详解 IOS下int long longlong的取值范围

时间:2022-10-01 17:04:26

详解 IOSint long longlong的取值范围

32bit下:

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unsigned int 0~4294967295
int -2147483648~2147483647
unsigned long int一样
long int一样
long long的最大值:9223372036854775807
long long的最小值:-9223372036854775808
unsigned long long的最大值:1844674407370955161
__int64的最大值:9223372036854775807
__int64的最小值:-9223372036854775808
unsigned __int64的最大值:18446744073709551615

64bit下

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unsigned int 0~4294967295
int -2147483648~2147483647
unsigned long 和 unsigned long long一样
long long long一样
long long的最大值:9223372036854775807
long long的最小值:-9223372036854775808
unsigned long long的最大值:1844674407370955161
__int64的最大值:9223372036854775807
__int64的最小值:-9223372036854775808
unsigned __int64的最大值:18446744073709551615

NSObjCRuntime.h文件中:

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#ifndef _OBJC_NSOBJCRUNTIME_H_
#define _OBJC_NSOBJCRUNTIME_H_
#include <TargetConditionals.h>
#include <objc/objc.h>
#if __LP64__ || (TARGET_OS_EMBEDDED && !TARGET_OS_IPHONE) || TARGET_OS_WIN32 || NS_BUILD_32_LIKE_64
typedef long NSInteger;
typedef unsigned long NSUInteger;//64bit下NSInteger的取值范围就是long==long long
#else
typedef int NSInteger;
typedef unsigned int NSUInteger;//32bit下NSInteger的取值范围就是int==long
#endif
#define NSIntegerMax  LONG_MAX
#define NSIntegerMin  LONG_MIN
#define NSUIntegerMax  ULONG_MAX
#define NSINTEGER_DEFINED 1
#endif

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原文链接:http://blog.csdn.net/jingqiu880905/article/details/50477421