Labeling Jagged Arrays

[Cant Think Today]

I have multi-dimesional arrays that can be specifed by the user, e.g

1,2,3,4,5
1,2,3,4,5,6,7,8,9,10
1,2,3,4,5,6

I think a bit of code that will iterate over these arrays to print out
the element indices for each unique element in the N-dimensional
array. E.g. for the above

1:1:1
1:1:2
1:1:3
1:1:4

So what is the loop with the printf that will print the line to std???
This is probably simple as hell but its late and I can't think!!