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Diffstat (limited to 'Doc/Zsh/arith.yo')
| -rw-r--r-- | Doc/Zsh/arith.yo | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/Doc/Zsh/arith.yo b/Doc/Zsh/arith.yo index e47c0284a..095756667 100644 --- a/Doc/Zsh/arith.yo +++ b/Doc/Zsh/arith.yo @@ -43,6 +43,28 @@ The var(base)tt(#) may also be omitted, in which case base 10 is used. For backwards compatibility the form `tt([)var(base)tt(])var(n)' is also accepted. +It is also possible to specify a base to be used for output in the form +`tt([#)var(base)tt(])', for example `tt([#16])'. This is used when +outputting arithmetical substitutions or when assigning to scalar +parameters, but an explicitly defined integer or floating point parameter +will not be affected. If an integer variable is implicitly defined by an +arithmetic expression, any base specified in this way will be set as the +variable's output arithmetic base as if the option `tt(-i) var(base)' to +the tt(typeset) builtin had been used. The expression has no precedence +and if it occurs more than once in a mathematical expression, the last +encountered is used. For clarity it is recommended that it appear at the +beginning of an expression. As an example: + +example(typeset -i 16 y +print $(( [#8] x = 32, y = 32 )) +print $x $y) + +outputs first `tt(8#40)', the rightmost value in the given output base, and +then `tt(8#40 16#20)', because tt(y) has been explicitly declared to +have output base 16, while tt(x) (assuming it does not already exist) is +implicitly typed by the arithmetic evaluation, where it acquires the output +base 8. + Floating point constants are recognized by the presence of a decimal point or an exponent. The decimal point may be the first character of the constant, but the exponent character tt(e) or tt(E) may not, as it will be |