Question

How to define an exabyte constant in Swift

Answer 1

/*
    Swift's UInt64 type is an unsigned 64‑bit integer.
    Maximum value: 18_446_744_073_709_551_615  (~1.84 × 10^19)

    Exabyte sizes:

        1 EiB = 2^60  = 1_152_921_504_606_846_976 bytes
        1 EB  = 10^18 = 1_000_000_000_000_000_000 bytes

    Both values fit safely inside UInt64.
*/

// Binary exabyte (exbibyte), using a bit shift.
// 1 << 60 = 2^60 bytes.
let EXABYTE_EIB: UInt64 = 1 << 60

// Decimal exabyte (SI), using a readable numeric literal.
let EXABYTE_EB: UInt64 = 1_000_000_000_000_000_000

print("1 EiB = \(EXABYTE_EIB) bytes")
print("1 EB  = \(EXABYTE_EB) bytes")



/*
run:

1 EiB = 1152921504606846976 bytes
1 EB  = 1000000000000000000 bytes

*/

 

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