C# Language: Changing the First Four Bits in a Byte

Question

In order to utilize a byte to its fullest potential, I\'m attempting to store two unique values into a byte: one in the first four bits and another in the second four bits. How

Answer 1

public int SplatBit(int Reg, int Val, int ValLen, int Pos)
{
    int mask = ((1 << ValLen) - 1) << Pos;
    int newv = Val << Pos;
    int res = (Reg & ~mask) | newv;
    return res;            
}

Example:

• Reg = 135
• Val = 9 (ValLen = 4, because 9 = 1001)

• Pos = 2

• 135 = 10000111

• 9 = 1001
• 9 << Pos = 100100
• Result = 10100111