Why is xcode ignoring a NSLog statement placed in sum definition?

#import <Foundation/Foundation.h>  

// interface  
@interface Calculator: NSObject  

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

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

//memory methods  
-(double) memoryClear;                  // clear memory  
-(double) memoryStore;                  // set memory to accumulator accu <= memory  
-(double) memoryRecall;                 // retrive memory from accumulator memory <= accu  
-(double) memoryAdd: (double) value;    // add value into memory  
-(double) memorySubtract: (double) value; // subtract value from memory   

@end  

//implementation  
@implementation Calculator  
{  
    double accumulator, memory;  
}  

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

-(void) clear;  
{  
    accumulator = 0;  
}  

-(double) accumulator  
{  
    return accumulator;  
}  

-(double) add:(double)n        
{  

    accumulator += n;  
    return accumulator;  
    NSLog(@"The sum of %g and %g is %g", accumulator, n, accumulator+n); 
}  

-(double) subtract:(double)n  
{  
    accumulator -=n;  
    return accumulator;  
}  

-(double) divide: (double) n  
{  
    accumulator /=n;  
    return accumulator;  
}  

-(double) multiply: (double) n  
{  
    accumulator *=n;  
    return accumulator;  
}  

-(double) memoryClear  
{  
    memory = 0;  
    return memory;   
}  
@end  

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

    @autoreleasepool {  
        Calculator *myCalc = [[Calculator alloc] init];  
        [myCalc setAccumulator:100];  
        [myCalc add:30];  
        [myCalc subtract:30];  
        [myCalc divide:2];  
        [myCalc multiply:3];  
        NSLog(@"Hello, World! %g", [myCalc accumulator]);  


    }  
    return 0;  
}