Input is 8 logic source below the 7 segment display. U should give input in binary!! Top 4 is for first digit and bottom 4 are for 2nd digit, After pushing the push button the display shows the entered number!.. ( if binary value is more than 9 then it will be considered as 0 ) then wait for delay time ! Then u get the sum of the 2 no u entered in other 2 displays!!! (( takes little time for getting answer))!!!! It really takes time !! Don't judge early!!!
