Planet Chili

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#include <conio.h>

void Print(const char* s)
{
	for (; *s != 0; s++)
	{
		_putch(*s);
	}
}

void Read(char* buf, int size)
{
	const char* const end = buf + size - 1;
	for (char c = _getch(); c != 13 && buf < end; buf++, c = _getch())
	{
		_putch(c);
		*buf = c;
	}
	*buf = 0;
}

int Str2Int(const char* s)
{
	int sum = 0;
	for (; *s >= '0' && *s <= '9'; s++)
	{
		sum *= 10;
		sum += *s - '0';
	}
	return sum;
}

void ULongLong2Str(char* s, unsigned long long convert)
{
	if (convert == 0)
	{
		*s = '0';
		s++;
	}
	else
	{
		unsigned long long divisor = 10000000000000000000;
		while (convert / divisor == 0)
		{
			divisor /= 10;
		}
		for (; divisor >= 1; s++, divisor /= 10)
		{
			const char temp = char(convert / divisor);
			*s = temp + '0';
			convert -= temp * divisor;
		}
	}
	*s = 0;
}
unsigned long long Fibonachitor(int n)
{
	unsigned long long last = 0;
	if (n == 0)
	{
		return last;
	}
	unsigned long long cur = 1;
	if (n == 1)
	{
		return cur;
	}
	n--;
	do
	{
		const unsigned long long temp = last + cur;
		last = cur;
		cur = temp;
		n--;
	} while (n > 0);
	return cur;
}

int main()
{
	Print("What positeve fibonachi number do you want? ");
	char writeFibAt[3];
	Read(writeFibAt, sizeof(writeFibAt));
	int fibAt = Str2Int(writeFibAt);
	if (fibAt > 93)
	{
		Print("\nMax value is 93.");
	}
	else
	{
		unsigned long long fibNumber = Fibonachitor(fibAt);
		char fibPrint[21];
		ULongLong2Str(fibPrint, fibNumber);
		Print("\nThe fibonachi number ");
		Print(writeFibAt);
		Print(" is: ");
		Print(fibPrint);
	}

	while (!_kbhit());
	return 0;
}