关于数字表示

volatile number_type x;
x = 512.123;

typedef unsigned char const volatile uccv;
uccv *c = reinterpret_cast< uccv * >( & x );
std::cout << std::hex;
std::cout.fill( \'0\' );
for ( uccv *pen = c; pen != c + sizeof x; ++ pen ) {
    std::cout.width( 2 );
    std::cout << static_cast< unsigned >( * pen );
}
std::cout << std::dec << \'\\n\';

(favoriteType)-1 & (favoriteType)3 

T value = ...; // for some numeric type T (int, short, long, double, float, etc.)
unsigned char *p = (unsigned char*) &value;
size_t i;

printf(\"%10s%8s\\n\", \"address\", \"value\");
printf(\"%10s%8s\\n\", \"-------\", \"-----\");
for (i = 0; i < sizeof value; i++)
  printf(\"%10p%8x\\n\", p+i, (unsigned int) p[i]);

unsigned int value = 0x01;
unsigned char *p = (unsigned char *) &value;
if (p[0] == 1)
  printf(\"Little-endian\\n\");
else if (p[sizeof value - 1] == 1)
  printf(\"Big-endian\\n\");
else
  printf(\"Weird\\n\");