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| -rw-r--r-- | ChangeLog | 6 | ||||
| -rw-r--r-- | doc/expr.n | 6 |
2 files changed, 9 insertions, 3 deletions
@@ -1,3 +1,9 @@ +2012-05-17 Donal K. Fellows <dkf@users.sf.net> + + * doc/expr.n: [Bug 3525462]: Corrected statement about what happens + when comparing "0y" and "0x12"; the previously documented behavior was + actually a subtle bug (now long-corrected). + 2012-05-13 Jan Nijtmans <nijtmans@users.sf.net> * win/tclWinDde.c: Protect against receiving strings without ending \0, @@ -298,6 +298,7 @@ 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, except in the case of the \fBeq\fR and \fBne\fR operators. If one of the operands of a comparison is a string and the other has a numeric value, a canonical string representation of the numeric @@ -308,11 +309,10 @@ is that produced by the \fB%g\fR format specifier of Tcl's \fBformat\fR command. 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 is not generally a good idea to use operators like \fB==\fR when you really want string comparison and the values of the |