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34290: note FORCE_FLOAT option change

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Peter Stephenson 2015-01-15 15:07:26 +00:00
parent 3a99ef322d
commit 2b8b1a49d5
2 changed files with 47 additions and 4 deletions
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2
ChangeLog
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@ -1,5 +1,7 @@
2015-01-15 Peter Stephenson <p.stephenson@samsung.com> 2015-01-15 Peter Stephenson <p.stephenson@samsung.com>
* 34290 (correcting typo): README: note FORCE_FLOAT behaviour change.
* 34280: Doc/Zsh/options.yo, Src/math.c, Test/C01arith.ztst: * 34280: Doc/Zsh/options.yo, Src/math.c, Test/C01arith.ztst:
make FORCE_FLOAT option also cover variables when read for make FORCE_FLOAT option also cover variables when read for
use in arithmetic expressions. use in arithmetic expressions.

49
README
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@ -38,10 +38,12 @@ details, see the documentation.
Incompatibilites between 5.0.7 and 5.0.8 Incompatibilites between 5.0.7 and 5.0.8
---------------------------------------- ----------------------------------------
A couple of arithmetic operations have changed: the new behaviour Various arithmetic operations have changed, in particular with respect
is intended to be more consistent, but is not compatible with the old. to the choice of integer or floating point operations. The new
behaviour is intended to be more consistent, but is not compatible with
the old.
Previously, the modulus operation, `%', implicitly converted the 1) Previously, the modulus operation, `%', implicitly converted the
operation to integer and output an integer result, even if one operation to integer and output an integer result, even if one
or both of the arguments were floating point. Now, the C math or both of the arguments were floating point. Now, the C math
library fmod() operator is used to implement the operation where library fmod() operator is used to implement the operation where
@ -57,7 +59,8 @@ New behaviour:
% print $(( 5.5 % 2 )) % print $(( 5.5 % 2 ))
1.5 1.5
Previously, assignments to variables assigned the correct type to
2) Previously, assignments to variables assigned the correct type to
variables declared as floating point or integer, but this type was variables declared as floating point or integer, but this type was
not propagated to the value of the expression, as a C programmer not propagated to the value of the expression, as a C programmer
would naturally expect. Now, the type of the variable is propagated would naturally expect. Now, the type of the variable is propagated
@ -81,6 +84,44 @@ New behaviour:
% print $var % print $var
2 2
3) Previously, the FORCE_FLOAT option only forced the use of floating
point in arithmetic expressions for integer constants, i.e. numbers
typed directly into the expression, but not for variables. Hence
an operation involving only integer variables (or string variables
containing integers) was not forced to be performed with floating point
arithmetic. Now, operations involving variables are also forced to
floating point. For example:
Old behaviour:
% unsetopt FORCE_FLOAT
% print $(( 1 / 2 ))
0
% integer i=1 j=2
% print $(( i / j ))
0
% setopt FORCE_FLOAT
% print $(( 1 / 2 ))
0.5
% print $(( i / j ))
0
New behaviour:
% unsetopt FORCE_FLOAT
% print $(( 1 / 2 ))
0
% integer i=1 j=2
% print $(( i / j ))
0
% setopt FORCE_FLOAT
% print $(( 1 / 2 ))
0.5
% print $(( i / j ))
0.5
Incompatibilities between 5.0.2 and 5.0.5 Incompatibilities between 5.0.2 and 5.0.5
----------------------------------------- -----------------------------------------