How to start making this program

I am working on a program that will utilize three arrays to create a 50+ digit number and output that array to a string using a class (LargeInt). The user will input two different numbers and the program will add them together. If the numbers that the user provides equates to a large enough number, the program will make a third array. I am not sure of how to start. Any suggestions?
Do you have to use arrays to do what you are wanting? Im confused as why you require the use of three arrays to make a 50 digit number, can you elaborate on this?
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