aliraza786
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i use adder ic to make 4 bit subtractor, i wana subtrac 10 from the input value when it is greater then 9, i put the code of 10 at the 4 pins of adder ic and the ther 4 pins is for input bumber i put the carry in bit high but ic didnt show the correct value,my mean subtraction is not correct...pleas see the digram......any help will be highly appriciated..