NSNumberFormatterPercentStyle flakiness
NSNumberFormatterPercentStyle flakiness
- Subject: NSNumberFormatterPercentStyle flakiness
- From: Aron Nopanen <email@hidden>
- Date: Mon, 16 Jun 2008 00:22:04 +1200
Hi,
I've noticed some odd behavior with NSNumberFormatterPercentStyle in
NSNumberFormatter (on Leopard 10.5.3). Attempting to translate an
invalid string to a number causes subsequent number-to-string
conversions to give invalid results. 'Invalid results' can be more
accurately defined as 'correct value * 100'.
The following brief example illustrates. First, I create a number
formatter with 'percent' style. It translates '0.01' to string "1%".
I then try to translate an invalid string ("blah"; anything will do)
to a number. Finally, I again translate '0.01' to a string, and get
"100%" instead.
I've tried setting the multiplier to '1', which gives the same results
with the decimal point shifted two places to the left. I verified in
the debugger that the formatter attributes don't change during program
execution.
Localization is English, New Zealand. English, United States gives
the same results.
Source and output follow. Any ideas?
Regards,
Aron
#import <Foundation/Foundation.h>
int main (int argc, const char * argv[]) {
NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
NSNumberFormatter *nf;
nf = [[NSNumberFormatter alloc] init];
[nf setNumberStyle:NSNumberFormatterPercentStyle];
// Get string value for 0.01; results in 1%
NSNumber *num = [NSNumber numberWithFloat:0.01];
NSLog(@"\"%@\" gives \"%@\"", num, [nf stringFromNumber:num]);
// Attempt to translate any invalid string
NSString *str = @"blah", *err;
id obj = nil;
[nf getObjectValue:&obj forString:str errorDescription:&err];
NSLog(@"String \"%@\" gives \"%@\" error \"%@\"", str, obj, err);
// Get string value for 0.01, again; results in 100%
NSLog(@"\"%@\" gives \"%@\"", num, [nf stringFromNumber:num]);
[nf release];
[pool drain];
return 0;
}
Output:
2008-06-16 00:13:20.094 NumberFormatterPlay[13343:10b] "0.01" gives "1%"
2008-06-16 00:13:20.108 NumberFormatterPlay[13343:10b] String "blah"
gives "(null)" error "Formatting error."
2008-06-16 00:13:20.108 NumberFormatterPlay[13343:10b] "0.01" gives
"100%"
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