I have been constructing an assembly program based on accepted single characters integers, and converting them into the numerical Hex value. I was curious how scanf() transforms single characters into their integer equivalent from input. I know you can convert by subtracting base value (ascii Hex value of 0 ). Beside using the multiplication method ( seems too slow), is there any other method to combine the single integers?
Last edited by Darkinyuasha1; 04-03-2010 at 09:13 PM.
scanf (and your program, or anything else) receives them as hex values in the first place. When I push 'a' on my keyboard, the keyboard sends 97 to the computer, which is what it gets.
If you mean how does "487" get turned into the number 487, you can get a little fancy (if ASCII) in that the low three bits of a numeric character are that value, BUT you can't multiply by 10 just by shifting. (You can do some shifts and an add, of course.)
so what would be a better method to turn for example "200" in ascii to the numerical value 200?
better than scanf?Originally Posted by Darkinyuasha1
strtol
All problems in computer science can be solved by another level of indirection,
except for the problem of too many layers of indirection.
– David J. Wheeler
