Node: Examples of Potential Numbers, Previous: Escape Characters and Potential Numbers, Up: Numbers as Tokens
As examples, the tokens in Figure 2-10 are potential numbers, but they are not actually numbers, and so are reserved tokens; a conforming implementation is permitted, but not required, to define their meaning.
1b5000 777777q 1.7J -3/4+6.7J 12/25/83 27^19 3^4/5 6//7 3.1.2.6 ^-43^ 3.141_592_653_589_793_238_4 -3.7+2.6i-6.17j+19.6k Figure 2--10: Examples of reserved tokens
The tokens in Figure 2-11 are not potential numbers; they are always treated as symbols:
/ /5 + 1+ 1- foo+ ab.cd _ ^ ^/- Figure 2--11: Examples of symbols
The tokens in Figure 2-12 are potential numbers if the current input base is 16, but they are always treated as symbols if the current input base is 10.
bad-face 25-dec-83 a/b fad_cafe f^ Figure 2--12: Examples of symbols or potential numbers