Recursive Function

[Aden8]

I'm practicing writing my own functions, recursive functions to be exact. My goal is to have it count up to a number, and then back down (a number the user inputs). It's required I have the function inside as well.

This is what I have so far. I expect it to display as...
input:4

1
2
3
4
4
3
2
1

But instead I get...
input:4

4
3
2
1
1
2
3
4

Here is my code. Please help. Thanks in advance.

#include <iostream>
using namespace std;
int display(double number);

int main()
{
	double number, calls;

	do{
		cout << "Enter number ";
		cin >> number;
		cout << endl;

		calls = display(number);

		cout << endl;


	} while (1);

	system("pause");
	return 0;
}

int display (double number)
{

	int calls;

	cout <<  number << endl;

	if(number == 1)
		calls = 1;
	else
		calls = display(number-1);

	cout  << number << endl;






	return calls;

}

[Erik Koomen]

what your program does now is that it starts at 4(since that is the first input), and it keeps subtracting 1 until it has reached one.

if you want your desired output, then you should keep adding one, until it's 4.
you could do it this way

int display (double max, double start)
{
int calls;
cout<<start<<endl;

if(start == max)
calls = max;
else
calls = display(max, start+1);

cout<<start<<endl;
return calls;
}

I haven't tested the code myself, but I think it might work.
start is the number with what it should begin (in your case: 1).

[Aden8]

That works. Thank you!