i had the same problem a couple of days ago one solution is to flag the number of keypad hits then after every flag perform an operation i used flags from 1 to 4 then save the keypad hits in 4 variables then do an operation each and every flags!!! for example to solve a digit or two flag1 which is keypad hit number one = hit1, flag2= (hit1*10)+hit2 then flag3=(hit1*100)+(hit2*10)+hit3............and so on and so forth
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