I need to assign 2,554,416,000 to a variable. What would be the primitive to use, and what would be the object representation class to use? Thanks.
+1
A:
2,554,416,000 = 0x9841,4B80 ≤ 0xFFFF,FFFF (UINT_MAX), so uint32_t (unsigned int) or int64_t (long long).
A signed int32_t (int) cannot represent this because 0x9841,4B80 > 0x7FFF,FFFF (INT_MAX). Storing it in an int will make it negative.
KennyTM
2010-05-27 21:04:16
+1
A:
This can be represented by a 32-bit unsigned integer (UINT_MAX is about 4 billion). That's actually what NSUInteger is on the iPhone, but if you want to be very specific about the bit width, you could specify a uint32_t.
Chuck
2010-05-27 21:04:24
@Squeegy, your code is using a signed integer, not an unsigned integer. Try an unsigned integer.
Alex Reynolds
2010-05-27 21:10:36
Yeah, I figured that out and deleted the comment, hoping you wouldn't see it and I wouldn't look like an idiot.
Squeegy
2010-05-27 21:13:27
@Squeegy, mission accomplished! Thanks guys.
marty
2010-05-27 21:21:06
+1
A:
Chuck is right, but in answer to the "object representation", you want NSNumber used with the unsignedInt methods.
NSNumber *myNum = [NSNumber numberWithUnsignedInt:2554416000];
NSUInteger myInt = [myNum unsignedIntValue];
Squeegy
2010-05-27 21:12:08
A:
You could store it in a regular int scaled down by 1000 if you wanted, if this represented a score that could never have the bottom 3 digits hold any info or something similiar. This would be a way to save a few bits and possibly an entire extra int of space, if that matters.
Michael Dorgan
2010-05-27 21:18:05