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| author | dkf <donal.k.fellows@manchester.ac.uk> | 2012-05-16 23:16:14 (GMT) |
|---|---|---|
| committer | dkf <donal.k.fellows@manchester.ac.uk> | 2012-05-16 23:16:14 (GMT) |
| commit | e7e54ea02c546c0b5609becb675b3efc6141dab9 (patch) | |
| tree | 2f319240c63b52f71ee8329acb2dac92452ed23b /doc/expr.n | |
| parent | dab1c4651b59815513d0752c623c864da65a5376 (diff) | |
| download | tcl-e7e54ea02c546c0b5609becb675b3efc6141dab9.zip tcl-e7e54ea02c546c0b5609becb675b3efc6141dab9.tar.gz tcl-e7e54ea02c546c0b5609becb675b3efc6141dab9.tar.bz2 | |
[Bug 3525462]: Document what relational operators really do with string args.
Diffstat (limited to 'doc/expr.n')
| -rw-r--r-- | doc/expr.n | 6 |
1 files changed, 3 insertions, 3 deletions
@@ -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 |