CareerCup

int[] number =
		{ 8, 9, 9, 9, 9, 9, 9, 9, 9 };
		int length = number.length;
		boolean done = false;
		for (int i = length - 1; i >= 0; i--)
		{
			if (number[i] == 9)
			{
				number[i] = 0;
			}
			else
			{
				number[i] = number[i] + 1;
				done = true;
				break;
			}
		}
		if (!done)
		{
			int[] a = new int[length + 1];
			System.arraycopy(number, 0, a, 1, length);
			a[0] = 1;
			number = a;
		}

This is the first time I've seen an acronym for "write a code". It's particularly interesting because "write a code" is grammatically incorrect: it should be "write code". I generally hear a lot of people from India talk about "writing a code". Any particular reason this is so? Is that what they call it in schools?

To a native English speaker, this expression actually sounds funny because in that context, "code" generally means something like a combination to open a lock or a bar code at a store. You want me to write a code? Okay: 33728930...

It's unlike me to make a post which is admittedly off-topic, but when I read the question, I just thought that since many people here are from India, I'd probably be doing someone a service by pointing out that in interviews and cover letters and everything else (at least in the US), it's "write code", not "write a code". Don't tell the guy interviewing you that your summer job involved "writing a code to allow users to access a website" (sounds like the website has a backdoor), or worse, "writing a code for encryption purposes" (sounds like you're designing an encoding scheme of some kind).

def increment_array(a):
  for i in xrange(len(a) - 1, 0, -1):
    if a[i] < 9:
      a[i] += 1
      return a
    else:
      a[i] = 0
  return [1] + [0] * len(a)

Assume we have positive value.

Arr = input and output array pointer,
n = input and output array length.

void IncreaseArray(int*& Arr, int& n)
{
	int Index;
	bool bQuit=false;

	// start from the end backwards to the beginning:

	for(Index=n-1;Index>0;Index--)
	{
		if(Arr[Index]<9)
		{
			Arr[Index]++; // we just increase the value and quit
			bQuit=true;
			break;
		}
		else // i.e. the digit == 9
		{
			Arr[Index]=0; // thanser to the next digit
		}
	} // now we are at index "0", if we went through all loop

	if(bQuit==true) return;

	// special case: the very first digit:

	if(Arr[Index]<9)
	{
		Arr[Index]++;
		return;
	}

	// if the array was "9999", we need to make it "10000":

	Arr[Index]=0;
	int* Arr2;
	Arr2 = new int[n+1];
	Arr2[0] = 1;
	memcpy(&Arr2[1], &Arr[0], n*sizeof(int));
	delete [] Arr; // actually, we should not do that, as Arr can be a pointer to a STATIC array!
	Arr = Arr2;
	n++;
}

+ve no-
while(a[i]==9)
{a[i]=0;
i--;}
if(a[i]!=9)
a[i]+=1;
-ve no
while(a[i]==0)
{a[i]=9;
i--;}
if(a[i]!=0)
a[i]-=1}

+ve no-
while(a[i]==9)
{a[i]=0;
i--;}
if(a[i]!=9)
a[i]+=1;
-ve no
while(a[i]==0)
{a[i]=9;
i--;}
if(a[i]!=0)
a[i]-=1}