I read it's article and i try print Tagged Pointer for NSNumber
I try in xcode follow code:
- (NSString *)binForObjectPointer:(NSObject *)obj
{
return [self binForScalarNumber:(uintptr_t)(__bridge void *)(obj)];
}
- (NSString *)binForScalarNumber:(uintptr_t)number
{
NSString *ms = #"";
while (number)
{
if (number & 1)
ms = [ms stringByAppendingString:#"1"];
else
ms = [ms stringByAppendingString:#"0"];
number >>= 1;
}
return ms;
}
for (int i = 0; i < 10; ++i)
{
NSNumber *n = [NSNumber numberWithInt:i];
NSString *s = [self binForObjectPointer:n];
NSLog(#"%i %# %# %#",
i,
[s substringWithRange:NSMakeRange(0, s.length - 4)],
[s substringWithRange:NSMakeRange(s.length - 4, 3)],
[s substringWithRange:NSMakeRange(s.length - 1, 1)]
);
}
and get result in console
2014-09-25 16:57:46.926 AppName[3983:60b] 0 0000001111100101001010100 110 1
2014-09-25 16:57:46.930 AppName[3983:60b] 1 0000010000000101001010100 110 1
2014-09-25 16:57:46.931 AppName[3983:60b] 2 0000000001110101001010100 110 1
2014-09-25 16:57:46.932 AppName[3983:60b] 3 0000011011111101110001100 110 1
2014-09-25 16:57:46.933 AppName[3983:60b] 4 0000011011000110000110100 110 1
2014-09-25 16:57:46.934 AppName[3983:60b] 5 0000101101000110101001100 110 1
2014-09-25 16:57:46.935 AppName[3983:60b] 6 0000100110100110111010100 110 1
2014-09-25 16:57:46.936 AppName[3983:60b] 7 0000000111011010101001100 110 1
2014-09-25 16:57:46.938 AppName[3983:60b] 8 0000001100000110101010100 110 1
2014-09-25 16:57:46.939 AppName[3983:60b] 9 0000001011000110000110100 110 1
It doesn't look like in article example:
0000 0000 0000 0000 0000 0000 0011 1011
^ ^ ^ tag bit
| |
| tagged pointer class (5)
|
binary 3
When my error?
Related
Define a function to implement Fibonacci Sequence: 1, 1, 2, 3, 5, 8, 13, 21, 34. Please use the function output first 20 figures of Fibonacci Sequence.
Here is a python implementation
def fib(n):
a, b = 0, 1
while a < n:
print(a, end=' ')
a, b = b, a+b
print()
fib(5000)
Output
0 1 1 2 3 5 8 13 21 34 55 89 144 233 377 610 987 1597 2584 4181
A recursive implementation
memo = [-1] * 21
memo[0] = 0
memo[1] = 1
print(memo[0], end=' ')
print(memo[1], end=' ')
def fibrec(n):
if(memo[n] == -1):
memo[n] = fibrec(n-2) + fibrec(n-1)
print(memo[n], end=' ')
return memo[n]
fibrec(20)
Output
0 1 1 2 3 5 8 13 21 34 55 89 144 233 377 610 987 1597 2584 4181 6765
#include<stdio.h>
#include<conio.h>
#define FIRST_PART 7
#define LAST_PART 5
#define ALL_PARTS FIRST_PART+LAST_PART
int main()
{
printf ("The Square root of all parts is %d", ALL_PARTS * ALL_PARTS) ;
getch();
return(0);
}
In the above code the FIRST_PART is defined as 7
LAST_PART is defined as 5
and ALL_PARTS is initialized as FIRST_PART+LAST_PART (which is ideally 12)
but when i am printing ALL_PARTS * ALL_PARTS is giving me 47 as the output!(But i thought answer would be 144)
Please can anyone explain me how ?
The answer should be 47
FIRST_PART + LAST_PART * FIRST_PART + LAST_PART
MULTIPLICATION HAS MORE PRECEDENCE
SO 7 + 5 * 7 + 5
7 + 35 + 5
47
i am able to retrieve value from the peripheral as hex value and i need to convert as per my requirement.[24/12/14 11:37:00 am] sonali_phatak: I can see that i have received proper response.from 01117100352e36302e313100000000e55a
01 - 01-start byte
11 - 17(Dec) - length of responce packet
71 - response ID
00 - Ignore this byte
So now out of total length 17, first 4 bytes are header, last 2 bytes are CRC. We
need to read remaining 11 bytes and convert them to ASCII.
35 - 5
2e - .
36 - 6
30 - 0
2e - .
