>x = 12345
>x = 0 - x && Invert the sign x = -12345
>x = 0 - x && Invert the sign x = +12345
>
While this should give you the correct solution, the zero is not really required: x = -x is enough.
Difference in opinions hath cost many millions of lives: for instance, whether flesh be bread, or bread be flesh; whether whistling be a vice or a virtue; whether it be better to kiss a post, or throw it into the fire... (from Gulliver's Travels)
