I can't understand what the question really means.

Question

"in columns i through j", did it mean that it has i columns and j row? Please help me. Thanks a lot!

Answer 1

I'm not good at English though, usually i and j in the loop is like

j0 j1 j2 j3
i0
i1
i2
i3
i4
i5

And the code will be
for(int i = 0 ; i < 6 ; ++i)
{
for(int j = 0 ; j < 4 ; ++j)
{
//some code...
}
}

Answer 2

CarrieForle I think so, thank you!
I am just confused by expression of the homework.