A number is used to represent a signed or unsigned fractional or whole value. A ~plus sign (+) or a minus sign (–) immediately followed by an unsigned number with no intervening space is always taken as a sign, and not as an operator.

An unsigned number represents an unsigned fractional or whole value.

Numbers and unsigned numbers are specified in the following manner:

<number>

──┬───────┬─<unsigned number>──────────────────────────────────────────┤
  ├─  +  ─┤
  └─  -  ─┘

<unsigned number>

──┬─<unsigned integer>─┬────────────────────────────┬──────────────────┤
  │                    └─  .  ─┬────────────────────┤
  │                            └─<unsigned integer>─┤
  └─  . <unsigned integer> ─────────────────────────┘

Examples

The following examples illustrate signed and unsigned numbers:

1
+5
-321
+123.456
-0.98