| http://www.w3.org/ns/prov#value | - Your comments are always appreciated. ... and yes, these data types are making my head spin too. //chapter 4, exercise 8//#import <Foundation/Foundation.h>@interface Calculator: NSObject// accumulator methods-(void) setAccumulator: (double)value;-(void) clear;-(double) accumulator;// arithmetic methods-(double) add: (double) value;-(double) subtract: (double) value;-(double) multiple: (double) val
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