Question

How to define a terabyte 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)

    Terabyte sizes:

        1 TiB = 2^40  = 1,099,511,627,776 bytes
        1 TB  = 10^12 = 1,000,000,000,000 bytes

    Both values fit safely inside UInt64.
*/

// Binary terabyte (tebibyte), using a bit shift.
// 1 << 40 = 2^40 bytes.
let TERABYTE_TIB: UInt64 = 1 << 40

// Decimal terabyte (SI), using a readable numeric literal.
let TERABYTE_TB: UInt64 = 1_000_000_000_000

print("1 TiB = \(TERABYTE_TIB) bytes")
print("1 TB  = \(TERABYTE_TB) bytes")



/*
run:

1 TiB = 1099511627776 bytes
1 TB  = 1000000000000 bytes

*/

 

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