“Program received signal ”SIGABRT" when building a calculator?

From the exception above, it seems that your IBActions are not properly connected. As dasdom mentioned, delete all your buttons, create new buttons and then add IBAction methods accordingly.

From the exception above, it seems that your IBActions are not properly connected. As dasdom mentioned, delete all your buttons, create new buttons and then add IBAction methods accordingly. Also one more thing I recognized in your code, in the multiply and divide methods there is a memory leak.

You have written resultLabel. Text = NSString alloc initWithFormat:@"%2. F" , a*b; it should be resultLabel.

Text = NSString alloc initWithFormat:@"%2. F" , a*bautorelease; or resultLabel. Text = NSString StringWithFormat:@"%2.

F" , a*b; and do a similar change in divide method also. To what did you link your backgroundtap method?

It seems that you buttons aren't buttons. They seem to be view. Delete the buttons from you nib and put new buttons there and link them you our IBActions.

If they are in fact buttons, change their class in IB through the third inspector (Command-Option-3) – Inspire48 Aug 20 at 12:17 I've check the Identity Inspector. Each of the button belongs to the "UIButton" Class. – lavitanien Aug 20 at 12:19 How did you set the connection.

Control click on the button an then drag a line into the . H file? – dasdom Aug 20 at 12:21 Click on the button.

Ctrl-click on "Touch up inside" and drag a line onto File's Owner and choose the method. – lavitanien Aug 20 at 12:26.

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