Objective-C app #2

gistfile1.m

// Implement a Calculator class

#import <Foundation/Foundation.h>

@interface Calculator : NSObject

// accumulator methods
-(void) setAccumulator: (double) value;
-(void) clear;
-(double) accumulator;

// arithmetic methods
-(void) add: (double) value;
-(void) subtract: (double) value;
-(void) multiply: (double) value;
-(void) divide: (double) value;

@end

@implementation Calculator {
    double accumulator;
}

-(void) setAccumulator:(double)value {
    accumulator = value;
}

-(void) clear {
    accumulator = 0;
}

-(double) accumulator {
    return accumulator;
}

-(void) add:(double)value {
    accumulator += value;
}

-(void) subtract:(double)value {
    accumulator -= value;
}

-(void) multiply:(double)value {
    accumulator *= value;
}

-(void) divide:(double)value {
    accumulator /= value;
}

@end

int main(int argc, const char * argv[])
{

    @autoreleasepool {
        
        Calculator *calc = [[Calculator alloc] init];
        
        [calc setAccumulator: 100.0];
        [calc add: 200];
        [calc divide: 15];
        [calc subtract: 10];
        [calc multiply: 5];
        
        NSLog(@"The result is: %g", [calc accumulator]);
        
    }
    
    return 0;

}