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How to Handle Numbers Larger Than `long long int`?

Patricia Arquette

Nov 21, 2024 am 03:11 AM

How to Handle Numbers Larger Than `long long int`?

What's the Best Variable Type for Handling Numbers Beyond Long Long Int?

While long long int is a powerful data type for handling large integers, it falls short when dealing with values as massive as 3141592653589793238462643383279502884197169399375, which can extend up to 10^80. For such extreme numerical values, standard integer types simply aren't equipped to handle them.

The solution lies in utilizing specialized libraries designed for "bignum" (multiple precision integer) operations. Two notable options for C developers are Boost.Multiprecision and GNU MP.

Boost.Multiprecision provides a C interface for handling large integers, but be mindful of its potential complexities and potential DLL issues.

GNU MP offers a proven and reliable C interface for bignum operations. It is fast, well-maintained, and widely used, making it a highly suitable option.

It's crucial to note that using a bignum library does not automatically guarantee security when implementing cryptographic primitives like RSA. Utilizing a robust cryptocurrency library, such as Botan, is essential for ensuring the integrity of your cryptographic operations.

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