objective c - SIGABRT error puzzling me -

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i new objective-c. previous programming experience visual basic. yes, noob. intuitive , these sorts of things, determined learn. decided after learning basic create calculator program scratch without looking @ how it, , learn experience. got addition, , worked beautifully. however, after added subtraction , multiplication. it, blunt, took shit. after running, crashes , brings me untouched main.m file sigabrt error. have no idea went wrong. code looks should work me, despite organizational errors. tried commenting out added, no avail. still gives me error. appreciated thank you. below pictures of code:

.h file: http://i73.photobucket.com/albums/i206/strbarrytree/screenshot2011-07-21at42338am.png

.m file: http://i73.photobucket.com/albums/i206/strbarrytree/mycode.jpg

you have connected outlet or action in ib , deleted outlet/action in header file. check in ib if have connection "!" next , delete it.


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