計算機がクラッシュ

計算機を作ってみたのですが、ボタンを押すとクラッシュしてしまいます。原因、改善方法を教えてください。

Obhective
1
2- (IBAction)inputNumber1:(id)sender {
3    
4    NSInteger num1 = 1;
5    NSString *print = [[NSString alloc] initWithFormat:@"%ld!", (long)num1];
6    self->kekka.text= print;
7    
8}

2016-04-29 16:33:45.296 計算home[5159:954504] -[ViewController calcBmi]: unrecognized selector sent to instance 0x7fcf71473ea0
2016-04-29 16:33:45.686 計算home[5159:954504] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[ViewController calcBmi]: unrecognized selector sent to instance 0x7fcf71473ea0'
*** First throw call stack:
(
	0   CoreFoundation                      0x0000000101a55d85 __exceptionPreprocess + 165
	1   libobjc.A.dylib                     0x00000001014c9deb objc_exception_throw + 48
	2   CoreFoundation                      0x0000000101a5ed3d -[NSObject(NSObject) doesNotRecognizeSelector:] + 205
	3   CoreFoundation                      0x00000001019a4cfa ___forwarding___ + 970
	4   CoreFoundation                      0x00000001019a48a8 _CF_forwarding_prep_0 + 120
	5   UIKit                               0x0000000101e0da8d -[UIApplication sendAction:to:from:forEvent:] + 92
	6   UIKit                               0x0000000101f80e67 -[UIControl sendAction:to:forEvent:] + 67
	7   UIKit                               0x0000000101f81143 -[UIControl _sendActionsForEvents:withEvent:] + 327
	8   UIKit                               0x0000000101f80263 -[UIControl touchesEnded:withEvent:] + 601
	9   UIKit                               0x0000000101e8099f -[UIWindow _sendTouchesForEvent:] + 835
	10  UIKit                               0x0000000101e816d4 -[UIWindow sendEvent:] + 865
	11  UIKit                               0x0000000101e2cdc6 -[UIApplication sendEvent:] + 263
	12  UIKit                               0x0000000101e06553 _UIApplicationHandleEventQueue + 6660
	13  CoreFoundation                      0x000000010197b301 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
	14  CoreFoundation                      0x000000010197122c __CFRunLoopDoSources0 + 556
	15  CoreFoundation                      0x00000001019706e3 __CFRunLoopRun + 867
	16  CoreFoundation                      0x00000001019700f8 CFRunLoopRunSpecific + 488
	17  GraphicsServices                    0x00000001052d5ad2 GSEventRunModal + 161
	18  UIKit                               0x0000000101e0bf09 UIApplicationMain + 171
	19  Ë®àÁÆóhome                          0x0000000100fc7baf main + 111
	20  libdyld.dylib                       0x000000010422f92d start + 1
	21  ???                                 0x0000000000000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)