_ Negative Sign / Infinity

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Negative Sign and Infinity | _ |

The symbol`_` followed by a digit denotes a negative number (as in`_3.4`),`` and denotes infinity when used alone, or negative infinity (in`__`).`` It is also used in names, as discussed in Part I and in Part II Section I.

For example:

       2 % 0                      Two divided by zero
    _

       10 ^. 0                    Base ten logarithm of zero
    __

       _2 _ 3 + 5
    3 _ 8

       integer_test=: =<.         Use of break in name
       integer_test 3 3.5
    1 0

Although`-2` may sometimes be used instead of`_2`,`` it is important to understand that the former is the application of a function to the number`2`,`` whereas the symbol`_` is an indivisible part of the number representation, just as the period is an indivisible part of a number such as`8.9` .

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