2.21 Expression Type evaluation -2147483647 - 1 == 2147483648U unsigned 1 -2147483647 - 1 < 2147483647 signed 1 -2147483647 - 1u < 2147483647 unsigned 0 -2147483647 - 1 < -2147483647 signed 1 -2147483647 - 1u < -2147483647 unsigned 1