Swift runs on Windows!

swift/.playground/prime.swift

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+let lastNumber = 1000
+
+print("We calcuate the prime numbers until", terminator: " ")
+print(lastNumber)
+
+print("2 3 5 7 11", terminator:" ")
+
+for number in 13 ... lastNumber {
+    let upperBound = Int(Double(number).squareRoot())
+    var isPrime = 1
+    for divisor in 2 ... upperBound {
+        let quotient = Double(Double(number) / Double(divisor))
+        let rest = quotient - Double(Int(quotient))
+        //print(number, divisor, rest)
+        if rest == 0 {
+            isPrime = 0
+            break
+        }
+    }
+    if isPrime == 1 {
+        print(number, terminator:" ")
+    }
+}

swift/PrimeSwift/.gitignore

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+.DS_Store
+/.build
+/Packages
+xcuserdata/
+DerivedData/
+.swiftpm/configuration/registries.json
+.swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
+.netrc

swift/PrimeSwift/Package.swift

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+// swift-tools-version: 5.9
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "PrimeSwift",
+    targets: [
+        // Targets are the basic building blocks of a package, defining a module or a test suite.
+        // Targets can depend on other targets in this package and products from dependencies.
+        .executableTarget(
+            name: "PrimeSwift"),
+    ]
+)

swift/PrimeSwift/Sources/main.swift

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+// The Swift Programming Language
+// https://docs.swift.org/swift-book
+
+let lastNumber = 1000000
+var count = 4 // start from 11, know 2, 3, 5, 7
+var prime = true
+let clock = ContinuousClock()
+let result = clock.measure {
+    print("We calcuate the prime numbers until", lastNumber, "\n")
+    // print("\n2 3 5 7", terminator:" ") // because upper limit divisor
+    for number in stride(from: 11, through: lastNumber, by: 2) {
+        prime = true
+        for divisor in stride(from: 3, through: Int(Double(number).squareRoot()), by: 2) { 
+            if number % divisor == 0 {
+                prime = false
+                break
+            }
+        }
+        if prime {
+            count += 1
+        }
+    }
+}
+// var stopTime = NSDate()
+// var interval = stopTime.timeIntervalSince(startTime as Date)
+print("This calculation took", result,"seconds.")
+print("I found", count, "prime numbers.")