A GetPass function problem

For some reason, if you press basckspace a bunch of times, and then press "d" like 4 times, it wont return anything. Anyone know why?

#include <iostream.h>
#include <conio.h>
#include <stdio.h>

void GetPass(char *input, int length)
{
	char temp;
	for(int i = 0; i < length; i++)
	{
		temp = getch();
		if(temp == 13)
		{
			input[ i ] = 0;
			break;
		}

		if(i > 0)
		{
			if(temp == 8)
			{
				putchar(8);
				putchar(' ');
				putchar(8);
				input[--i] = 0;
				i = i - 1;
			}
		}

		if(temp != 8)
		{
			putchar('*');
			input[ i ] = temp;
		}
	}
}

void main()
{
	char input[100];
	GetPass(input, 100);
	cout<<endl;
	cout<<input;
	return;
}