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Java int addition  the long way 
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#1
Oct509, 02:47 AM

P: 4

Hi guys,
I'm trying to figure out a way to split up integers so I can do addition the old school way in Java. E.g.: 1234 1234 +_____ 2468 So you know start at the 4's and then add them up and move left etc. Does anyone have any ideas on how I access the different digits of an int? Thanks 


#2
Oct509, 03:27 AM

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P: 4,300

I don't know if there is some nice routine for this, but there is always the oldfashioned dirty way: to access the 10^{n} digit (i.e. for n = 0 you get the units, for n = 1 the tens, etc) you can integerdivide by 10^{n} and then take the result modulo 10.
For example: 1234 / 100 = 12 (as integer division produces an integer by chopping off the decimal part) 12 % 10 = 2 


#3
Oct509, 03:36 AM

P: 4

Ah that does sound like a good way of doing it.
Can it work the same if the base is not 10? 


#4
Oct509, 05:51 AM

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HW Helper
P: 4,300

Java int addition  the long way
I suppose in base b, one can still obtain the digits at the nth position (starting from n = 0 on the right) of a number N as
[tex]\operatorname{digit}_n(N) = \left[ N / b^n \right] \text{ mod } b [/tex] where the square brackets denote the floor of the division. 


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