For/Loop Question

[maddlne]

I'm currently trying to learn on how to work with For/Loops, but I have a problem at the moment. I'm trying to figure out how to add in a list of combinations that add to a certain number, for example;
1 + 3 = 4
2 + 2 = 4
3 + 1 = 4

#include <iostream>
using namespace std;
int main()
{
	for (int i = 1; i < 4; i++)
	{
		for (int k = 1; k < 4; k++)
		{
			cout << i << " + " << k << " = " << i + k << endl;
		}
	}

	return 0;
}

But I can't seem to figure out how to execute the math combinations for that one number, it gives me combinations for every number listed below
1 + 1 = 2
1 + 2 = 3
1 + 3 = 4
2 + 1 = 3
2 + 2 = 4
2 + 3 = 5
3 + 1 = 4
3 + 2 = 5
3 + 3 = 6

I'm aware that adding the second "For" makes the numbers repeat more than once, but I can't think if anything else to work with. Any advice?

[gunnerfunner]

#include <iostream>
using namespace std;
int main()
{
	for (int i = 1; i < 4; i++)
	{
		for (int k = 1; k < 4; k++)
		{
			if(i + k == 4)
            {
                cout << i << " + " << k << " = " << i + k << endl;
            }
        }
    }
}

[maddlne]

Oh, thank you. I appreciate it.