increase decrease

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#include <iostream>
using namespace std;
int increase(int src, int range)
{
	return (src + 1) % range;
}
int decrease(int src, int range)
{
	return (src - 1 + range) % range;
}
int main(int argc, char *argv[])
{
	int n = 0;
	for(int i=0; i<20; i++)
	{
		n = increase(n, 4);
		cout<<n<<" ";
	}
	n = 0;
	cout<<endl;
	for(int i=0; i<20; i++)
	{
		n = decrease(n, 4);
		cout<<n<<" ";
	}
	
	return 0;
}