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  • jiaxin hu thinks this is interesting:

Multiply the two fractions and add the exponents, (1.2 x 1.1 = 1.32) (-1 + 1 = 0):

+1.2000E-1	The number is 0.12.
+1.1000E+1	The number is 11.0.
+1.3200E+0	The result is 1.32.


Cover of Practical C Programming, 3rd Edition


seems the author regard the multiply for digit fraction as trivial process, but i still can understand how to multiply on physical machine.