31 - 1
31 - 1
So Iam getting version number from watch as 5.60.11
But i need to show the above value 5.60.11 in string and print in console . how to convert it pleas help me
Please try this :
NSString *strOriginalHex= #"01117100352e36302e313100000000e55a";
NSString *strNewHexForVersion = [strOriginalHex substringWithRange:NSMakeRange(8, 14)];
NSLog(#"%#",[self stringFromHexString:strNewHexForVersion]);//5.60.11
- (NSString *)stringFromHexString:(NSString *)aStrHexString
{
// The hex codes should all be two characters.
if (([aStrHexString length] % 2) != 0)
return nil;
NSMutableString *aMutStrNewString = [NSMutableString string];
for (NSInteger i = 0; i < [aStrHexString length]; i += 2)
{
NSString *hex = [aStrHexString substringWithRange:NSMakeRange(i, 2)];
NSInteger decimalValue = 0;
sscanf([hex UTF8String], "%x", &decimalValue);
[aMutStrNewString appendFormat:#"%c", decimalValue];
}
return aMutStrNewString;
}
When I try to build my project i get the following error on line 827
/PATH_TO_PROJECT/Libs/CocoaLibSpotify/Model/SPPlaylist.m:827:25: Implicit conversion of Objective-C pointer type 'AVAssetTrack *' to C pointer type 'sp_track *' (aka 'struct sp_track *') requires a bridged cast
Here is the code where the error occurs:
805 -(void)addItems:(NSArray *)newItems atIndex:(NSUInteger)index callback:(SPErrorableOperationCallback)block {
806
807 SPDispatchAsync(^{
808
809 if (newItems.count == 0) {
810 dispatch_async(dispatch_get_main_queue(), ^{
811 if (block) block([NSError spotifyErrorWithCode:SP_ERROR_INVALID_INDATA]);
812 });
813 return;
814 }
815
816 sp_track **tracks = malloc(sizeof(sp_track *) * newItems.count);
817
818 // libSpotify iterates through the array and inserts each track at the given index,
819 // which ends up reversing the expected order. Defeat this by constructing a backwards
820 // array.
821 for (int currentTrack = (int)newItems.count - 1; currentTrack >= 0; currentTrack--) {
822
823 sp_track *track;
824 id item = [newItems objectAtIndex:currentTrack];
825
826 if ([item isKindOfClass:[SPTrack class]])
827 track = [item track];
828 else
829 track = [(SPTrack *)((SPPlaylistItem *)item).item track];
830
831 tracks[currentTrack] = track;
832 }
833 sp_track *const *trackPointer = tracks;
834
835 if (block)
836 [self.addCallbackStack addObject:block];
837
838 sp_error errorCode = sp_playlist_add_tracks(self.playlist, trackPointer, (int)newItems.count, (int)index, self.session.session);
839 free(tracks);
840 tracks = NULL;
841
842 NSError *error = nil;
843 if (errorCode != SP_ERROR_OK)
844 error = [NSError spotifyErrorWithCode:errorCode];
845
846 if (error && block) {
847 [self.addCallbackStack removeObject:block];
848 dispatch_async(dispatch_get_main_queue(), ^{ block(error); });
849 }
850 });
851 }
Thanks for your help!
The error is pretty self-explanatory - you need to make a bridged cast.
track = (__bridge sp_track *)[item track];
or
track = [(SPPlaylistItem *)item track];
Below is a simplified example of my problem. I am trying to store the same object with different values. But when I set a new value, all the values change.
StopsOnRoute.h
#interface StopsOnRoutes : NSObject
#property (nonatomic) NSUInteger start_route_id;
#property (nonatomic) NSUInteger start_stop_id;
#property (nonatomic) NSUInteger start_time;
#end
FirstViewController.m
- (void)viewDidLoad
{
NSMutableArray *route1 = [[NSMutableArray alloc] init];
StopsOnRoutes *stopOnRoutes = [[StopsOnRoutes alloc] init];
int p_time = 0;
int p_route = 0;
int p_stop = 0;
while(p_time<10){
p_time = p_time + 1;
p_route = p_route + 1;
p_stop = p_stop + 1;
[stopOnRoutes setStart_time:p_time];
[stopOnRoutes setStart_route_id:p_route];
[stopOnRoutes setStart_stop_id:p_stop];
[route1 addObject:stopOnRoutes];
}
}
Unexpected output of array route1:
10 | 10 | 10
10 | 10 | 10
10 | 10 | 10
10 | 10 | 10
10 | 10 | 10
10 | 10 | 10
10 | 10 | 10
10 | 10 | 10
10 | 10 | 10
10 | 10 | 10
Expected output of array route1:
1 | 1 | 1
2 | 2 | 2
3 | 3 | 3
4 | 4 | 4
5 | 5 | 5
6 | 6 | 6
7 | 7 | 7
8 | 8 | 8
9 | 9 | 9
10 | 10 | 10
You are reusing the same object instance over and over. Create a new one each time in the loop.
while(p_time<10){
StopsOnRoutes *stopOnRoutes = [[StopsOnRoutes alloc] init];
p_time = p_time + 1;
p_route = p_route + 1;
p_stop = p_stop + 1;
[stopOnRoutes setStart_time:p_time];
[stopOnRoutes setStart_route_id:p_route];
[stopOnRoutes setStart_stop_id:p_stop];
[route1 addObject:stopOnRoutes];
}