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NSUInteger
Used to describe an unsigned integer.
Declaration
OBJECTIVE-C
typedef unsigned long NSUInteger;
Discussion
When building 32-bit applications, NSUInteger is a 32-bit unsigned integer. A 64-bit application treats NSUInteger as a 64-bit unsigned integer
Import Statement
OBJECTIVE-C
@import ObjectiveC;
Availability
Available in iOS 2.0 and later.
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原文地址：http://www.cnblogs.com/afluy/p/5012463.html
