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authordkf <donal.k.fellows@manchester.ac.uk>2012-05-16 23:16:14 (GMT)
committerdkf <donal.k.fellows@manchester.ac.uk>2012-05-16 23:16:14 (GMT)
commit03716dfee8f0f0df26a8c56e6a2b3ceeb9319dbc (patch)
tree2f319240c63b52f71ee8329acb2dac92452ed23b /doc/expr.n
parent7ac6053161fe49bc32f962b38e67f94f172ce709 (diff)
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[Bug 3525462]: Document what relational operators really do with string args.
Diffstat (limited to 'doc/expr.n')
-rw-r--r--doc/expr.n6
1 files changed, 3 insertions, 3 deletions
diff --git a/doc/expr.n b/doc/expr.n
index e529925..4c8903a 100644
--- a/doc/expr.n
+++ b/doc/expr.n
@@ -364,6 +364,7 @@ returns \fB4.0\fR, not \fB4\fR.
String values may be used as operands of the comparison operators,
although the expression evaluator tries to do comparisons as integer
or floating-point when it can,
+i.e., when all arguments to the operator allow numeric interpretations,
.VS 8.4
except in the case of the \fBeq\fR and \fBne\fR operators.
.VE 8.4
@@ -374,11 +375,10 @@ a string using the C \fIsprintf\fR format specifier
For example, the commands
.CS
\fBexpr {"0x03" > "2"}\fR
-\fBexpr {"0y" < "0x12"}\fR
+\fBexpr {"0y" > "0x12"}\fR
.CE
both return 1. The first comparison is done using integer
-comparison, and the second is done using string comparison after
-the second operand is converted to the string \fB18\fR.
+comparison, and the second is done using string comparison.
Because of Tcl's tendency to treat values as numbers whenever
possible, it isn't generally a good idea to use operators like \fB==\fR
when you really want string comparison and the values of the