Prime Number in Swift

Welcome to the Prime Number in Swift page! Here, you'll find the source code for this program as well as a description of how the program works.

Current Solution

import Foundation

let usage = "Usage: please input a non-negative integer"

if CommandLine.arguments.count != 2 {
    print(usage)
    exit(0)
}

guard let number = Int(CommandLine.arguments[1]), number >= 0 else {
    print(usage)
    exit(0)
}

if number < 2 {
    print("composite")
    exit(0)
}

var isPrime = true
let limit = Int(Double(number).squareRoot())

if limit >= 2 {
    for i in 2...limit {
        if number % i == 0 {
            isPrime = false
            break
        }
    }
}

print(isPrime ? "prime" : "composite")

Prime Number in Swift was written by:

• Vidish Kumar

If you see anything you'd like to change or update, please consider contributing.

How to Implement the Solution

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How to Run the Solution

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