A little confused about NSDecimalNumber?
-1
there are a short code
NSString *numString = @"2128.123123";
NSDecimalNumber *large = [NSDecimalNumber decimalNumberWithString:numString];
NSDecimalNumberHandler *decimalHandler = [NSDecimalNumberHandler decimalNumberHandlerWithRoundingMode:NSRoundPlain scale:2 raiseOnExactness:NO raiseOnOverflow:NO raiseOnUnderflow:NO raiseOnDivideByZero:YES];
NSDecimalNumber *fin = [large decimalNumberByRoundingAccordingToBehavior:decimalHandler];
NSLog(@"%@",fin);
seem ok, print "2128.12".
.....
but you can try numString = @"78.991";
NSLog(@"%@",fin)
print "78.98999999999999"....
why scale is invalid? expect "78.99"
objective-c double nsdecimalnumber cgfloat
asked Nov 14 '18 at 11:55
Sunson_aloneSunson_alone
35
|
show 1 more comment
-1
there are a short code
NSString *numString = @"2128.123123";
NSDecimalNumber *large = [NSDecimalNumber decimalNumberWithString:numString];
NSDecimalNumberHandler *decimalHandler = [NSDecimalNumberHandler decimalNumberHandlerWithRoundingMode:NSRoundPlain scale:2 raiseOnExactness:NO raiseOnOverflow:NO raiseOnUnderflow:NO raiseOnDivideByZero:YES];
NSDecimalNumber *fin = [large decimalNumberByRoundingAccordingToBehavior:decimalHandler];
NSLog(@"%@",fin);
seem ok, print "2128.12".
.....
but you can try numString = @"78.991";
NSLog(@"%@",fin)
print "78.98999999999999"....
why scale is invalid? expect "78.99"
objective-c double nsdecimalnumber cgfloat
asked Nov 14 '18 at 11:55
Sunson_aloneSunson_alone
35
Possible duplicate of Is floating point math broken?
– luk2302
Nov 14 '18 at 11:56
Works for me. I think we need an MCVE: stackoverflow.com/help/mcve
– Ture Pålsson
Nov 14 '18 at 12:15
@luk2302 you're missing the point ofNSDecimalNumber. "An object for representing and performing arithmetic on base-10 numbers."
– Willeke
Nov 14 '18 at 13:02
@TurePålsson which version of macOS are you using?
– Willeke
Nov 14 '18 at 13:04
@Willeke I tested on Mojave, but I'm getting some linker warnings about stub files being out of sync (???) so it's possible that my system is somehow falling back to an older library...
– Ture Pålsson
Nov 14 '18 at 13:15
|
show 1 more comment
-1
-1
-1
there are a short code
NSString *numString = @"2128.123123";
NSDecimalNumber *large = [NSDecimalNumber decimalNumberWithString:numString];
NSDecimalNumberHandler *decimalHandler = [NSDecimalNumberHandler decimalNumberHandlerWithRoundingMode:NSRoundPlain scale:2 raiseOnExactness:NO raiseOnOverflow:NO raiseOnUnderflow:NO raiseOnDivideByZero:YES];
NSDecimalNumber *fin = [large decimalNumberByRoundingAccordingToBehavior:decimalHandler];
NSLog(@"%@",fin);
seem ok, print "2128.12".
.....
but you can try numString = @"78.991";
NSLog(@"%@",fin)
print "78.98999999999999"....
why scale is invalid? expect "78.99"
objective-c double nsdecimalnumber cgfloat
asked Nov 14 '18 at 11:55
Sunson_aloneSunson_alone
35
there are a short code
NSString *numString = @"2128.123123";
NSDecimalNumber *large = [NSDecimalNumber decimalNumberWithString:numString];
NSDecimalNumberHandler *decimalHandler = [NSDecimalNumberHandler decimalNumberHandlerWithRoundingMode:NSRoundPlain scale:2 raiseOnExactness:NO raiseOnOverflow:NO raiseOnUnderflow:NO raiseOnDivideByZero:YES];
NSDecimalNumber *fin = [large decimalNumberByRoundingAccordingToBehavior:decimalHandler];
NSLog(@"%@",fin);
seem ok, print "2128.12".
.....
but you can try numString = @"78.991";
NSLog(@"%@",fin)
print "78.98999999999999"....
why scale is invalid? expect "78.99"
objective-c double nsdecimalnumber cgfloat
objective-c double nsdecimalnumber cgfloat
asked Nov 14 '18 at 11:55
Sunson_aloneSunson_alone
35
asked Nov 14 '18 at 11:55
Sunson_aloneSunson_alone
35
edited Nov 15 '18 at 7:58
Sunson_alone
asked Nov 14 '18 at 11:55
Sunson_aloneSunson_alone
35
asked Nov 14 '18 at 11:55
Sunson_aloneSunson_alone
35
asked Nov 14 '18 at 11:55
Sunson_aloneSunson_alone
35
35
Possible duplicate of Is floating point math broken?
