Calculator buttons using flip-flips to store numbers as binary?

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chrisalviola
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Is it possible to use flip-flips to store numbers inputted, for example if i input 5, current will go to 4x nand flip flip and store 0101 and the next digit to be calculated, any ideas on this?
 
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I want to use it like a calculator, when you press 0 to 9 button 4 bits will be stored in 4x nand flipflops
 
What you want to make is not clear. I guess you want to design a simple microprocessor. In that case read a digital elec book like mano.