What does 1024LL mean in C [duplicate]

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LL is a suffix that means long long. In that particular snippet of code, the writer is saying one of the terms is 1024 but stored in a long long way. C has a rule that says the largest bits of any of the terms will be what it uses when it resolves integer math. Without the LL, then, 1024 * 1024 * 1024 would just overflow.

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