整形转格雷码
x= (x>>1)^x
格雷码转整形（3种方法）
static unsigned int GraytoDecimal(unsigned int x)
{
unsigned int y = x;
while(x>>=1)
y ^= x;
return y;
}
static unsigned int GraytoDecimal(unsigned int x)
{
x^=x>>16;
x^=x>>8;
x^=x>>4;
x^=X>>2;
x^=x^1;
return x;
}
static unsigned int GraytoDecimal(unsigned int x)
{
int i;
for(i=0;(1<<i)<sizeof(x)*8;i++)
{
x^=x>>(1<<i);
}
return x;
}
staticunsignedint GraytoDecimal(unsignedint x) { unsignedint y = x; while(x>>=1) y ^= x; return y; } staticunsignedint GraytoDecimal(unsignedint x) { x^=x>>16; x^=x>>8; x^=x>>4; x^=X>>2; x^=x^1; return x; } staticunsignedint GraytoDecimal(unsignedint x) { int i; for(i=0;(1<<i)<sizeof(x)*8;i++) { x^=x>>(1<<i); } return x; }