# Unary plus and minus

The unary minus operator changes the sign of a number. For example `-1` is minus one, and `-0e0` is the double value negative zero.

Unary plus has very little effect: the value of `+1` is the same as the value of `1`. It does, however, provide a quick way of forcing untyped values to be numeric, for example you can write `<xsl:sort select="+@price"/>` to force a numeric sort, if you find `<xsl:sort select="number(@price)"/>` too verbose for your tastes.

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