how to make a calculator?

Answer 1

To make an electronic calculator from scratch you need a lot of skills. First you make binary adder for one bit. Then you concatenate those replicated adders to make a binary adder for many bits. Then you represent a binary number in 2 complement form to be able to perform subtraction of binary numbers. Then you use the algorithms to multiply and divide two binary numbers. Then you use algorithms to calculate any function you want your calculator to perform. And finally you use the algorithm to transform decimal numbers into binary for the input and binary to decimal for the output. Present days calculators were 50 years ago the main driving force behind computer building and at that time the biggest human brains (like Von Neumann) worked on it.