",myu.a);
 return 0;
}