asked on

Add and Subtract Elements of two arrays

I don't know how easy or hard this is, but I am so confused and cannot think of it.

I have two arrays in reverse order.

So basically

Array a[]=321 ( ie the number is 123)
Array b[] = 9001 (i.e the number is 1009)

I want Array a[] + Array b[] (means 123 + 1009) = 1132

So I have to make a add method which accepts these two arrays as arguments.

Then I add those two numbers and return the value in string or an array, doesn't matter.

How do I do add and subtract method for this problem. As I have to make sure about the carry digit as if we add 9 and 3 its 12, so 1 is carry or so.

I hope you guys/gals understand my problem and if you have any questions then please let me know

Thanks in advance

CEHJ

You mean you want to return 1132?

CEHJ

Sorry - must be getting tired - i see you do ;-)

SOLUTION

CEHJ

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CEHJ

Of course you could arrange things so that you only need one loop, called twice

ASKER CERTIFIED SOLUTION

Webstorm

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Webstorm

unsigned substraction (a must be >= b) :

int[] substract(int[] a,int[] b)
{
int ml=(b.length>a.length)?b.length:a.length; // maximum array length
int[] res=new int[ml];
int c=0; // carry
for (int i=0;i<res.length;i++)
{
res[i]=digit(a,i)-digit(b,i)-c+10; // +10 for %
c=1-(res[i]/10);
res[i]%=10;
}
return res;
}

CEHJ

>>If you mean array of integer value :

The code i already posted will work with an array of int or String

Guru Ji

ASKER

Yes I tried everything

@CEHJ your code works great... Thanks

@Webstorm - Your code is great too, I will use it for subtraction

Will assign points when I will be done

Thanks to everyone

CEHJ

8-)