详解 IOS下int long longlong的取值范围
32bit下:unsigned int 0~4294967295
int -2147483648~
详解 IOS下int long longlong的取值范围
32bit下:
unsigned int 0~4294967295 int -2147483648~2147483647 unsigned long 和int一样 long 和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
unsigned int 0~4294967295 int -2147483648~2147483647 unsigned long 和 unsigned long long一样 long 和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:
#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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