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 nanochan1 27Oct2010 17:00

Code:

```string addArray (int* a1, int* a2, int size1, int size2) {     string answer;     int* big, *small;     int temp, end1, end2;     bool upNext = false;         if (size1 > size2)     {         end1 = size1;         end2 = size2;         big = a1;         small = a2;         }     else     {         end1 = size2;         end2 = size1;         big = a2;         small = a1;     }                 for (int i = 0; i < end1; i++)     {         temp = 0;                 if (upNext == true)         {             temp += 1;             upNext = false;         }                 if(i < end2)         {                temp += *big + *small;                                     big++;             small++;         }         else         {             temp += *big;                     big++;         }                 if((temp-10) >= 0)         {             temp -= 10;             upNext = true;         }                     answer += static_cast<char>((temp + 48));     }     if (upNext == true)         answer += static_cast<char>(49);                 return answer; }```
how to change it to become subtraction? any idea?

 xpi0t0s 28Oct2010 11:45

Not sure, could it be to change
Code:

`temp += *big + *small;`
to
Code:

`temp += *big - *small;`
?

But it really depends which addition you want to change to subtraction, which you haven't said. What does the current code do, and what do you want the modified code to do, with examples?

 nanochan1 28Oct2010 19:43

Quote:
 Originally Posted by xpi0t0s (Post 74168) Not sure, could it be to change Code: `temp += *big + *small;` to Code: `temp += *big - *small;` ? But it really depends which addition you want to change to subtraction, which you haven't said. What does the current code do, and what do you want the modified code to do, with examples?
thanks..

i've tried that but it merely works for single digit integers..

it doesn't bring over from the neighbour for the subtraction, any advise?

eg,

Code:

```input1: 9 input2: 8 output: 1```
but when i attempted to do this

Code:

```input1: 10 input2: 9 output: 09  (answer should be 1)```
and

Code:

```input1: 8 input2: 9 output: /  (answer should be -1)```

 nanochan1 28Oct2010 19:46

the subtraction should behind like the examples given above.

currently, my codes above can do addition with no issues.

eg. (for the above addition code that i've done)

Code:

```input1: 10 input2: 9 output: 19```
Code:

```input1: 99 input2: 101 output: 200```
Code:

```input1: 1 input2: 9 output: 10```
the addition part that i've done are all correct.

 nanochan1 28Oct2010 19:49

and if possible i would prefer the subtraction part when i tried to do subtraction it output in this manner:

Code:

```input1: 000 input2: 000 output: 000 (it should automatically become one 0 instead of three 0s isn't it?)```
Code:

```input1: 0005 input2: 0005 output: 0000 (it should automatically become one 0 instead of three 0s isn't it?)```

appreciate all assistance render.

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