Question

How to find the sum of all the primes below 10000 (ten thousand) in Swift

Answer 1

import Foundation

func isPrime(_ n: Int) -> Bool {
    if n < 2 || (n % 2 == 0 && n != 2) { return false }

    let limit = Int(Double(n).squareRoot())
    for i in stride(from: 3, through: limit, by: 2) {
        if n % i == 0 { return false }
    }

    return true
}

func main() {
    let num = 10000
    var sum = 0

    for i in 2..<num {
        if isPrime(i) {
            sum += i
        }
    }

    print("sum = \(sum)")
}

main()



/*
run:

sum = 5736396

*/

 

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