– luk2302
Nov 14 '18 at 11:56
Works for me. I think we need an MCVE: stackoverflow.com/help/mcve
– Ture Pålsson
Nov 14 '18 at 12:15
@luk2302 you're missing the point ofNSDecimalNumber. "An object for representing and performing arithmetic on base-10 numbers."
– Willeke
Nov 14 '18 at 13:02
@TurePålsson which version of macOS are you using?
– Willeke
Nov 14 '18 at 13:04
@Willeke I tested on Mojave, but I'm getting some linker warnings about stub files being out of sync (???) so it's possible that my system is somehow falling back to an older library...
– Ture Pålsson
Nov 14 '18 at 13:15
|
show 1 more comment
Possible duplicate of Is floating point math broken?
– luk2302
Nov 14 '18 at 11:56
Works for me. I think we need an MCVE: stackoverflow.com/help/mcve
– Ture Pålsson
Nov 14 '18 at 12:15
@luk2302 you're missing the point ofNSDecimalNumber. "An object for representing and performing arithmetic on base-10 numbers."
– Willeke
Nov 14 '18 at 13:02
@TurePålsson which version of macOS are you using?
– Willeke
Nov 14 '18 at 13:04
@Willeke I tested on Mojave, but I'm getting some linker warnings about stub files being out of sync (???) so it's possible that my system is somehow falling back to an older library...
– Ture Pålsson
Nov 14 '18 at 13:15
Possible duplicate of Is floating point math broken?
– luk2302
Nov 14 '18 at 11:56
Possible duplicate of Is floating point math broken?
– luk2302
Nov 14 '18 at 11:56
Works for me. I think we need an MCVE: stackoverflow.com/help/mcve
– Ture Pålsson
Nov 14 '18 at 12:15
Works for me. I think we need an MCVE: stackoverflow.com/help/mcve
– Ture Pålsson
Nov 14 '18 at 12:15
@luk2302 you're missing the point of
NSDecimalNumber. "An object for representing and performing arithmetic on base-10 numbers."– Willeke
Nov 14 '18 at 13:02
@luk2302 you're missing the point of
NSDecimalNumber. "An object for representing and performing arithmetic on base-10 numbers."– Willeke
Nov 14 '18 at 13:02
@TurePålsson which version of macOS are you using?
– Willeke
Nov 14 '18 at 13:04
@TurePålsson which version of macOS are you using?
– Willeke
Nov 14 '18 at 13:04
@Willeke I tested on Mojave, but I'm getting some linker warnings about stub files being out of sync (???) so it's possible that my system is somehow falling back to an older library...
– Ture Pålsson
Nov 14 '18 at 13:15
@Willeke I tested on Mojave, but I'm getting some linker warnings about stub files being out of sync (???) so it's possible that my system is somehow falling back to an older library...
– Ture Pålsson
Nov 14 '18 at 13:15
|
show 1 more comment
1 Answer
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oldest
votes
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fin is ok but NSLog calls doubleValue. In earlier versions of macOS, NSLog did call description which returns "78.99". Solution:
NSLog(@"%@", fin.description).
answered Nov 14 '18 at 13:02
WillekeWilleke
7,75121024
you mean, the fin value is "78.99"(although the initial value is "78.991")? NSLog makes it wrong?
– Sunson_alone
Nov 15 '18 at 5:29
and why "2128.123123" worked ok ,"78.991" not correct?╮(￣▽￣"")╭
– Sunson_alone
Nov 15 '18 at 5:39
NSLog(@"%@",fin)does the same asNSLog(@"%0.16g", fin.doubleValue). This is the broken floating point math problem. TryNSLog(@"%0.24g", fin.doubleValue).
– Willeke
Nov 15 '18 at 16:06
add a comment |
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1 Answer
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fin is ok but NSLog calls doubleValue. In earlier versions of macOS, NSLog did call description which returns "78.99". Solution:
NSLog(@"%@", fin.description).
answered Nov 14 '18 at 13:02
WillekeWilleke
7,75121024
you mean, the fin value is "78.99"(although the initial value is "78.991")? NSLog makes it wrong?
– Sunson_alone
Nov 15 '18 at 5:29
and why "2128.123123" worked ok ,"78.991" not correct?╮(￣▽￣"")╭
– Sunson_alone
Nov 15 '18 at 5:39
NSLog(@"%@",fin)does the same asNSLog(@"%0.16g", fin.doubleValue). This is the broken floating point math problem. TryNSLog(@"%0.24g", fin.doubleValue).
