Why is a cast required for byte subtraction in C#? [duplicate]

Answer 1

Arithmetic on bytes results in an int value by default.

Answer 2

Because arithmetic operations on sbyte, byte, ushort, and short are automatically converted to int. The most plausible reason for this is that such operations are likely to overflow or underflow.

Thus, in your ternary operation, the final oColor.R - percent, actually results in an int, not a byte. So the return type of the operation is int.

Answer 3

Because the arithmetic expression on the right-hand side of the assignment operator evaluates to int by default. In your example percent defaults to int. You can read more about it on the MSDN page.

Answer 4

Because subtraction is coercing up to an integer. As I recall, byte is an unsigned type in C#, so subtraction can take you out of the domain of bytes.

Answer 5

This is because byte subtraction returns an int. Actually any binary arithmetic operations on bytes will return an int, so the cast is required.

Answer 6

That's because the result of a byte subtraction doesn't fit in a byte:

byte - byte = (0..255) - (0..255) = -255..255