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| author | Peter Stephenson <p.w.stephenson@ntlworld.com> | 2015-01-09 22:46:42 +0000 |
|---|---|---|
| committer | Peter Stephenson <p.w.stephenson@ntlworld.com> | 2015-01-10 19:49:16 +0000 |
| commit | 53e3d9e0638d025cd99a65011ff96d5e2680e2ec (patch) | |
| tree | f29d9c668f581a85d2ce5d3a6a6879b793412745 /Doc | |
| parent | 3495dc5c275c7e3fe3517cfd20e2dc7f1cfa43db (diff) | |
| download | zsh-53e3d9e0638d025cd99a65011ff96d5e2680e2ec.tar.gz zsh-53e3d9e0638d025cd99a65011ff96d5e2680e2ec.tar.xz zsh-53e3d9e0638d025cd99a65011ff96d5e2680e2ec.zip | |
34914: explanation of effect of integer promotion
Diffstat (limited to 'Doc')
| -rw-r--r-- | Doc/Zsh/arith.yo | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/Doc/Zsh/arith.yo b/Doc/Zsh/arith.yo index a620b73d1..5c334ce9c 100644 --- a/Doc/Zsh/arith.yo +++ b/Doc/Zsh/arith.yo @@ -233,6 +233,15 @@ necessary. In addition, if any operator which requires an integer equivalents with assignment) is given a floating point argument, it will be silently rounded down to the next integer. +Users should beware that, in common with many other programming +languages but not software designed for calculation, the evaluation of +an expression in zsh is taken a term at a time and promotion of integers +to floating point does not occur in terms only containing integers. A +typical result of this is that a division such as tt(6/8) is truncated, +in this being rounded down to 0. The tt(FORCE_FLOAT) shell option can +be used in scripts or functions where floating point evaluation is +required throughout. + Scalar variables can hold integer or floating point values at different times; there is no memory of the numeric type in this case. |