– Willeke
Nov 15 '18 at 16:06
add a comment |
2
fin is ok but NSLog calls doubleValue. In earlier versions of macOS, NSLog did call description which returns "78.99". Solution:
NSLog(@"%@", fin.description).
answered Nov 14 '18 at 13:02
WillekeWilleke
7,75121024
you mean, the fin value is "78.99"(although the initial value is "78.991")? NSLog makes it wrong?
– Sunson_alone
Nov 15 '18 at 5:29
and why "2128.123123" worked ok ,"78.991" not correct?╮(￣▽￣"")╭
– Sunson_alone
Nov 15 '18 at 5:39
NSLog(@"%@",fin)does the same asNSLog(@"%0.16g", fin.doubleValue). This is the broken floating point math problem. TryNSLog(@"%0.24g", fin.doubleValue).
– Willeke
Nov 15 '18 at 16:06
add a comment |
2
2
2
fin is ok but NSLog calls doubleValue. In earlier versions of macOS, NSLog did call description which returns "78.99". Solution:
NSLog(@"%@", fin.description).
answered Nov 14 '18 at 13:02
WillekeWilleke
7,75121024
fin is ok but NSLog calls doubleValue. In earlier versions of macOS, NSLog did call description which returns "78.99". Solution:
NSLog(@"%@", fin.description).
answered Nov 14 '18 at 13:02
WillekeWilleke
7,75121024
answered Nov 14 '18 at 13:02
WillekeWilleke
7,75121024
answered Nov 14 '18 at 13:02
WillekeWilleke
7,75121024
answered Nov 14 '18 at 13:02
WillekeWilleke
7,75121024
7,75121024
you mean, the fin value is "78.99"(although the initial value is "78.991")? NSLog makes it wrong?
– Sunson_alone
Nov 15 '18 at 5:29
and why "2128.123123" worked ok ,"78.991" not correct?╮(￣▽￣"")╭
– Sunson_alone
Nov 15 '18 at 5:39
NSLog(@"%@",fin)does the same asNSLog(@"%0.16g", fin.doubleValue). This is the broken floating point math problem. TryNSLog(@"%0.24g", fin.doubleValue).
– Willeke
Nov 15 '18 at 16:06
add a comment |
you mean, the fin value is "78.99"(although the initial value is "78.991")? NSLog makes it wrong?
– Sunson_alone
Nov 15 '18 at 5:29
and why "2128.123123" worked ok ,"78.991" not correct?╮(￣▽￣"")╭
– Sunson_alone
Nov 15 '18 at 5:39
NSLog(@"%@",fin)does the same asNSLog(@"%0.16g", fin.doubleValue). This is the broken floating point math problem. TryNSLog(@"%0.24g", fin.doubleValue).
– Willeke
Nov 15 '18 at 16:06
you mean, the fin value is "78.99"(although the initial value is "78.991")? NSLog makes it wrong?
– Sunson_alone
Nov 15 '18 at 5:29
you mean, the fin value is "78.99"(although the initial value is "78.991")? NSLog makes it wrong?
– Sunson_alone
Nov 15 '18 at 5:29
and why "2128.123123" worked ok ,"78.991" not correct?╮(￣▽￣"")╭
– Sunson_alone
Nov 15 '18 at 5:39
and why "2128.123123" worked ok ,"78.991" not correct?╮(￣▽￣"")╭
– Sunson_alone
Nov 15 '18 at 5:39
NSLog(@"%@",fin) does the same as NSLog(@"%0.16g", fin.doubleValue). This is the broken floating point math problem. Try NSLog(@"%0.24g", fin.doubleValue).– Willeke
Nov 15 '18 at 16:06
NSLog(@"%@",fin) does the same as NSLog(@"%0.16g", fin.doubleValue). This is the broken floating point math problem. Try NSLog(@"%0.24g", fin.doubleValue).– Willeke
Nov 15 '18 at 16:06
add a comment |
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Possible duplicate of Is floating point math broken?
– luk2302
Nov 14 '18 at 11:56
Works for me. I think we need an MCVE: stackoverflow.com/help/mcve
– Ture Pålsson
Nov 14 '18 at 12:15
@luk2302 you're missing the point of
NSDecimalNumber. "An object for representing and performing arithmetic on base-10 numbers."– Willeke
Nov 14 '18 at 13:02
@TurePålsson which version of macOS are you using?
– Willeke
Nov 14 '18 at 13:04
@Willeke I tested on Mojave, but I'm getting some linker warnings about stub files being out of sync (???) so it's possible that my system is somehow falling back to an older library...
– Ture Pålsson
Nov 14 '18 at 13:15