How does a computer do single-precision 32-bit floating-point addition and subtraction

Questions

So every number in a computer is represented by binary numbers. I want to know how a computer does binary addition/subtraction of single-precision 32-bit floating-point numbers, especially when two numbers have different exponents.

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http://stackoverflow.com/questions/25669024/how-does-a-computer-do-single-precision-32-bit-floating-point-addition-and-subtr

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