When a token is read, it is interpreted as a number or symbol. The token is interpreted as a number if it satisfies the syntax for numbers specified in Figure 2–9.
| numeric-token | ::= | !integer | !ratio | !float |
| integer | ::= | [sign] {decimal-digit}^+ decimal-point | [sign] {digit}^+
|
| ratio | ::= | [sign] {digit}^+ slash {digit}^+
|
| float | ::= | [sign] {decimal-digit}* decimal-point {decimal-digit}^+ [!exponent]
| [sign] {decimal-digit}^+ [decimal-point {decimal-digit}*] !exponent
|
| exponent | ::= | exponent-marker [sign] {digit}^+
sign—a sign.
slash—a slash
decimal-point—a dot.
exponent-marker—an exponent marker.
decimal-digit—a digit in radix 10.
digit—a digit in the current input radix.
|
| Potential Numbers as Tokens | ||
| Escape Characters and Potential Numbers | ||
| Examples of Potential Numbers |