-(-x) = x.
# A prefix of a numeric constant. When it is placed immediately before an unsigned number, the combination names a negative number, the additive inverse of the positive number that the numeral would otherwise name.

In many contexts, it does not matter whether the second or the third of these usages is intended: -5 is the same number. When it is important to distinguish them, a raised minus sign is sometimes used for negative constants, as in elementary education, the programming