Combining two studies but there is only one function main()

[WantToLearn]

I want to combine two efs programs, customVolume.efs and ATR.efs. Everything appears to be good except for the function main(), they require two different inputs.

CustomVolume.efs has function main(Length) and
ATR.efs has function main(nInputPeriod).

How can I combine both programs in function main()? Or do I just make a separate function under function main() to take care of the ATR.efs?

Any help would be greatly appreciated.

[WantToLearn]

I found the answer, I think.

I put in the program function main(Length, nInputPeriod)

At least no errors came up. I am checking it further.