Convertion of grey code and binary 格雷码和二进制数之间的转换

/*
The purpose of this function is to convert an unsigned
binary number to reflected binary Gray code.

The operator >> is shift right. The operator ^ is exclusive or.
*/
unsigned int binaryToGray(unsigned int num)
{
return (num >> 1) ^ num;
}

/*
The purpose of this function is to convert a reflected binary
Gray code number to a binary number.
*/
unsigned int grayToBinary(unsigned int num)
{
unsigned int mask;
for (mask = num >> 1; mask != 0; mask = mask >> 1)
{
num = num ^ mask;
}
return num;
}