Fibonacci Stuck on Infinite loop

[Ace70]

I'm trying to get this program to display the fibonacci sequence to the any digit between 3 & 30. It is stuck on an infinite loop.

here is the code I wrote:

#include <iostream>
using namespace std;

int main()
{
int num = 0;
int a = 0;
int b = 1;
int count = 0;
cout << "How many numbers do you want to run through? (3 min, 20 max) ";
cin >> num;
while ( num >= 3 && num <=20 )
{
b = a + b;
a = b - a;
b = a + b - a;
cout << b;
count = 10;
count++;
}
system ("pause");
return 0;
}

[b1gb0y2013]

int main()
{
int num = 0;
int a = 0;
int b = 1;
int count = 0;
cout << "How many numbers do you want to run through? (3 min, 20 max) ";
cin >> num;
if(num >= 3 && num <= 20)
{
while (num > 0)
{
b = a + b;
a = b - a;
b = a + b - a;
cout << b;
count = 10;
count++;
num--;
}
}
system ("pause");
return 0;
}

[Ace70]

I never thought of using a loop. But thanks a ton. It works perfectly. I'm new to C++ but how did you know to use the If ?

[TheNoobie]

I'm so confused about this bit...

count = 10;
count++;

Your assigning 10 to count every time it goes through the loop, then adding 1 so that it is 11. So every time this loop goes through, count is the exact same.. I don't understand the point? I also don't see where count is even used, but I imagine this isn't your full code (even though it looks like it.)

[b1gb0y2013]

As TheNoobie said, Im not so sure about that either. Especially that you have int count = 0 outside the loop not used, and then make it 10 without even using it.

[Ace70]

I really don't get it either. But it works. Maybe the int count = 0 is ignored because I changed it to 10 inside the loop.

[ascii]

generally in programming its not good to say "i dont understand it but it works" because its hard to get better that way :o
anyhow heres my code.

#include <iostream>
using std::cout;
using std::endl;
using std::cin;

int main(void)
{	
	int length;
	cout << "How many numbers would you like to print out? ";
	cin >> length;
	int* sequence;
	sequence = new int[length];
	sequence[0] = 1;
	sequence[1] = 2;
	for (int i = 2; length > 0; length--, i++)
	{
		sequence[i] = sequence[i - 1] + sequence[i - 2];
		cout << sequence[i] << endl;
	}

	delete [] sequence;
	sequence = 0;
	return 0;
}