#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <ctype.h>
#include <math.h>
#include <iostream>
#import "DDMathParser.h"
#import "NSString+DDMathParsing.h"
#import <Cocoa/Cocoa.h>
#import <Foundation/Foundation.h>

int main(int argc, char * argv[])
{
    NSLog(@"%@", [@"5 + 5" numberByEvaluatingString]);
}

2015-08-29 09:23:09.788 calculator[6212:101522] -[__NSCFConstantString            numberByEvaluatingString]: unrecognized selector sent to instance 0x100001060
2015-08-29 09:23:09.792 calculator[6212:101522] *** Terminating app due to     uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFConstantString    numberByEvaluatingString]: unrecognized selector sent to instance 0x100001060'
*** First throw call stack:
(
    0   CoreFoundation                      0x00007fff9365d03c   __exceptionPreprocess + 172
    1   libobjc.A.dylib                     0x00007fff8fddd76e   objc_exception_throw + 43
    2   CoreFoundation                      0x00007fff936600ad -  [NSObject(NSObject) doesNotRecognizeSelector:] + 205
    3   CoreFoundation                      0x00007fff935a5e24   ___forwarding___ + 1028
    4   CoreFoundation                      0x00007fff935a5998   _CF_forwarding_prep_0 + 120
    5   calculator                          0x0000000100000e86 main + 38
    6   libdyld.dylib                       0x00007fff864595c9 start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)