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c++ - "long int", "long long" Data Types

What is the purpose of these new data types? I will normally just use an "int" or a "long" but why do these exist? What new function or purpose do they bring?

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long int has always been the full name of long, just rarely used.

long long has been around for a while (in last C standard), and guarantees at least 64bit size (long only guarantees 32bits).


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