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|long long|8|-100, 0xff|
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NSArray arFriends;
arFriends = [NSArray arrayWithObjects:"Tom", @"Cindy", @...
for (NSString* strName in arFriends) {
// strName¤òÍѤ¤¤¿½èÍý
}
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NSString* str;
str = @"hello world";
int iLength;
iLength = [str length];
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NSString* str;
str = @"hello world";
unichar uc;
uc = [str characterAtIndex:0];
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NSString* str;
str = @"hello world";
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range = [str rangeOfString:str
options:NSCaseInsensitiveSearch];
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