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。

- (IBAction)inputNumber1:(id)sender {

    NSInteger num1 = 1;
    NSString *print = [[NSString alloc] initWithFormat:@"%ld!", (long)num1];
    self->kekka.text= print;

}

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  計算home                          0x0000000100fc7baf main + 111
    20  libdyld.dylib                       0x000000010422f92d start + 1
    21  ???                                 0x0000000000000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)