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Diffstat (limited to 'Doc/ref/ref5.tex')
| -rw-r--r-- | Doc/ref/ref5.tex | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/Doc/ref/ref5.tex b/Doc/ref/ref5.tex index 34dfeb1..7857e95 100644 --- a/Doc/ref/ref5.tex +++ b/Doc/ref/ref5.tex @@ -523,12 +523,14 @@ evaluated only once (but in both cases $z$ is not evaluated at all when $x < y$ is found to be false). \indexii{chaining}{comparisons} +\catcode`\_=8 Formally, $e_0 op_1 e_1 op_2 e_2 ...e_{n-1} op_n e_n$ is equivalent to $e_0 op_1 e_1$ \verb\and\ $e_1 op_2 e_2$ \verb\and\ ... \verb\and\ $e_{n-1} op_n e_n$, except that each expression is evaluated at most once. Note that $e_0 op_1 e_1 op_2 e_2$ does not imply any kind of comparison between $e_0$ and $e_2$, e.g. $x < y > z$ is perfectly legal. +\catcode`\_=12 The forms \verb\<>\ and \verb\!=\ are equivalent; for consistency with C, \verb\!=\ is preferred; where \verb\!=\ is mentioned below |