The signed right shift >> available on earlier versions of .NET preserves the sign bit when shifting right meaning that negative numbers remain negative.

The new unsigned right shift >>> shifts the bits to the right and fills the left bits with zeroes in the same way that << shifts bits to the left and fills the right bits with zeroes.

Code

Now

int val = -64;                   // 0b11111111_11111111_11111111_11000000 (-64)

// Binary right shift by 3 bits

int b = val >>> 3;               // 0b00011111_11111111_11111111_11111000 (536870904)

Before

int val = -64;                   // 0b11111111_11111111_11111111_11000000 (-64)

// Cast to uint so >> fills with zeroes, then cast back
int b = (int)((uint)val >> 3);   // 0b00011111_11111111_11111111_11111000 (536870904)

Notes

• Positive values shifted with >>> have the same result as if shifted by >>
• Also in C# 11, the right hand operand of a user-defined shift operator no longer needs to be an int; the built-in shift operators still require one

More information

• Language reference
• Proposal