Strictly speaking you can store a 100 digit number as a string. Whether this is any use is another matter. If you have a suitable compiler then the max of long long is 2^64 otherwise you are down to writing your own store and handling.
If you're really doing maths to 100 decimal place prcision then you must be doing something unusual.
Columb: banking in a country with a bad inflation problem??!!
Lisalis99: if you can avoid it, don't even think about doing maths on a number stored as a string. It's easy to code but it'd run like thick treacle on a cold day.
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