I'm now trying out for loops with different sized iterations (is that the right word?)

This loop

```
for (int i = 0; i < 5; ++i)
{
for (int j = 0; j < 3; ++j)
{
Console.WriteLine("i = {0} j = {1}", i, j);
}
}
```

outputs

i = 0 j = 0

i = 0 j = 1

i = 0 j = 2

i = 1 j = 0

i = 1 j = 1

i = 1 j = 2

i = 2 j = 0

i = 2 j = 1

i = 2 j = 2

i = 3 j = 0

i = 3 j = 1

i = 3 j = 2

i = 4 j = 0

i = 4 j = 1

i = 4 j = 2

This has repeating pairs of numbers (e.g. i = 0 j = 2 and i = 2 j = 0)

One of the forum members (apegram) suggested a method for non repeating pairs using

```
int maxIndex = 5;
for (int i = 0; i <= maxIndex; i++)
{
for (int j = i; j <= maxIndex; j++)
{
Console.WriteLine("i = {0} j = {1}", i, j);
}
}
```

In this case though maxIndex is no longer the same number. If I use that idiom with my current indices.

```
for (int i = 0; i < 5; ++i)
{
for (int j = i; j < 3; ++j)
{
Console.WriteLine("i = {0} j = {1}", i, j);
}
}
```

The output is

i = 0 j = 0

i = 0 j = 1

i = 0 j = 2

i = 1 j = 1

i = 1 j = 2

i = 2 j = 2

There are no repeating pair of numbers but all the possible pairs of numbers haven't been found.

How is it possible to find all pairs of numbers in this case?

*Edited 6 Years Ago by DaveTran*: n/a