Question #28691

what does "if (( a & b ) == b)" mean?
for Example:
if ((e.Modifiers & Keys.Shift) == Keys.Shift)
{
lbl.Text += "\n" + "Shift was held down.";
}

Expert's answer

& -the bitwise-AND operator, which compares each bitof its first operand to the corresponding bit of its second operand. If both

bits are 1, the corresponding result bit is set to 1. Otherwise, the

corresponding result bit is set to 0.

In this case, condition "if (( a & b ) ==b)" is TRUE, when a>=b. This construction may be used with 2-byte

variables, when most significant bit is a key, least - modifiers.

bits are 1, the corresponding result bit is set to 1. Otherwise, the

corresponding result bit is set to 0.

In this case, condition "if (( a & b ) ==b)" is TRUE, when a>=b. This construction may be used with 2-byte

variables, when most significant bit is a key, least - modifiers.

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